This reverts commit bf726eab, as it has
been reported to cause a regression with processes stuck in __down(),
apparently because some missing wakeup.

Quoth Sven Wegener:
 "I'm currently investigating a regression that has showed up with my
  last git pull yesterday.  Bisecting the commits showed bf726e
  "semaphore: fix" to be the culprit, reverting it fixed the issue.

  Symptoms: During heavy filesystem usage (e.g.  a kernel compile) I get
  several compiler processes in uninterruptible sleep, blocking all i/o
  on the filesystem.  System is an Intel Core 2 Quad running a 64bit
  kernel and userspace.  Filesystem is xfs on top of lvm.  See below for
  the output of sysrq-w."

See

	http://lkml.org/lkml/2008/5/10/45

for full report.

In the meantime, we can just fix the BKL performance regression by
reverting back to the good old BKL spinlock implementation instead,
since any sleeping lock will generally perform badly, especially if it
tries to be fair.
Reported-by: NSven Wegener <sven.wegener@stealer.net>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

..instead of cooking up its own uglier local version of it.
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

It actually makes much more sense there, and we do tend to need it for
non-RCU usage too.  Moving it to <linux/compiler.h> will allow some
other cases that have open-coded the same logic to use the same helper
function that RCU has used.
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/cooloney/blackfin-2.6: (21 commits)
  Blackfin Serial Driver: abstract away DLAB differences into header
  Blackfin Serial Driver: macro away the IER differences between processors
  [Blackfin] arch: remove useless IRQ_SW_INT defines
  [Blackfin] arch: protect linux/usb/musb.h include until the driver gets mainlined
  [Blackfin] arch: protect linux/usb/isp1362.h include until the driver gets mainlined
  [Blackfin] arch: add EBIU supporting for BF54x EZKIT SMSC LAN911x/LAN921x families embedded ethernet driver
  [Blackfin] arch: Set spi flash partition on bf527 as like bf548.
  [Blackfin] arch: fix bug - Remove module will not free L1 memory used
  [Blackfin] arch: fix wrong header name in comment
  [Blackfin] arch: Fix BUG - spi flash on bf527 ezkit would fail at mount
  [Blackfin] arch: add twi_lcd and twi_keypad i2c board info to bf527-ezkit
  [Blackfin] arch: Add physmap partition for BF527-EZkit
  [Blackfin] arch: fix gdb testing regression
  [Blackfin] arch: disable single stepping when delivering a signal
  [Blackfin] arch: Delete unused (copied from m68k) entries in asm-offsets.c.
  [Blackfin] arch: In the double fault handler, set up the PT_RETI slot
  [Blackfin] arch: Support for CPU_FREQ and NOHZ
  [Blackfin] arch: Functional power management support: Add CPU and platform voltage scaling support
  [Blackfin] arch: fix bug -  breaking the atomic sections code.
  [Blackfin] arch: Equalize include files: Add VR_CTL masks
  ...

* git://git.kernel.org/pub/scm/linux/kernel/git/sfrench/cifs-2.6:
  [CIFS] fix build warning
  [CIFS] Fixed build warning in is_ip
  [CIFS] cleanup cifsd completion
  [CIFS] Remove over-indented code in find_unc().
  [CIFS] fix typo
  [CIFS] Remove duplicate call to mode_to_acl
  [CIFS] convert usage of implicit booleans to bool
  [CIFS] fixed compatibility issue with samba refferal request
  [CIFS] Fix statfs formatting
  [CIFS] Adds to dns_resolver checking if the server name is an IP addr and skipping upcall in this case.
  [CIFS] Fix spelling mistake
  [CIFS] Update cifs version number

* git://git.kernel.org/pub/scm/linux/kernel/git/lethal/sh-2.6: (37 commits)
  SH: catch negative denormal_subf1() retval in denormal_add()
  sh: Fix DMAC base address for SH7709S
  sh: update smc91x platform data for se7206.
  sh: Stub in cpu_to_node() and friends for NUMA build.
  sh: intc register modify fix
  sh: no high level trigger on some sh3 cpus
  sh: clean up sh7710 and sh7720 intc tables
  sh: add interrupt ack code to sh3
  sh: unify external irq pin code for sh3
  sh-sci: avoid writing to nonexistent registers
  sh-sci: sh7722 lacks scsptr registers
  sh-sci: improve sh7722 support
  sh: reset hardware from early printk
  sh: drain and wait for early printk
  sh: use sci_out() for early printk
  sh: add memory resources to /proc/iomem
  sh: add kernel bss resource
  sh: fix sh7705 interrupt vector typo
  sh: update smc91x platform data for se7722
  sh: update smc91x platform data for MigoR
  ...

* git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6:
  [CRYPTO] hmac: Avoid calling virt_to_page on key

* 'merge' of git://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpc: (23 commits)
  [POWERPC] Remove leftover printk in isa-bridge.c
  [POWERPC] Remove duplicate #include
  [POWERPC] Initialize lockdep earlier
  [POWERPC] Document when printk is useable
  [POWERPC] Fix bogus paca->_current initialization
  [POWERPC] Fix of_i2c include for module compilation
  [POWERPC] Make default cputable entries reflect selected CPU family
  [POWERPC] spufs: lockdep annotations for spufs_dir_close
  [POWERPC] spufs: don't requeue victim contex in find_victim if it's not in spu_run
  [POWERPC] 4xx: Fix PCI mem in sequoia DTS
  [POWERPC] 4xx: Add endpoint support to 4xx PCIe driver
  [POWERPC] 4xx: Fix problem with new TLB storage attibute fields on 440x6 core
  [POWERPC] spufs: spu_create should send inotify IM_CREATE event
  [POWERPC] spufs: handle faults while the context switch pending flag is set
  [POWERPC] spufs: fix concurrent delivery of class 0 & 1 exceptions
  [POWERPC] spufs: try to route SPU interrupts to local node
  [POWERPC] spufs: set SPU_CONTEXT_SWITCH_PENDING before synchronising SPU irqs
  [POWERPC] spufs: don't acquire state_mutex interruptible while performing callback
  [POWERPC] spufs: update master runcntl with context lock held
  [POWERPC] spufs: fix post-stopped update of MFC_CNTL register
  ...

m32r can use the generic sys_pipe implementation.

The current sys_pipe implementation on m32r only differes from the
generic one by passing a lot of additional unused registers to sys_pipe.

Reviewed and tested by Hirokazu Takata.
Signed-off-by: NChristoph Hellwig <hch@lst.de>
Acked-by: NHirokazu Takata <takata@linux-m32r.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

The cris implementation of sys_pipe only differs from the generic one
by taking the BKL before calling do_pipe which isn't not nessecary.

Just kill the cris implementation and use the generic one.
Signed-off-by: NChristoph Hellwig <hch@lst.de>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6:
  sit: Add missing kfree_skb() on pskb_may_pull() failure.
  tipc: Increase buffer header to support worst-case device

Linus found a logic bug: we ignore the version number in a module's
vermagic string if we have CONFIG_MODVERSIONS set, but modversions
also lets through a module with no __versions section for modprobe
--force (with tainting, but still).

We should only ignore the start of the vermagic string if the module
actually *has* crcs to check.  Rather than (say) having an
entertaining hissy fit and creating a config option to work around the
buggy code.
Signed-off-by: NRusty Russell <rusty@rustcorp.com.au>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

We allow missing __versions sections, because modprobe --force strips
it.  It makes less sense to allow sections where there's no version
for a specific symbol the module uses, so disallow that.
Signed-off-by: NRusty Russell <rusty@rustcorp.com.au>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Don't allow a module built without versions altogether to be inserted
into a kernel which expects modversions.

modprobe --force will strip vermagic as well as modversions, so it
won't be effected, but this will make sure that a
non-CONFIG_MODVERSIONS module won't be accidentally inserted into a
CONFIG_MODVERSIONS kernel.
Signed-off-by: NRusty Russell <rusty@rustcorp.com.au>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

'ix' is unsigned but denormal_subf1() may return a negative int.
Signed-off-by: NRoel Kluin <12o3l@tiscali.nl>
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

This printk() appears twice in the same function.  Only the latter one
in the inval_range: section appears to be legitimate.
Signed-off-by: NNate Case <ncase@xes-inc.com>
Acked-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: NPaul Mackerras <paulus@samba.org>

Remove duplicate #include of <asm/prom.h> in
arch/powerpc/kernel/btext.c.
Signed-off-by: NHuang Weiyi <weiyi.huang@gmail.com>
Signed-off-by: NPaul Mackerras <paulus@samba.org>

This moves lockdep_init() to before udbg_early_init() as the later
can call things that acquire spinlocks etc...  This also makes printk
safer to use earlier.
Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: NPaul Mackerras <paulus@samba.org>

When debugging early boot problems, it's common to sprinkle printk's
all over the place.  However, on 64-bit powerpc, this can lead to
memory corruption if done too early due to the PACA pointer and
lockdep core not being initialized.

This adds some comments to early_setup() that document when it is
safe to do so in order to save time for whoever has to debug that
stuff next.
Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: NPaul Mackerras <paulus@samba.org>

When doing lockdep, I had two patches to initialize paca->_current
early, one bogus, and one correct.  Unfortunately both got merged
as the bad one ended up being part of the main lockdep patch by
mistake.  This causes memory corruption at boot.  This removes
the offending code.
Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: NPaul Mackerras <paulus@samba.org>

Remove #ifdef CONFIG_OF_I2C as this breaks module compilation.
Drivers using this header should depend on OF_I2C anyways, so
there's no need to make this conditional.
Signed-off-by: NJochen Friedrich <jochen@scram.de>
Signed-off-by: NPaul Mackerras <paulus@samba.org>

Changes the cputable so that various CPU families that have an exclusive
CONFIG_ option have a more sensible default entry to use if the specific
processor hasn't been identified.

This makes the kernel more generally useful when booted on an unknown
PVR for things like new 4xx variants.
Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: NPaul Mackerras <paulus@samba.org>

Merge branch 'for-2.6.26' of master.kernel.org:/pub/scm/linux/kernel/git/jwboyer/powerpc-4xx into merge

On SH7709S, DMAC can be found at 0xa4000020 (as with most of
the other sh3 cpu subtypes).

Split out definition of DMAC base address from definitions of
DMTE irqs.
Signed-off-by: NSteve Glendinning <steve.glendinning@smsc.com>
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

Noticed by Paul Marks <paul@pmarks.net>.
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Follows the se7722 change.
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

This patch increases the headroom TIPC reserves in each sk_buff
to accommodate the largest possible link level device header.
Signed-off-by: NAllan Stephens <allan.stephens@windriver.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Signed-off-by: NSteve French <sfrench@us.ibm.com>

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6: (32 commits)
  net: Added ASSERT_RTNL() to dev_open() and dev_close().
  can: Fix can_send() handling on dev_queue_xmit() failures
  netns: Fix arbitrary net_device-s corruptions on net_ns stop.
  netfilter: Kconfig: default DCCP/SCTP conntrack support to the protocol config values
  netfilter: nf_conntrack_sip: restrict RTP expect flushing on error to last request
  macvlan: Fix memleak on device removal/crash on module removal
  net/ipv4: correct RFC 1122 section reference in comment
  tcp FRTO: SACK variant is errorneously used with NewReno
  e1000e: don't return half-read eeprom on error
  ucc_geth: Don't use RX clock as TX clock.
  cxgb3: Use CAP_SYS_RAWIO for firmware
  pcnet32: delete non NAPI code from driver.
  fs_enet: Fix a memory leak in fs_enet_mdio_probe
  [netdrvr] eexpress: IPv6 fails - multicast problems
  3c59x: use netstats in net_device structure
  3c980-TX needs EXTRA_PREAMBLE
  fix warning in drivers/net/appletalk/cops.c
  e1000e: Add support for BM PHYs on ICH9
  uli526x: fix endianness issues in the setup frame
  uli526x: initialize the hardware prior to requesting interrupts
  ...

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc-2.6:
  sparc: Fix SA_ONSTACK signal handling.

This reverts commit 9f8dacca, which was
reported to break X startup (xf86-video-ati-6.8.0). See

	http://bugs.freedesktop.org/show_bug.cgi?id=15523

for details.
Reported-by: NLaurence Withers <l@lwithers.me.uk>
Cc: Gary Hade <garyhade@us.ibm.com>
Cc: Greg KH <greg@kroah.com>
Cc: Jan Beulich <jbeulich@novell.com>
Cc: "Jun'ichi Nomura" <j-nomura@ce.jp.nec.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Signed-off-by: NIgor Mammedov <niallain@gmail.com>
Signed-off-by: NSteve French <sfrench@us.ibm.com>

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mingo/linux-2.6-sched-fixes

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mingo/linux-2.6-sched-fixes:
  sched: fix weight calculations
  semaphore: fix

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound-2.6:
  [ALSA] soc at91 minor bug fixes
  [ALSA] soc - at91-pcm - Fix line wrapping
  pcspkr: fix dependancies

<linux/sched.h> we included twice.
Signed-off-by: NHuang Weiyi <weiyi.huang@gmail.com>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Removed duplicated include files <linux/ptrace.h> and <linux/seq_file.h> in
fs/proc/task_mmu.c.
Signed-off-by: NHuang Weiyi <weiyi.huang@gmail.com>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Fix allmodconfig build bug introduced in latest -git by commit
7c91f062 ("V4L/DVB(7767): Move tuners to common/tuners"):

  LD      kernel/built-in.o
  LD      drivers/built-in.o
  ld: drivers/media/built-in.o: No such file: No such file or directory

which happens if all media drivers are modular:

  http://redhat.com/~mingo/misc/config-Wed_Apr_30_09_24_48_CEST_2008.bad

In that case there's no obj-y rule connecting all the built-in.o files and
the link tree breaks.

The fix is to add a guaranteed obj-y rule for the core vmlinux to build.
(which results in an empty object file if all media drivers are modular)
Signed-off-by: NIngo Molnar <mingo@elte.hu>
Acked-by: NSam Ravnborg <sam@ravnborg.org>
Signed-off-by: NStephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/roland/infiniband:
  IB/ehca: Wait for async events to finish before destroying QP
  IB/ipath: Fix SDMA error recovery in absence of link status change
  IB/ipath: Need to always request and handle PIO avail interrupts
  IB/ipath: Fix count of packets received by kernel
  IB/ipath: Return the correct opcode for RDMA WRITE with immediate
  IB/ipath: Fix bug that can leave sends disabled after freeze recovery
  IB/ipath: Only increment SSN if WQE is put on send queue
  IB/ipath: Only warn about prototype chip during init
  RDMA/cxgb3: Fix severe limit on userspace memory registration size
  RDMA/cxgb3: Don't add PBL memory to gen_pool in chunks

Make cpu_relax() invoke barrier() to be the same as other arches.
Signed-off-by: NDavid Howells <dhowells@redhat.com>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

* 'for-linus' of git://git.kernel.dk/linux-2.6-block:
  Revert "relay: fix splice problem"
  docbook: fix bio missing parameter
  block: use unitialized_var() in bio_alloc_bioset()
  block: avoid duplicate calls to get_part() in disk stat code
  cfq-iosched: make io priorities inherit CPU scheduling class as well as nice
  block: optimize generic_unplug_device()
  block: get rid of likely/unlikely predictions in merge logic
  vfs: splice remove_suid() cleanup
  cfq-iosched: fix RCU race in the cfq io_context destructor handling
  block: adjust tagging function queue bit locking
  block: sysfs store function needs to grab queue_lock and use queue_flag_*()