1. 14 7月, 2008 1 次提交
    • D
      drm: reorganise drm tree to be more future proof. · c0e09200
      Dave Airlie 提交于
      With the coming of kernel based modesetting and the memory manager stuff,
      the everything in one directory approach was getting very ugly and
      starting to be unmanageable.
      
      This restructures the drm along the lines of other kernel components.
      
      It creates a drivers/gpu/drm directory and moves the hw drivers into
      subdirectores. It moves the includes into an include/drm, and
      sets up the unifdef for the userspace headers we should be exporting.
      Signed-off-by: NDave Airlie <airlied@redhat.com>
      c0e09200
  2. 30 4月, 2008 1 次提交
  3. 10 2月, 2008 1 次提交
  4. 06 2月, 2008 1 次提交
    • D
      gpiolib: add drivers/gpio directory · a9c5fff5
      David Brownell 提交于
      Add an empty drivers/gpio directory for gpiolib infrastructure and GPIO
      expanders.  It will be populated by later patches.
      
      This won't be the only place to hold such gpio_chip code.  Many external chips
      add a few GPIOs as secondary functionality (such as MFD drivers) and platform
      code frequently needs to closely integrate GPIO and IRQ support.
      
      This is placed *early* in the build/link sequence since it's common for other
      drivers to depend on GPIOs to do their work, so they must be initialized early
      in the device_initcall() sequence.
      Signed-off-by: NDavid Brownell <dbrownell@users.sourceforge.net>
      Acked-by: NJean Delvare <khali@linux-fr.org>
      Cc: Eric Miao <eric.miao@marvell.com>
      Cc: Sam Ravnborg <sam@ravnborg.org>
      Cc: Haavard Skinnemoen <hskinnemoen@atmel.com>
      Cc: Philipp Zabel <philipp.zabel@gmail.com>
      Cc: Russell King <rmk@arm.linux.org.uk>
      Cc: Ben Gardner <bgardner@wabtec.com>
      Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
      a9c5fff5
  5. 02 2月, 2008 1 次提交
  6. 31 1月, 2008 1 次提交
  7. 30 1月, 2008 2 次提交
    • B
      x86: early boot debugging via FireWire (ohci1394_dma=early) · f212ec4b
      Bernhard Kaindl 提交于
      This patch adds a new configuration option, which adds support for a new
      early_param which gets checked in arch/x86/kernel/setup_{32,64}.c:setup_arch()
      to decide wether OHCI-1394 FireWire controllers should be initialized and
      enabled for physical DMA access to allow remote debugging of early problems
      like issues ACPI or other subsystems which are executed very early.
      
      If the config option is not enabled, no code is changed, and if the boot
      paramenter is not given, no new code is executed, and independent of that,
      all new code is freed after boot, so the config option can be even enabled
      in standard, non-debug kernels.
      
      With specialized tools, it is then possible to get debugging information
      from machines which have no serial ports (notebooks) such as the printk
      buffer contents, or any data which can be referenced from global pointers,
      if it is stored below the 4GB limit and even memory dumps of of the physical
      RAM region below the 4GB limit can be taken without any cooperation from the
      CPU of the host, so the machine can be crashed early, it does not matter.
      
      In the extreme, even kernel debuggers can be accessed in this way. I wrote
      a small kgdb module and an accompanying gdb stub for FireWire which allows
      to gdb to talk to kgdb using remote remory reads and writes over FireWire.
      
      An version of the gdb stub fore FireWire is able to read all global data
      from a system which is running a a normal kernel without any kernel debugger,
      without any interruption or support of the system's CPU. That way, e.g. the
      task struct and so on can be read and even manipulated when the physical DMA
      access is granted.
      
      A HOWTO is included in this patch, in Documentation/debugging-via-ohci1394.txt
      and I've put a copy online at
      ftp://ftp.suse.de/private/bk/firewire/docs/debugging-via-ohci1394.txt
      
      It also has links to all the tools which are available to make use of it
      another copy of it is online at:
      ftp://ftp.suse.de/private/bk/firewire/kernel/ohci1394_dma_early-v2.diffSigned-Off-By: NBernhard Kaindl <bk@suse.de>
      Tested-By: NThomas Renninger <trenn@suse.de>
      Signed-off-by: NIngo Molnar <mingo@elte.hu>
      Signed-off-by: NThomas Gleixner <tglx@linutronix.de>
      f212ec4b
    • G
      lguest: fix drivers/lguest Makefile entry · 7ea08093
      Glauber de Oliveira Costa 提交于
      Parts depend on CONFIG_LGUEST, not just CONFIG_LGUEST_GUEST
      Signed-off-by: NGlauber de Oliveira Costa <gcosta@redhat.com>
      Signed-off-by: NRusty Russell <rusty@rustcorp.com.au>
      7ea08093
  8. 23 10月, 2007 1 次提交
    • R
      Virtio interface · ec3d41c4
      Rusty Russell 提交于
      This attempts to implement a "virtual I/O" layer which should allow
      common drivers to be efficiently used across most virtual I/O
      mechanisms.  It will no-doubt need further enhancement.
      
      The virtio drivers add buffers to virtio queues; as the buffers are consumed
      the driver "interrupt" callbacks are invoked.
      
      There is also a generic implementation of config space which drivers can query
      to get setup information from the host.
      Signed-off-by: NRusty Russell <rusty@rustcorp.com.au>
      Cc: Dor Laor <dor.laor@qumranet.com>
      Cc: Arnd Bergmann <arnd@arndb.de>
      ec3d41c4
  9. 18 10月, 2007 2 次提交
  10. 17 10月, 2007 1 次提交
    • S
      DCA: Add Direct Cache Access driver · 7589670f
      Shannon Nelson 提交于
      Direct Cache Access (DCA) is a method for warming the CPU cache before data
      is used, with the intent of lessening the impact of cache misses.  This
      patch adds a manager and interface for matching up client requests for DCA
      services with devices that offer DCA services.
      
      In order to use DCA, a module must do bus writes with the appropriate tag
      bits set to trigger a cache read for a specific CPU.  However, different
      CPUs and chipsets can require different sets of tag bits, and the methods
      for determining the correct bits may be simple hardcoding or may be a
      hardware specific magic incantation.  This interface is a way for DCA
      clients to find the correct tag bits for the targeted CPU without needing
      to know the specifics.
      
          [Dave Miller] use DEFINE_SPINLOCK()
      Signed-off-by: NShannon Nelson <shannon.nelson@intel.com>
      Acked-by: NDavid S. Miller <davem@davemloft.net>
      Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
      7589670f
  11. 11 10月, 2007 1 次提交
  12. 10 10月, 2007 1 次提交
    • L
      cpuidle: consolidate 2.6.22 cpuidle branch into one patch · 4f86d3a8
      Len Brown 提交于
      commit e5a16b1f9eec0af7cfa0830304b41c1c0833cf9f
      Author: Len Brown <len.brown@intel.com>
      Date:   Tue Oct 2 23:44:44 2007 -0400
      
          cpuidle: shrink diff
      
          processor_idle.c |  440 +++++++++++++++++++++++++++++++++++++++++--
          1 file changed, 429 insertions(+), 11 deletions(-)
      Signed-off-by: NLen Brown <len.brown@intel.com>
      
      commit dfbb9d5aedfb18848a3e0d6f6e3e4969febb209c
      Author: Len Brown <len.brown@intel.com>
      Date:   Wed Sep 26 02:17:55 2007 -0400
      
          cpuidle: reduce diff size
      
          Reduces the cpuidle processor_idle.c diff vs 2.6.22 from this
           processor_idle.c | 2006 ++++++++++++++++++++++++++-----------------
           1 file changed, 1219 insertions(+), 787 deletions(-)
      
          to this:
           processor_idle.c |  502 +++++++++++++++++++++++++++++++++++++++----
           1 file changed, 458 insertions(+), 44 deletions(-)
      
          ...for the purpose of making the cpuilde patch less invasive
          and easier to review.
      
          no functional changes.  build tested only.
      Signed-off-by: NLen Brown <len.brown@intel.com>
      
      commit 889172fc915f5a7fe20f35b133cbd205ce69bf6c
      Author: Venki Pallipadi <venkatesh.pallipadi@intel.com>
      Date:   Thu Sep 13 13:40:05 2007 -0700
      
          cpuidle: Retain old ACPI policy for !CONFIG_CPU_IDLE
      
          Retain the old policy in processor_idle, so that when CPU_IDLE is not
          configured, old C-state policy will still be used. This provides a
          clean gradual migration path from old ACPI policy to new cpuidle
          based policy.
      Signed-off-by: NVenkatesh Pallipadi <venkatesh.pallipadi@intel.com>
      Signed-off-by: NLen Brown <len.brown@intel.com>
      
      commit 9544a8181edc7ecc33b3bfd69271571f98ed08bc
      Author: Venki Pallipadi <venkatesh.pallipadi@intel.com>
      Date:   Thu Sep 13 13:39:17 2007 -0700
      
          cpuidle: Configure governors by default
      
          Quoting Len "Do not give an option to users to shoot themselves in the foot".
      
          Remove the configurability of ladder and menu governors as they are
          needed for default policy of cpuidle. That way users will not be able to
          have cpuidle without any policy loosing all C-state power savings.
      Signed-off-by: NVenkatesh Pallipadi <venkatesh.pallipadi@intel.com>
      Signed-off-by: NLen Brown <len.brown@intel.com>
      
      commit 8975059a2c1e56cfe83d1bcf031bcf4cb39be743
      Author: Adam Belay <abelay@novell.com>
      Date:   Tue Aug 21 18:27:07 2007 -0400
      
          CPUIDLE: load ACPI properly when CPUIDLE is disabled
      
          Change the registration return codes for when CPUIDLE
          support is not compiled into the kernel.  As a result, the ACPI
          processor driver will load properly even if CPUIDLE is unavailable.
          However, it may be possible to cleanup the ACPI processor driver further
          and eliminate some dead code paths.
      Signed-off-by: NAdam Belay <abelay@novell.com>
      Acked-by: NVenkatesh Pallipadi <venkatesh.pallipadi@intel.com>
      Signed-off-by: NLen Brown <len.brown@intel.com>
      
      commit e0322e2b58dd1b12ec669bf84693efe0dc2414a8
      Author: Adam Belay <abelay@novell.com>
      Date:   Tue Aug 21 18:26:06 2007 -0400
      
          CPUIDLE: remove cpuidle_get_bm_activity()
      
          Remove cpuidle_get_bm_activity() and updates governors
          accordingly.
      Signed-off-by: NAdam Belay <abelay@novell.com>
      Acked-by: NVenkatesh Pallipadi <venkatesh.pallipadi@intel.com>
      Signed-off-by: NLen Brown <len.brown@intel.com>
      
      commit 18a6e770d5c82ba26653e53d240caa617e09e9ab
      Author: Adam Belay <abelay@novell.com>
      Date:   Tue Aug 21 18:25:58 2007 -0400
      
          CPUIDLE: max_cstate fix
      
          Currently max_cstate is limited to 0, resulting in no idle processor
          power management on ACPI platforms.  This patch restores the value to
          the array size.
      Signed-off-by: NAdam Belay <abelay@novell.com>
      Acked-by: NVenkatesh Pallipadi <venkatesh.pallipadi@intel.com>
      Signed-off-by: NLen Brown <len.brown@intel.com>
      
      commit 1fdc0887286179b40ce24bcdbde663172e205ef0
      Author: Adam Belay <abelay@novell.com>
      Date:   Tue Aug 21 18:25:40 2007 -0400
      
          CPUIDLE: handle BM detection inside the ACPI Processor driver
      
          Update the ACPI processor driver to detect BM activity and
          limit state entry depth internally, rather than exposing such
          requirements to CPUIDLE.  As a result, CPUIDLE can drop this
          ACPI-specific interface and become more platform independent.  BM
          activity is now handled much more aggressively than it was in the
          original implementation, so some testing coverage may be needed to
          verify that this doesn't introduce any DMA buffer under-run issues.
      Signed-off-by: NAdam Belay <abelay@novell.com>
      Acked-by: NVenkatesh Pallipadi <venkatesh.pallipadi@intel.com>
      Signed-off-by: NLen Brown <len.brown@intel.com>
      
      commit 0ef38840db666f48e3cdd2b769da676c57228dd9
      Author: Adam Belay <abelay@novell.com>
      Date:   Tue Aug 21 18:25:14 2007 -0400
      
          CPUIDLE: menu governor updates
      
          Tweak the menu governor to more effectively handle non-timer
          break events.  Non-timer break events are detected by comparing the
          actual sleep time to the expected sleep time.  In future revisions, it
          may be more reliable to use the timer data structures directly.
      Signed-off-by: NAdam Belay <abelay@novell.com>
      Acked-by: NVenkatesh Pallipadi <venkatesh.pallipadi@intel.com>
      Signed-off-by: NLen Brown <len.brown@intel.com>
      
      commit bb4d74fca63fa96cf3ace644b15ae0f12b7df5a1
      Author: Adam Belay <abelay@novell.com>
      Date:   Tue Aug 21 18:24:40 2007 -0400
      
          CPUIDLE: fix 'current_governor' sysfs entry
      
          Allow the "current_governor" sysfs entry to properly handle
          input terminated with '\n'.
      Signed-off-by: NAdam Belay <abelay@novell.com>
      Acked-by: NVenkatesh Pallipadi <venkatesh.pallipadi@intel.com>
      Signed-off-by: NLen Brown <len.brown@intel.com>
      
      commit df3c71559bb69b125f1a48971bf0d17f78bbdf47
      Author: Len Brown <len.brown@intel.com>
      Date:   Sun Aug 12 02:00:45 2007 -0400
      
          cpuidle: fix IA64 build (again)
      Signed-off-by: NLen Brown <len.brown@intel.com>
      
      commit a02064579e3f9530fd31baae16b1fc46b5a7bca8
      Author: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
      Date:   Sun Aug 12 01:39:27 2007 -0400
      
          cpuidle: Remove support for runtime changing of max_cstate
      
          Remove support for runtime changeability of max_cstate. Drivers can use
          use latency APIs.
      
          max_cstate can still be used as a boot time option and dmi override.
      Signed-off-by: NVenkatesh Pallipadi <venkatesh.pallipadi@intel.com>
      Signed-off-by: NLen Brown <len.brown@intel.com>
      
      commit 0912a44b13adf22f5e3f607d263aed23b4910d7e
      Author: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
      Date:   Sun Aug 12 01:39:16 2007 -0400
      
          cpuidle: Remove ACPI cstate_limit calls from ipw2100
      
          ipw2100 already has code to use accetable_latency interfaces to limit the
          C-state. Remove the calls to acpi_set_cstate_limit and acpi_get_cstate_limit
          as they are redundant.
      Signed-off-by: NVenkatesh Pallipadi <venkatesh.pallipadi@intel.com>
      Signed-off-by: NLen Brown <len.brown@intel.com>
      
      commit c649a76e76be6bff1fd770d0a775798813a3f6e0
      Author: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
      Date:   Sun Aug 12 01:35:39 2007 -0400
      
          cpuidle: compile fix for pause and resume functions
      
          Fix the compilation failure when cpuidle is not compiled in.
      Signed-off-by: NVenkatesh Pallipadi <venkatesh.pallipadi@intel.com>
      Acked-by: NAdam Belay <adam.belay@novell.com>
      Signed-off-by: NLen Brown <len.brown@intel.com>
      
      commit 2305a5920fb8ee6ccec1c62ade05aa8351091d71
      Author: Adam Belay <abelay@novell.com>
      Date:   Thu Jul 19 00:49:00 2007 -0400
      
          cpuidle: re-write
      
          Some portions have been rewritten to make the code cleaner and lighter
          weight.  The following is a list of changes:
      
          1.) the state name is now included in the sysfs interface
          2.) detection, hotplug, and available state modifications are handled by
          CPUIDLE drivers directly
          3.) the CPUIDLE idle handler is only ever installed when at least one
          cpuidle_device is enabled and ready
          4.) the menu governor BM code no longer overflows
          5.) the sysfs attributes are now printed as unsigned integers, avoiding
          negative values
          6.) a variety of other small cleanups
      
          Also, Idle drivers are no longer swappable during runtime through the
          CPUIDLE sysfs inteface.  On i386 and x86_64 most idle handlers (e.g.
          poll, mwait, halt, etc.) don't benefit from an infrastructure that
          supports multiple states, so I think using a more general case idle
          handler selection mechanism would be cleaner.
      Signed-off-by: NAdam Belay <abelay@novell.com>
      Acked-by: NVenkatesh Pallipadi <venkatesh.pallipadi@intel.com>
      Acked-by: NShaohua Li <shaohua.li@intel.com>
      Signed-off-by: NLen Brown <len.brown@intel.com>
      
      commit df25b6b56955714e6e24b574d88d1fd11f0c3ee5
      Author: Len Brown <len.brown@intel.com>
      Date:   Tue Jul 24 17:08:21 2007 -0400
      
          cpuidle: fix IA64 buid
      Signed-off-by: NLen Brown <len.brown@intel.com>
      
      commit fd6ada4c14488755ff7068860078c437431fbccd
      Author: Adrian Bunk <bunk@stusta.de>
      Date:   Mon Jul 9 11:33:13 2007 -0700
      
          cpuidle: static
      
          make cpuidle_replace_governor() static
      Signed-off-by: NAdrian Bunk <bunk@stusta.de>
          Cc: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
      Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: NLen Brown <len.brown@intel.com>
      
      commit c1d4a2cebcadf2429c0c72e1d29aa2a9684c32e0
      Author: Adrian Bunk <bunk@stusta.de>
      Date:   Tue Jul 3 00:54:40 2007 -0400
      
          cpuidle: static
      
          This patch makes the needlessly global struct menu_governor static.
      Signed-off-by: NAdrian Bunk <bunk@stusta.de>
      Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: NLen Brown <len.brown@intel.com>
      
      commit dbf8780c6e8d572c2c273da97ed1cca7608fd999
      Author: Andrew Morton <akpm@linux-foundation.org>
      Date:   Tue Jul 3 00:49:14 2007 -0400
      
          export symbol tick_nohz_get_sleep_length
      
          ERROR: "tick_nohz_get_sleep_length" [drivers/cpuidle/governors/menu.ko] undefined!
          ERROR: "tick_nohz_get_idle_jiffies" [drivers/cpuidle/governors/menu.ko] undefined!
      
          And please be sure to get your changes to core kernel suitably reviewed.
      
          Cc: Adam Belay <abelay@novell.com>
          Cc: Venki Pallipadi <venkatesh.pallipadi@intel.com>
          Cc: Ingo Molnar <mingo@elte.hu>
          Cc: Thomas Gleixner <tglx@linutronix.de>
          Cc: john stultz <johnstul@us.ibm.com>
      Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: NLen Brown <len.brown@intel.com>
      
      commit 29f0e248e7017be15f99febf9143a2cef00b2961
      Author: Andrew Morton <akpm@linux-foundation.org>
      Date:   Tue Jul 3 00:43:04 2007 -0400
      
          tick.h needs hrtimer.h
      
          It uses hrtimers.
      Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: NLen Brown <len.brown@intel.com>
      
      commit e40cede7d63a029e92712a3fe02faee60cc38fb4
      Author: Venki Pallipadi <venkatesh.pallipadi@intel.com>
      Date:   Tue Jul 3 00:40:34 2007 -0400
      
          cpuidle: first round of documentation updates
      
          Documentation changes based on Pavel's feedback.
      Signed-off-by: NVenkatesh Pallipadi <venkatesh.pallipadi@intel.com>
      Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: NLen Brown <len.brown@intel.com>
      
      commit 83b42be2efece386976507555c29e7773a0dfcd1
      Author: Venki Pallipadi <venkatesh.pallipadi@intel.com>
      Date:   Tue Jul 3 00:39:25 2007 -0400
      
          cpuidle: add rating to the governors and pick the one with highest rating by default
      
          Introduce a governor rating scheme to pick the right governor by default.
      Signed-off-by: NVenkatesh Pallipadi <venkatesh.pallipadi@intel.com>
      Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: NLen Brown <len.brown@intel.com>
      
      commit d2a74b8c5e8f22def4709330d4bfc4a29209b71c
      Author: Venki Pallipadi <venkatesh.pallipadi@intel.com>
      Date:   Tue Jul 3 00:38:08 2007 -0400
      
          cpuidle: make cpuidle sysfs driver governor switch off by default
      
          Make default cpuidle sysfs to show current_governor and current_driver in
          read-only mode.  More elaborate available_governors and available_drivers with
          writeable current_governor and current_driver interface only appear with
          "cpuidle_sysfs_switch" boot parameter.
      Signed-off-by: NVenkatesh Pallipadi <venkatesh.pallipadi@intel.com>
      Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: NLen Brown <len.brown@intel.com>
      
      commit 1f60a0e80bf83cf6b55c8845bbe5596ed8f6307b
      Author: Venki Pallipadi <venkatesh.pallipadi@intel.com>
      Date:   Tue Jul 3 00:37:00 2007 -0400
      
          cpuidle: menu governor: change the early break condition
      
          Change the C-state early break out algorithm in menu governor.
      
          We only look at early breakouts that result in wakeups shorter than idle
          state's target_residency.  If such a breakout is frequent enough, eliminate
          the particular idle state upto a timeout period.
      Signed-off-by: NVenkatesh Pallipadi <venkatesh.pallipadi@intel.com>
      Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: NLen Brown <len.brown@intel.com>
      
      commit 45a42095cf64b003b4a69be3ce7f434f97d7af51
      Author: Venki Pallipadi <venkatesh.pallipadi@intel.com>
      Date:   Tue Jul 3 00:35:38 2007 -0400
      
          cpuidle: fix uninitialized variable in sysfs routine
      
          Fix the uninitialized usage of ret.
      Signed-off-by: NVenkatesh Pallipadi <venkatesh.pallipadi@intel.com>
      Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: NLen Brown <len.brown@intel.com>
      
      commit 80dca7cdba3e6ee13eae277660873ab9584eb3be
      Author: Venki Pallipadi <venkatesh.pallipadi@intel.com>
      Date:   Tue Jul 3 00:34:16 2007 -0400
      
          cpuidle: reenable /proc/acpi//power interface for the time being
      
          Keep /proc/acpi/processor/CPU*/power around for a while as powertop depends
          on it. It will be marked deprecated and removed in future. powertop can use
          cpuidle interfaces instead.
      Signed-off-by: NVenkatesh Pallipadi <venkatesh.pallipadi@intel.com>
      Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: NLen Brown <len.brown@intel.com>
      
      commit 589c37c2646c5e3813a51255a5ee1159cb4c33fc
      Author: Venki Pallipadi <venkatesh.pallipadi@intel.com>
      Date:   Tue Jul 3 00:32:37 2007 -0400
      
          cpuidle: menu governor and hrtimer compile fix
      
          Compile fix for menu governor.
      Signed-off-by: NVenkatesh Pallipadi <venkatesh.pallipadi@intel.com>
      Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: NLen Brown <len.brown@intel.com>
      
      commit 0ba80bd9ab3ed304cb4f19b722e4cc6740588b5e
      Author: Len Brown <len.brown@intel.com>
      Date:   Thu May 31 22:51:43 2007 -0400
      
          cpuidle: build fix - cpuidle vs ipw2100 module
      
          ERROR: "acpi_set_cstate_limit" [drivers/net/wireless/ipw2100.ko] undefined!
      Signed-off-by: NLen Brown <len.brown@intel.com>
      
      commit d7d8fa7f96a7f7682be7c6cc0cc53fa7a18c3b58
      Author: Adam Belay <abelay@novell.com>
      Date:   Sat Mar 24 03:47:07 2007 -0400
      
          cpuidle: add the 'menu' governor
      
          Here is my first take at implementing an idle PM governor that takes
          full advantage of NO_HZ.  I call it the 'menu' governor because it
          considers the full list of idle states before each entry.
      
          I've kept the implementation fairly simple.  It attempts to guess the
          next residency time and then chooses a state that would meet at least
          the break-even point between power savings and entry cost.  To this end,
          it selects the deepest idle state that satisfies the following
          constraints:
               1. If the idle time elapsed since bus master activity was detected
                  is below a threshold (currently 20 ms), then limit the selection
                  to C2-type or above.
               2. Do not choose a state with a break-even residency that exceeds
                  the expected time remaining until the next timer interrupt.
               3. Do not choose a state with a break-even residency that exceeds
                  the elapsed time between the last pair of break events,
                  excluding timer interrupts.
      
          This governor has an advantage over "ladder" governor because it
          proactively checks how much time remains until the next timer interrupt
          using the tick infrastructure.  Also, it handles device interrupt
          activity more intelligently by not including timer interrupts in break
          event calculations.  Finally, it doesn't make policy decisions using the
          number of state entries, which can have variable residency times (NO_HZ
          makes these potentially very large), and instead only considers sleep
          time deltas.
      
          The menu governor can be selected during runtime using the cpuidle sysfs
          interface like so:
          "echo "menu" > /sys/devices/system/cpu/cpuidle/current_governor"
      Signed-off-by: NAdam Belay <abelay@novell.com>
      Signed-off-by: NLen Brown <len.brown@intel.com>
      
      commit a4bec7e65aa3b7488b879d971651cc99a6c410fe
      Author: Adam Belay <abelay@novell.com>
      Date:   Sat Mar 24 03:47:03 2007 -0400
      
          cpuidle: export time until next timer interrupt using NO_HZ
      
          Expose information about the time remaining until the next
          timer interrupt expires by utilizing the dynticks infrastructure.
          Also modify the main idle loop to allow dynticks to handle
          non-interrupt break events (e.g. DMA).  Finally, expose sleep ticks
          information to external code.  Thomas Gleixner is responsible for much
          of the code in this patch.  However, I've made some additional changes,
          so I'm probably responsible if there are any bugs or oversights :)
      Signed-off-by: NAdam Belay <abelay@novell.com>
      Signed-off-by: NLen Brown <len.brown@intel.com>
      
      commit 2929d8996fbc77f41a5ff86bb67cdde3ca7d2d72
      Author: Adam Belay <abelay@novell.com>
      Date:   Sat Mar 24 03:46:58 2007 -0400
      
          cpuidle: governor API changes
      
          This patch prepares cpuidle for the menu governor.  It adds an optional
          stage after idle state entry to give the governor an opportunity to
          check why the state was exited.  Also it makes sure the idle loop
          returns after each state entry, allowing the appropriate dynticks code
          to run.
      Signed-off-by: NAdam Belay <abelay@novell.com>
      Signed-off-by: NLen Brown <len.brown@intel.com>
      
      commit 3a7fd42f9825c3b03e364ca59baa751bb350775f
      Author: Venki Pallipadi <venkatesh.pallipadi@intel.com>
      Date:   Thu Apr 26 00:03:59 2007 -0700
      
          cpuidle: hang fix
      
          Prevent hang on x86-64, when ACPI processor driver is added as a module on
          a system that does not support C-states.
      
          x86-64 expects all idle handlers to enable interrupts before returning from
          idle handler.  This is due to enter_idle(), exit_idle() races.  Make
          cpuidle_idle_call() confirm to this when there is no pm_idle_old.
      
          Also, cpuidle look at the return values of attch_driver() and set
          current_driver to NULL if attach fails on all CPUs.
      Signed-off-by: NVenkatesh Pallipadi <venkatesh.pallipadi@intel.com>
      Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: NLen Brown <len.brown@intel.com>
      
      commit 4893339a142afbd5b7c01ffadfd53d14746e858e
      Author: Shaohua Li <shaohua.li@intel.com>
      Date:   Thu Apr 26 10:40:09 2007 +0800
      
          cpuidle: add support for max_cstate limit
      
          With CPUIDLE framework, the max_cstate (to limit max cpu c-state)
          parameter is ingored. Some systems require it to ignore C2/C3
          and some drivers like ipw require it too.
      Signed-off-by: NShaohua Li <shaohua.li@intel.com>
      Signed-off-by: NLen Brown <len.brown@intel.com>
      
      commit 43bbbbe1cb998cbd2df656f55bb3bfe30f30e7d1
      Author: Shaohua Li <shaohua.li@intel.com>
      Date:   Thu Apr 26 10:40:13 2007 +0800
      
          cpuidle: add cpuidle_fore_redetect_devices API
      
          add cpuidle_force_redetect_devices API,
          which forces all CPU redetect idle states.
          Next patch will use it.
      Signed-off-by: NShaohua Li <shaohua.li@intel.com>
      Signed-off-by: NLen Brown <len.brown@intel.com>
      
      commit d1edadd608f24836def5ec483d2edccfb37b1d19
      Author: Shaohua Li <shaohua.li@intel.com>
      Date:   Thu Apr 26 10:40:01 2007 +0800
      
          cpuidle: fix sysfs related issue
      
          Fix the cpuidle sysfs issue.
          a. make kobject dynamicaly allocated
          b. fixed sysfs init issue to avoid suspend/resume issue
      Signed-off-by: NShaohua Li <shaohua.li@intel.com>
      Signed-off-by: NLen Brown <len.brown@intel.com>
      
      commit 7169a5cc0d67b263978859672e86c13c23a5570d
      Author: Randy Dunlap <randy.dunlap@oracle.com>
      Date:   Wed Mar 28 22:52:53 2007 -0400
      
          cpuidle: 1-bit field must be unsigned
      
          A 1-bit bitfield has no room for a sign bit.
          drivers/cpuidle/governors/ladder.c:54:16: error: dubious bitfield without explicit `signed' or `unsigned'
      Signed-off-by: NRandy Dunlap <randy.dunlap@oracle.com>
          Cc: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
      Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: NLen Brown <len.brown@intel.com>
      
      commit 4658620158dc2fbd9e4bcb213c5b6fb5d05ba7d4
      Author: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
      Date:   Wed Mar 28 22:52:41 2007 -0400
      
          cpuidle: fix boot hang
      
          Patch for cpuidle boot hang reported by Larry Finger here.
          http://www.ussg.iu.edu/hypermail/linux/kernel/0703.2/2025.htmlSigned-off-by: NVenkatesh Pallipadi <venkatesh.pallipadi@intel.com>
          Cc: Larry Finger <larry.finger@lwfinger.net>
      Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: NLen Brown <len.brown@intel.com>
      
      commit c17e168aa6e5fe3851baaae8df2fbc1cf11443a9
      Author: Len Brown <len.brown@intel.com>
      Date:   Wed Mar 7 04:37:53 2007 -0500
      
          cpuidle: ladder does not depend on ACPI
      
          build fix for CONFIG_ACPI=n
      
          In file included from drivers/cpuidle/governors/ladder.c:21:
          include/acpi/processor.h:88: error: expected specifier-qualifier-list before ‘acpi_integer’
          include/acpi/processor.h:106: error: expected specifier-qualifier-list before ‘acpi_integer’
          include/acpi/processor.h:168: error: expected specifier-qualifier-list before ‘acpi_handle’
      Signed-off-by: NLen Brown <len.brown@intel.com>
      
      commit 8c91d958246bde68db0c3f0c57b535962ce861cb
      Author: Adrian Bunk <bunk@stusta.de>
      Date:   Tue Mar 6 02:29:40 2007 -0800
      
          cpuidle: make code static
      
          This patch makes the following needlessly global code static:
          - driver.c: __cpuidle_find_driver()
          - governor.c: __cpuidle_find_governor()
          - ladder.c: struct ladder_governor
      Signed-off-by: NAdrian Bunk <bunk@stusta.de>
          Cc: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
          Cc: Adam Belay <abelay@novell.com>
          Cc: Shaohua Li <shaohua.li@intel.com>
      Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: NLen Brown <len.brown@intel.com>
      
      commit 0c39dc3187094c72c33ab65a64d2017b21f372d2
      Author: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
      Date:   Wed Mar 7 02:38:22 2007 -0500
      
          cpu_idle: fix build break
      
          This patch fixes a build breakage with !CONFIG_HOTPLUG_CPU and
          CONFIG_CPU_IDLE.
      Signed-off-by: NVenkatesh Pallipadi <venkatesh.pallipadi@intel.com>
      Signed-off-by: NAdrian Bunk <bunk@stusta.de>
      Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: NLen Brown <len.brown@intel.com>
      
      commit 8112e3b115659b07df340ef170515799c0105f82
      Author: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
      Date:   Tue Mar 6 02:29:39 2007 -0800
      
          cpuidle: build fix for !CPU_IDLE
      
          Fix the compile issues when CPU_IDLE is not configured.
      Signed-off-by: NVenkatesh Pallipadi <venkatesh.pallipadi@intel.com>
          Cc: Adam Belay <abelay@novell.com>
          Cc: Shaohua Li <shaohua.li@intel.com>
      Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: NLen Brown <len.brown@intel.com>
      
      commit 1eb4431e9599cd25e0d9872f3c2c8986821839dd
      Author: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
      Date:   Thu Feb 22 13:54:57 2007 -0800
      
          cpuidle take2: Basic documentation for cpuidle
      
          Documentation for cpuidle infrastructure
      Signed-off-by: NVenkatesh Pallipadi <venkatesh.pallipadi@intel.com>
      Signed-off-by: NAdam Belay <abelay@novell.com>
      Signed-off-by: NShaohua Li <shaohua.li@intel.com>
      Signed-off-by: NLen Brown <len.brown@intel.com>
      
      commit ef5f15a8b79123a047285ec2e3899108661df779
      Author: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
      Date:   Thu Feb 22 13:54:03 2007 -0800
      
          cpuidle take2: Hookup ACPI C-states driver with cpuidle
      
          Hookup ACPI C-states onto generic cpuidle infrastructure.
      
          drivers/acpi/procesor_idle.c is now a ACPI C-states driver that registers as
          a driver in cpuidle infrastructure and the policy part is removed from
          drivers/acpi/processor_idle.c. We use governor in cpuidle instead.
      Signed-off-by: NShaohua Li <shaohua.li@intel.com>
      Signed-off-by: NVenkatesh Pallipadi <venkatesh.pallipadi@intel.com>
      Signed-off-by: NAdam Belay <abelay@novell.com>
      Signed-off-by: NLen Brown <len.brown@intel.com>
      
      commit 987196fa82d4db52c407e8c9d5dec884ba602183
      Author: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
      Date:   Thu Feb 22 13:52:57 2007 -0800
      
          cpuidle take2: Core cpuidle infrastructure
      
          Announcing 'cpuidle', a new CPU power management infrastructure to manage
          idle CPUs in a clean and efficient manner.
          cpuidle separates out the drivers that can provide support for multiple types
          of idle states and policy governors that decide on what idle state to use
          at run time.
          A cpuidle driver can support multiple idle states based on parameters like
          varying power consumption, wakeup latency, etc (ACPI C-states for example).
          A cpuidle governor can be usage model specific (laptop, server,
          laptop on battery etc).
          Main advantage of the infrastructure being, it allows independent development
          of drivers and governors and allows for better CPU power management.
      
          A huge thanks to Adam Belay and Shaohua Li who were part of this mini-project
          since its beginning and are greatly responsible for this patchset.
      
          This patch:
      
          Core cpuidle infrastructure.
          Introduces a new abstraction layer for cpuidle:
          * which manages drivers that can support multiple idles states. Drivers
            can be generic or particular to specific hardware/platform
          * allows pluging in multiple policy governors that can take idle state policy
            decision
          * The core also has a set of sysfs interfaces with which administrato can know
            about supported drivers and governors and switch them at run time.
      Signed-off-by: NAdam Belay <abelay@novell.com>
      Signed-off-by: NShaohua Li <shaohua.li@intel.com>
      Signed-off-by: NVenkatesh Pallipadi <venkatesh.pallipadi@intel.com>
      Signed-off-by: NLen Brown <len.brown@intel.com>
      Signed-off-by: NLen Brown <len.brown@intel.com>
      4f86d3a8
  13. 30 7月, 2007 1 次提交
    • W
      [WATCHDOG] Fix pcwd_init_module crash · 647e50f3
      Wim Van Sebroeck 提交于
      Fix for the problem detected by Ingo Molnar:
      enabling CONFIG_PCWATCHDOG=y crashes bzImage bootup.
      
      The reason for this can be found in drivers/makefile
      We first do:
      obj-y                           += char/
      and later we do:
      obj-y                           += base/ block/ misc/ mfd/ net/ media/
      
      So if we put a platform or isa or usb bus driver in char/watchdog
      (which is called from the Makefile in drivers/char/Makefile)
      then we didn't have the different device drivers initialized yet
      (they are in drivers/base and drivers/usb and ...)
      
      This fix makes sure that we compile the watchdog drivers after
      drivers/base, drivers/misc, drivers/pci and drivers/usb.
      We also do the compile after hwmon because in the future the
      watchdog temperature support will use the hwmon system.
      Signed-off-by: NWim Van Sebroeck <wim@iguana.be>
      647e50f3
  14. 20 7月, 2007 2 次提交
  15. 19 7月, 2007 1 次提交
    • H
      UIO: Add the User IO core code · beafc54c
      Hans J. Koch 提交于
      This interface allows the ability to write the majority of a driver in
      userspace with only a very small shell of a driver in the kernel itself.
      It uses a char device and sysfs to interact with a userspace process to
      process interrupts and control memory accesses.
      
      See the docbook documentation for more details on how to use this
      interface.
      
      From: Hans J. Koch <hjk@linutronix.de>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: Benedikt Spranger <b.spranger@linutronix.de>
      Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>
      beafc54c
  16. 18 7月, 2007 1 次提交
  17. 10 7月, 2007 1 次提交
    • A
      [BATTERY] Universal power supply class (was: battery class) · 4a11b59d
      Anton Vorontsov 提交于
      This class is result of "external power" and "battery" classes merge,
      as suggested by David Woodhouse. He also implemented uevent support.
      
      Here how userspace seeing it now:
      
          	# ls /sys/class/power\ supply/
          	ac  main-battery  usb
      
          	# cat /sys/class/power\ supply/ac/type
          	AC
      
          	# cat /sys/class/power\ supply/usb/type
          	USB
      
          	# cat /sys/class/power\ supply/main-battery/type
          	Battery
      
          	# cat /sys/class/power\ supply/ac/online
          	1
      
          	# cat /sys/class/power\ supply/usb/online
          	0
      
          	# cat /sys/class/power\ supply/main-battery/status
          	Charging
      
          	# cat /sys/class/leds/h5400\:red-left/trigger
          	none h5400-radio timer hwtimer ac-online usb-online
          	main-battery-charging-or-full [main-battery-charging]
          	main-battery-full
      Signed-off-by: NAnton Vorontsov <cbou@mail.ru>
      Signed-off-by: NDavid Woodhouse <dwmw2@infradead.org>
      Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
      4a11b59d
  18. 02 5月, 2007 1 次提交
    • D
      i2c: Add i2c_board_info and i2c_new_device() · 9c1600ed
      David Brownell 提交于
      This provides partial support for new-style I2C driver binding.  It builds
      on "struct i2c_board_info" declarations that identify I2C devices on a given
      board.  This is needed on systems with I2C devices that can't be fully probed
      and/or autoconfigured, such as many embedded Linux configurations where the
      way a given I2C device is wired may affect how it must be used.
      
      There are two models for declaring such devices:
      
       * LATE -- using a public function i2c_new_device().  This lets modules
         declare I2C devices found *AFTER* a given I2C adapter becomes available.
         
         For example, a PCI card could create adapters giving access to utility
         chips on that card, and this would be used to associate those chips with
         those adapters.
      
       * EARLY -- from arch_initcall() level code, using a non-exported function
         i2c_register_board_info().  This copies the declarations *BEFORE* such
         an i2c_adapter becomes available, arranging that i2c_new_device() will
         be called later when i2c-core registers the relevant i2c_adapter.
      
         For example, arch/.../.../board-*.c files would declare the I2C devices
         along with their platform data, and I2C devices would behave much like
         PNPACPI devices.  (That is, both enumerate from board-specific tables.)
      
      To match the exported i2c_new_device(), the previously-private function
      i2c_unregister_device() is now exported.
      
      Pending later patches using these new APIs, this is effectively a NOP.
      Signed-off-by: NDavid Brownell <dbrownell@users.sourceforge.net>
      Signed-off-by: NJean Delvare <khali@linux-fr.org>
      9c1600ed
  19. 19 4月, 2007 1 次提交
  20. 21 3月, 2007 1 次提交
  21. 10 3月, 2007 1 次提交
  22. 12 2月, 2007 1 次提交
    • M
      [PATCH] drivers: add LCD support · 70e84049
      Miguel Ojeda Sandonis 提交于
      Add support for auxiliary displays, the ks0108 LCD controller, the
      cfag12864b LCD and adds a framebuffer device: cfag12864bfb.
      
      - Add a "auxdisplay/" folder in "drivers/" for auxiliary display
        drivers.
      
      - Add support for the ks0108 LCD Controller as a device driver.  (uses
        parport interface)
      
      - Add support for the cfag12864b LCD as a device driver.  (uses ks0108
        LCD Controller driver)
      
      - Add a framebuffer device called cfag12864bfb.  (uses cfag12864b LCD
        driver)
      
      - Add the usual Documentation, includes, Makefiles, Kconfigs,
        MAINTAINERS, CREDITS...
      
      - Miguel Ojeda will maintain all the stuff above.
      
      [rdunlap@xenotime.net: workqueue fixups]
      [akpm@osdl.org: kconfig fix]
      Signed-off-by: NMiguel Ojeda Sandonis <maxextreme@gmail.com>
      Cc: Greg KH <greg@kroah.com>
      Acked-by: NPaulo Marques <pmarques@grupopie.com>
      Cc: "Randy.Dunlap" <rdunlap@xenotime.net>
      Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
      70e84049
  23. 10 2月, 2007 1 次提交
  24. 11 12月, 2006 1 次提交
    • A
      [PATCH] kvm: userspace interface · 6aa8b732
      Avi Kivity 提交于
      web site: http://kvm.sourceforge.net
      
      mailing list: kvm-devel@lists.sourceforge.net
        (http://lists.sourceforge.net/lists/listinfo/kvm-devel)
      
      The following patchset adds a driver for Intel's hardware virtualization
      extensions to the x86 architecture.  The driver adds a character device
      (/dev/kvm) that exposes the virtualization capabilities to userspace.  Using
      this driver, a process can run a virtual machine (a "guest") in a fully
      virtualized PC containing its own virtual hard disks, network adapters, and
      display.
      
      Using this driver, one can start multiple virtual machines on a host.
      
      Each virtual machine is a process on the host; a virtual cpu is a thread in
      that process.  kill(1), nice(1), top(1) work as expected.  In effect, the
      driver adds a third execution mode to the existing two: we now have kernel
      mode, user mode, and guest mode.  Guest mode has its own address space mapping
      guest physical memory (which is accessible to user mode by mmap()ing
      /dev/kvm).  Guest mode has no access to any I/O devices; any such access is
      intercepted and directed to user mode for emulation.
      
      The driver supports i386 and x86_64 hosts and guests.  All combinations are
      allowed except x86_64 guest on i386 host.  For i386 guests and hosts, both pae
      and non-pae paging modes are supported.
      
      SMP hosts and UP guests are supported.  At the moment only Intel
      hardware is supported, but AMD virtualization support is being worked on.
      
      Performance currently is non-stellar due to the naive implementation of the
      mmu virtualization, which throws away most of the shadow page table entries
      every context switch.  We plan to address this in two ways:
      
      - cache shadow page tables across tlb flushes
      - wait until AMD and Intel release processors with nested page tables
      
      Currently a virtual desktop is responsive but consumes a lot of CPU.  Under
      Windows I tried playing pinball and watching a few flash movies; with a recent
      CPU one can hardly feel the virtualization.  Linux/X is slower, probably due
      to X being in a separate process.
      
      In addition to the driver, you need a slightly modified qemu to provide I/O
      device emulation and the BIOS.
      
      Caveats (akpm: might no longer be true):
      
      - The Windows install currently bluescreens due to a problem with the
        virtual APIC.  We are working on a fix.  A temporary workaround is to
        use an existing image or install through qemu
      - Windows 64-bit does not work.  That's also true for qemu, so it's
        probably a problem with the device model.
      
      [bero@arklinux.org: build fix]
      [simon.kagstrom@bth.se: build fix, other fixes]
      [uril@qumranet.com: KVM: Expose interrupt bitmap]
      [akpm@osdl.org: i386 build fix]
      [mingo@elte.hu: i386 fixes]
      [rdreier@cisco.com: add log levels to all printks]
      [randy.dunlap@oracle.com: Fix sparse NULL and C99 struct init warnings]
      [anthony@codemonkey.ws: KVM: AMD SVM: 32-bit host support]
      Signed-off-by: NYaniv Kamay <yaniv@qumranet.com>
      Signed-off-by: NAvi Kivity <avi@qumranet.com>
      Cc: Simon Kagstrom <simon.kagstrom@bth.se>
      Cc: Bernhard Rosenkraenzer <bero@arklinux.org>
      Signed-off-by: NUri Lublin <uril@qumranet.com>
      Cc: Ingo Molnar <mingo@elte.hu>
      Cc: Roland Dreier <rolandd@cisco.com>
      Signed-off-by: NRandy Dunlap <randy.dunlap@oracle.com>
      Signed-off-by: NAnthony Liguori <anthony@codemonkey.ws>
      Signed-off-by: NAndrew Morton <akpm@osdl.org>
      Signed-off-by: NLinus Torvalds <torvalds@osdl.org>
      6aa8b732
  25. 09 12月, 2006 1 次提交
  26. 04 12月, 2006 2 次提交
  27. 10 8月, 2006 1 次提交
  28. 27 6月, 2006 1 次提交
  29. 18 6月, 2006 1 次提交
  30. 01 4月, 2006 2 次提交
  31. 28 3月, 2006 1 次提交
  32. 19 2月, 2006 1 次提交
  33. 27 1月, 2006 1 次提交
  34. 19 1月, 2006 1 次提交
  35. 14 1月, 2006 1 次提交
    • D
      [PATCH] spi: simple SPI framework · 8ae12a0d
      David Brownell 提交于
      This is the core of a small SPI framework, implementing the model of a
      queue of messages which complete asynchronously (with thin synchronous
      wrappers on top).
      
        - It's still less than 2KB of ".text" (ARM).  If there's got to be a
          mid-layer for something so simple, that's the right size budget.  :)
      
        - The guts use board-specific SPI device tables to build the driver
          model tree.  (Hardware probing is rarely an option.)
      
        - This version of Kconfig includes no drivers.  At this writing there
          are two known master controller drivers (PXA/SSP, OMAP MicroWire)
          and three protocol drivers (CS8415a, ADS7846, DataFlash) with LKML
          mentions of other drivers in development.
      
        - No userspace API.  There are several implementations to compare.
          Implement them like any other driver, and bind them with sysfs.
      
      The changes from last version posted to LKML (on 11-Nov-2005) are minor,
      and include:
      
        - One bugfix (removes a FIXME), with the visible effect of making device
          names be "spiB.C" where B is the bus number and C is the chipselect.
      
        - The "caller provides DMA mappings" mechanism now has kerneldoc, for
          DMA drivers that want to be fancy.
      
        - Hey, the framework init can be subsys_init.  Even though board init
          logic fires earlier, at arch_init ... since the framework init is
          for driver support, and the board init support uses static init.
      
        - Various additional spec/doc clarifications based on discussions
          with other folk.  It adds a brief "thank you" at the end, for folk
          who've helped nudge this framework into existence.
      
      As I've said before, I think that "protocol tweaking" is the main support
      that this driver framework will need to evolve.
      
      From: Mark Underwood <basicmark@yahoo.com>
      
        Update the SPI framework to remove a potential priority inversion case by
        reverting to kmalloc if the pre-allocated DMA-safe buffer isn't available.
      Signed-off-by: NDavid Brownell <dbrownell@users.sourceforge.net>
      Signed-off-by: NAndrew Morton <akpm@osdl.org>
      Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>
      8ae12a0d