1. 09 6月, 2010 1 次提交
    • P
      arch: Implement local64_t · 1996bda2
      Peter Zijlstra 提交于
      On 64bit, local_t is of size long, and thus we make local64_t an alias.
      On 32bit, we fall back to atomic64_t. (architecture can provide optimized
      32-bit version)
      
      (This new facility is to be used by perf events optimizations.)
      Signed-off-by: NPeter Zijlstra <a.p.zijlstra@chello.nl>
      Cc: linux-arch@vger.kernel.org
      Cc: Andrew Morton <akpm@linux-foundation.org>
      Cc: Linus Torvalds <torvalds@linux-foundation.org>
      LKML-Reference: <new-submission>
      Signed-off-by: NIngo Molnar <mingo@elte.hu>
      1996bda2
  2. 28 5月, 2010 1 次提交
  3. 25 5月, 2010 2 次提交
  4. 17 5月, 2010 1 次提交
  5. 14 5月, 2010 1 次提交
  6. 30 3月, 2010 1 次提交
    • T
      include cleanup: Update gfp.h and slab.h includes to prepare for breaking... · 5a0e3ad6
      Tejun Heo 提交于
      include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h
      
      percpu.h is included by sched.h and module.h and thus ends up being
      included when building most .c files.  percpu.h includes slab.h which
      in turn includes gfp.h making everything defined by the two files
      universally available and complicating inclusion dependencies.
      
      percpu.h -> slab.h dependency is about to be removed.  Prepare for
      this change by updating users of gfp and slab facilities include those
      headers directly instead of assuming availability.  As this conversion
      needs to touch large number of source files, the following script is
      used as the basis of conversion.
      
        http://userweb.kernel.org/~tj/misc/slabh-sweep.py
      
      The script does the followings.
      
      * Scan files for gfp and slab usages and update includes such that
        only the necessary includes are there.  ie. if only gfp is used,
        gfp.h, if slab is used, slab.h.
      
      * When the script inserts a new include, it looks at the include
        blocks and try to put the new include such that its order conforms
        to its surrounding.  It's put in the include block which contains
        core kernel includes, in the same order that the rest are ordered -
        alphabetical, Christmas tree, rev-Xmas-tree or at the end if there
        doesn't seem to be any matching order.
      
      * If the script can't find a place to put a new include (mostly
        because the file doesn't have fitting include block), it prints out
        an error message indicating which .h file needs to be added to the
        file.
      
      The conversion was done in the following steps.
      
      1. The initial automatic conversion of all .c files updated slightly
         over 4000 files, deleting around 700 includes and adding ~480 gfp.h
         and ~3000 slab.h inclusions.  The script emitted errors for ~400
         files.
      
      2. Each error was manually checked.  Some didn't need the inclusion,
         some needed manual addition while adding it to implementation .h or
         embedding .c file was more appropriate for others.  This step added
         inclusions to around 150 files.
      
      3. The script was run again and the output was compared to the edits
         from #2 to make sure no file was left behind.
      
      4. Several build tests were done and a couple of problems were fixed.
         e.g. lib/decompress_*.c used malloc/free() wrappers around slab
         APIs requiring slab.h to be added manually.
      
      5. The script was run on all .h files but without automatically
         editing them as sprinkling gfp.h and slab.h inclusions around .h
         files could easily lead to inclusion dependency hell.  Most gfp.h
         inclusion directives were ignored as stuff from gfp.h was usually
         wildly available and often used in preprocessor macros.  Each
         slab.h inclusion directive was examined and added manually as
         necessary.
      
      6. percpu.h was updated not to include slab.h.
      
      7. Build test were done on the following configurations and failures
         were fixed.  CONFIG_GCOV_KERNEL was turned off for all tests (as my
         distributed build env didn't work with gcov compiles) and a few
         more options had to be turned off depending on archs to make things
         build (like ipr on powerpc/64 which failed due to missing writeq).
      
         * x86 and x86_64 UP and SMP allmodconfig and a custom test config.
         * powerpc and powerpc64 SMP allmodconfig
         * sparc and sparc64 SMP allmodconfig
         * ia64 SMP allmodconfig
         * s390 SMP allmodconfig
         * alpha SMP allmodconfig
         * um on x86_64 SMP allmodconfig
      
      8. percpu.h modifications were reverted so that it could be applied as
         a separate patch and serve as bisection point.
      
      Given the fact that I had only a couple of failures from tests on step
      6, I'm fairly confident about the coverage of this conversion patch.
      If there is a breakage, it's likely to be something in one of the arch
      headers which should be easily discoverable easily on most builds of
      the specific arch.
      Signed-off-by: NTejun Heo <tj@kernel.org>
      Guess-its-ok-by: NChristoph Lameter <cl@linux-foundation.org>
      Cc: Ingo Molnar <mingo@redhat.com>
      Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
      5a0e3ad6
  7. 13 3月, 2010 5 次提交
    • J
      mn10300: Convert mn10300 to use read/update_persistent_clock · f7a56575
      John Stultz 提交于
      This patch converts the mn10300 architecture to use the generic
      read_persistent_clock and update_persistent_clock interfaces, reducing
      the amount of arch specific code we have to maintain, and allowing for
      further cleanups in the future.
      
      I have not built or tested this patch, so help from arch maintainers
      would be appreciated.
      Signed-off-by: NJohn Stultz <johnstul@us.ibm.com>
      Cc: David Howells <dhowells@redhat.com>
      Cc: Koichi Yasutake <yasutake.koichi@jp.panasonic.com>
      Cc: Andrew Morton <akpm@linux-foundation.org>
      LKML-Reference: <1267675049-12337-3-git-send-email-johnstul@us.ibm.com>
      Signed-off-by: NThomas Gleixner <tglx@linutronix.de>
      f7a56575
    • F
      dma-mapping: mn10300: remove the obsolete and unnecessary DMA API comments · 06db881b
      FUJITA Tomonori 提交于
      pci_dma_sync_single was obsoleted long ago.
      
      All the comments are generic, not architecture specific, simply describes
      some of the DMA-API (and the same comments are in other files).
      Documentation/DMA-API.txt have more detailed descriptions.
      
      This removes the above obsolete and unnecessary DMA API
      comments. Let's describe the DMA API in only
      Documentation/DMA-API.txt.
      Signed-off-by: NFUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
      Cc: David Howells <dhowells@redhat.com>
      Cc: Koichi Yasutake <yasutake.koichi@jp.panasonic.com>
      Cc: Jesse Barnes <jbarnes@virtuousgeek.org>
      Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
      06db881b
    • C
      ptrace: move user_enable_single_step & co prototypes to linux/ptrace.h · dacbe41f
      Christoph Hellwig 提交于
      While in theory user_enable_single_step/user_disable_single_step/
      user_enable_blockstep could also be provided as an inline or macro there's
      no good reason to do so, and having the prototype in one places keeps code
      size and confusion down.
      
      Roland said:
      
        The original thought there was that user_enable_single_step() et al
        might well be only an instruction or three on a sane machine (as if we
        have any of those!), and since there is only one call site inlining
        would be beneficial.  But I agree that there is no strong reason to care
        about inlining it.
      
        As to the arch changes, there is only one thought I'd add to the
        record.  It was always my thinking that for an arch where
        PTRACE_SINGLESTEP does text-modifying breakpoint insertion,
        user_enable_single_step() should not be provided.  That is,
        arch_has_single_step()=>true means that there is an arch facility with
        "pure" semantics that does not have any unexpected side effects.
        Inserting a breakpoint might do very unexpected strange things in
        multi-threaded situations.  Aside from that, it is a peculiar side
        effect that user_{enable,disable}_single_step() should cause COW
        de-sharing of text pages and so forth.  For PTRACE_SINGLESTEP, all these
        peculiarities are the status quo ante for that arch, so having
        arch_ptrace() itself do those is one thing.  But for building other
        things in the future, it is nicer to have a uniform "pure" semantics
        that arch-independent code can expect.
      
        OTOH, all such arch issues are really up to the arch maintainer.  As
        of today, there is nothing but ptrace using user_enable_single_step() et
        al so it's a distinction without a practical difference.  If/when there
        are other facilities that use user_enable_single_step() and might care,
        the affected arch's can revisit the question when someone cares about
        the quality of the arch support for said new facility.
      Signed-off-by: NChristoph Hellwig <hch@lst.de>
      Cc: Oleg Nesterov <oleg@redhat.com>
      Cc: Roland McGrath <roland@redhat.com>
      Acked-by: NDavid Howells <dhowells@redhat.com>
      Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
      dacbe41f
    • C
      Add generic sys_ipc wrapper · baed7fc9
      Christoph Hellwig 提交于
      Add a generic implementation of the ipc demultiplexer syscall.  Except for
      s390 and sparc64 all implementations of the sys_ipc are nearly identical.
      
      There are slight differences in the types of the parameters, where mips
      and powerpc as the only 64-bit architectures with sys_ipc use unsigned
      long for the "third" argument as it gets casted to a pointer later, while
      it traditionally is an "int" like most other paramters.  frv goes even
      further and uses unsigned long for all parameters execept for "ptr" which
      is a pointer type everywhere.  The change from int to unsigned long for
      "third" and back to "int" for the others on frv should be fine due to the
      in-register calling conventions for syscalls (we already had a similar
      issue with the generic sys_ptrace), but I'd prefer to have the arch
      maintainers looks over this in details.
      
      Except for that h8300, m68k and m68knommu lack an impplementation of the
      semtimedop sub call which this patch adds, and various architectures have
      gets used - at least on i386 it seems superflous as the compat code on
      x86-64 and ia64 doesn't even bother to implement it.
      
      [akpm@linux-foundation.org: add sys_ipc to sys_ni.c]
      Signed-off-by: NChristoph Hellwig <hch@lst.de>
      Cc: Ralf Baechle <ralf@linux-mips.org>
      Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
      Cc: Paul Mundt <lethal@linux-sh.org>
      Cc: Jeff Dike <jdike@addtoit.com>
      Cc: Hirokazu Takata <takata@linux-m32r.org>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: Ingo Molnar <mingo@elte.hu>
      Reviewed-by: NH. Peter Anvin <hpa@zytor.com>
      Cc: Al Viro <viro@zeniv.linux.org.uk>
      Cc: Arnd Bergmann <arnd@arndb.de>
      Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
      Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
      Cc: "Luck, Tony" <tony.luck@intel.com>
      Cc: James Morris <jmorris@namei.org>
      Cc: Andreas Schwab <schwab@linux-m68k.org>
      Acked-by: NJesper Nilsson <jesper.nilsson@axis.com>
      Acked-by: NRussell King <rmk+kernel@arm.linux.org.uk>
      Acked-by: NDavid Howells <dhowells@redhat.com>
      Acked-by: NKyle McMartin <kyle@mcmartin.ca>
      Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
      baed7fc9
    • C
      Add generic sys_old_select() · 5d0e5283
      Christoph Hellwig 提交于
      Add a generic implementation of the old select() syscall, which expects
      its argument in a memory block and switch all architectures over to use
      it.
      Signed-off-by: NChristoph Hellwig <hch@lst.de>
      Cc: Ralf Baechle <ralf@linux-mips.org>
      Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
      Cc: Paul Mundt <lethal@linux-sh.org>
      Cc: Jeff Dike <jdike@addtoit.com>
      Cc: Hirokazu Takata <takata@linux-m32r.org>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: Ingo Molnar <mingo@elte.hu>
      Reviewed-by: NH. Peter Anvin <hpa@zytor.com>
      Cc: Al Viro <viro@zeniv.linux.org.uk>
      Cc: Arnd Bergmann <arnd@arndb.de>
      Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
      Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
      Cc: "Luck, Tony" <tony.luck@intel.com>
      Cc: James Morris <jmorris@namei.org>
      Acked-by: NAndreas Schwab <schwab@linux-m68k.org>
      Acked-by: NRussell King <rmk+kernel@arm.linux.org.uk>
      Acked-by: NGreg Ungerer <gerg@uclinux.org>
      Acked-by: NDavid Howells <dhowells@redhat.com>
      Cc: Andreas Schwab <schwab@linux-m68k.org>
      Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
      5d0e5283
  8. 24 2月, 2010 1 次提交
  9. 23 2月, 2010 2 次提交
  10. 21 2月, 2010 1 次提交
    • R
      MM: Pass a PTE pointer to update_mmu_cache() rather than the PTE itself · 4b3073e1
      Russell King 提交于
      On VIVT ARM, when we have multiple shared mappings of the same file
      in the same MM, we need to ensure that we have coherency across all
      copies.  We do this via make_coherent() by making the pages
      uncacheable.
      
      This used to work fine, until we allowed highmem with highpte - we
      now have a page table which is mapped as required, and is not available
      for modification via update_mmu_cache().
      
      Ralf Beache suggested getting rid of the PTE value passed to
      update_mmu_cache():
      
        On MIPS update_mmu_cache() calls __update_tlb() which walks pagetables
        to construct a pointer to the pte again.  Passing a pte_t * is much
        more elegant.  Maybe we might even replace the pte argument with the
        pte_t?
      
      Ben Herrenschmidt would also like the pte pointer for PowerPC:
      
        Passing the ptep in there is exactly what I want.  I want that
        -instead- of the PTE value, because I have issue on some ppc cases,
        for I$/D$ coherency, where set_pte_at() may decide to mask out the
        _PAGE_EXEC.
      
      So, pass in the mapped page table pointer into update_mmu_cache(), and
      remove the PTE value, updating all implementations and call sites to
      suit.
      
      Includes a fix from Stephen Rothwell:
      
        sparc: fix fallout from update_mmu_cache API change
      Signed-off-by: NStephen Rothwell <sfr@canb.auug.org.au>
      Acked-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
      Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
      4b3073e1
  11. 12 1月, 2010 11 次提交
  12. 16 12月, 2009 1 次提交
  13. 15 12月, 2009 1 次提交
  14. 12 12月, 2009 1 次提交
  15. 11 12月, 2009 2 次提交
  16. 26 11月, 2009 1 次提交
    • I
      block: add helpers to run flush_dcache_page() against a bio and a request's pages · 2d4dc890
      Ilya Loginov 提交于
      Mtdblock driver doesn't call flush_dcache_page for pages in request.  So,
      this causes problems on architectures where the icache doesn't fill from
      the dcache or with dcache aliases.  The patch fixes this.
      
      The ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE symbol was introduced to avoid
      pointless empty cache-thrashing loops on architectures for which
      flush_dcache_page() is a no-op.  Every architecture was provided with this
      flush pages on architectires where ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE is
      equal 1 or do nothing otherwise.
      
      See "fix mtd_blkdevs problem with caches on some architectures" discussion
      on LKML for more information.
      Signed-off-by: NIlya Loginov <isloginov@gmail.com>
      Cc: Ingo Molnar <mingo@elte.hu>
      Cc: David Woodhouse <dwmw2@infradead.org>
      Cc: Peter Horton <phorton@bitbox.co.uk>
      Cc: "Ed L. Cashin" <ecashin@coraid.com>
      Signed-off-by: NJens Axboe <jens.axboe@oracle.com>
      2d4dc890
  17. 29 10月, 2009 1 次提交
    • T
      percpu: make misc percpu symbols unique · 390dfd95
      Tejun Heo 提交于
      This patch updates misc percpu related symbols such that percpu
      symbols are unique and don't clash with local symbols.  This serves
      two purposes of decreasing the possibility of global percpu symbol
      collision and allowing dropping per_cpu__ prefix from percpu symbols.
      
      * drivers/crypto/padlock-aes.c: s/last_cword/paes_last_cword/
      
      * drivers/lguest/x86/core.c: s/last_cpu/lg_last_cpu/
      
      * drivers/s390/net/netiucv.c: rename the variable used in a macro to
        avoid clashing with percpu symbol
      
      * arch/mn10300/kernel/kprobes.c: replace current_ prefix with cur_ for
        static variables.  Please note that percpu symbol current_kprobe
        can't be changed as it's used by generic code.
      
      Partly based on Rusty Russell's "alloc_percpu: rename percpu vars
      which cause name clashes" patch.
      Signed-off-by: NTejun Heo <tj@kernel.org>
      Reviewed-by: NChristoph Lameter <cl@linux-foundation.org>
      Cc: Rusty Russell <rusty@rustcorp.com.au>
      Cc: Herbert Xu <herbert@gondor.apana.org.au>
      Cc: Chuck Ebbert <cebbert@redhat.com>
      Cc: David Howells <dhowells@redhat.com>
      Cc: Koichi Yasutake <yasutake.koichi@jp.panasonic.com>
      Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
      Cc: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
      Cc: David S. Miller <davem@davemloft.net>
      Cc: Masami Hiramatsu <mhiramat@redhat.com>
      Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
      Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
      Cc: linux390@de.ibm.com
      390dfd95
  18. 14 10月, 2009 1 次提交
  19. 13 10月, 2009 1 次提交
    • N
      net: Generalize socket rx gap / receive queue overflow cmsg · 3b885787
      Neil Horman 提交于
      Create a new socket level option to report number of queue overflows
      
      Recently I augmented the AF_PACKET protocol to report the number of frames lost
      on the socket receive queue between any two enqueued frames.  This value was
      exported via a SOL_PACKET level cmsg.  AFter I completed that work it was
      requested that this feature be generalized so that any datagram oriented socket
      could make use of this option.  As such I've created this patch, It creates a
      new SOL_SOCKET level option called SO_RXQ_OVFL, which when enabled exports a
      SOL_SOCKET level cmsg that reports the nubmer of times the sk_receive_queue
      overflowed between any two given frames.  It also augments the AF_PACKET
      protocol to take advantage of this new feature (as it previously did not touch
      sk->sk_drops, which this patch uses to record the overflow count).  Tested
      successfully by me.
      
      Notes:
      
      1) Unlike my previous patch, this patch simply records the sk_drops value, which
      is not a number of drops between packets, but rather a total number of drops.
      Deltas must be computed in user space.
      
      2) While this patch currently works with datagram oriented protocols, it will
      also be accepted by non-datagram oriented protocols. I'm not sure if thats
      agreeable to everyone, but my argument in favor of doing so is that, for those
      protocols which aren't applicable to this option, sk_drops will always be zero,
      and reporting no drops on a receive queue that isn't used for those
      non-participating protocols seems reasonable to me.  This also saves us having
      to code in a per-protocol opt in mechanism.
      
      3) This applies cleanly to net-next assuming that commit
      97775007 (my af packet cmsg patch) is reverted
      Signed-off-by: NNeil Horman <nhorman@tuxdriver.com>
      Signed-off-by: NEric Dumazet <eric.dumazet@gmail.com>
      Signed-off-by: NDavid S. Miller <davem@davemloft.net>
      3b885787
  20. 02 10月, 2009 1 次提交
    • M
      mn10300: fix kernel build failures when using gcc-4.x · d22a001b
      Mark Salter 提交于
      Fix some build failures when using gcc-4.x for MN10300.
      
      Firstly, __get_user() fails to build because the pointer points to a const and
      __gu_val ends up being read-only:
      
      In file included from include/linux/mempolicy.h:62,
                       from init/main.c:50:
      include/linux/pagemap.h: In function 'fault_in_pages_readable':
      include/linux/pagemap.h:394: error: read-only variable '__gu_val' used as 'asm' output
      include/linux/pagemap.h:394: error: read-only variable '__gu_val' used as 'asm' output
      include/linux/pagemap.h:394: error: read-only variable '__gu_val' used as 'asm' output
      include/linux/pagemap.h:400: error: read-only variable '__gu_val' used as 'asm' output
      include/linux/pagemap.h:400: error: read-only variable '__gu_val' used as 'asm' output
      include/linux/pagemap.h:400: error: read-only variable '__gu_val' used as 'asm' output
      make[1]: *** [init/main.o] Error 1
      
      Secondly, gcc-4 doesn't allow casts of lvalues:
      
        UPD     include/linux/compile.h
      arch/mn10300/kernel/rtc.c: In function 'calibrate_clock':
      arch/mn10300/kernel/rtc.c:170: error: lvalue required as left operand of assignment
      arch/mn10300/kernel/rtc.c:172: error: lvalue required as left operand of assignment
      make[1]: *** [arch/mn10300/kernel/rtc.o] Error 1
      
      These are seen with gcc 4.2.1.
      Signed-off-by: NMark Salter <msalter@redhat.com>
      Signed-off-by: NDavid Howells <dhowells@redhat.com>
      Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
      d22a001b
  21. 25 9月, 2009 1 次提交
  22. 24 9月, 2009 2 次提交