Eric Lee / smarc-fsl-linux-kernel

16 Dec, 2005

2 commits

14 Nov, 2005

2 commits

  • 8426e1f6a   [PATCH] atomic: inc_not_zero ... Browse Code »

    Introduce an atomic_inc_not_zero operation. Make this a special case of
    atomic_add_unless because lockless pagecache actually wants
    atomic_inc_not_negativeone due to its offset refcount.

    Signed-off-by: Nick Piggin
    Cc: "Paul E. McKenney"
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Nick Piggin
     
  • 4a6dae6d3   [PATCH] atomic: cmpxchg ... Browse Code »

    Introduce an atomic_cmpxchg operation.

    Signed-off-by: Nick Piggin
    Cc: "Paul E. McKenney"
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Nick Piggin
     

08 Nov, 2005

4 commits

07 Nov, 2005

1 commit

  • 481bed454   [PATCH] consolidate sys_ptrace() ... Browse Code »

    The sys_ptrace boilerplate code (everything outside the big switch
    statement for the arch-specific requests) is shared by most architectures.
    This patch moves it to kernel/ptrace.c and leaves the arch-specific code as
    arch_ptrace.

    Some architectures have a too different ptrace so we have to exclude them.
    They continue to keep their implementations. For sh64 I had to add a
    sh64_ptrace wrapper because it does some initialization on the first call.
    For um I removed an ifdefed SUBARCH_PTRACE_SPECIAL block, but
    SUBARCH_PTRACE_SPECIAL isn't defined anywhere in the tree.

    Signed-off-by: Christoph Hellwig
    Acked-by: Paul Mackerras
    Acked-by: Ralf Baechle
    Acked-By: David Howells
    Acked-by: Russell King
    Acked-by: Paul Mundt
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Christoph Hellwig
     

31 Oct, 2005

3 commits

  • 727a53bd5   [PATCH] semaphore: Remove __MUTEX_INITIALIZER() ... Browse Code »

    __MUTEX_INITIALIZER() has no users, and equates to the more commonly used
    DECLARE_MUTEX(), thus making it pretty much redundant. Remove it for good.

    Signed-off-by: Arthur Othieno
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Arthur Othieno
     
  • 1426d7a81   [PATCH] vm: remove unused/broken page_pte[_prot] macros ... Browse Code »

    This patch removes page_pte_prot and page_pte macros from all
    architectures. Some architectures define both, some only page_pte (broken)
    and others none. These macros are not used anywhere.

    page_pte_prot(page, prot) is identical to mk_pte(page, prot) and
    page_pte(page) is identical to page_pte_prot(page, __pgprot(0)).

    * The following architectures define both page_pte_prot and page_pte

    arm, arm26, ia64, sh64, sparc, sparc64

    * The following architectures define only page_pte (broken)

    frv, i386, m32r, mips, sh, x86-64

    * All other architectures define neither

    Signed-off-by: Tejun Heo
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Tejun Heo
     
  • d61780c0d   [PATCH] remove some more check_region stuff ... Browse Code »

    Removed some more references to check_region().

    I checked these changes into the 'checkreg' branch of
    rsync://rsync.kernel.org/pub/scm/linux/kernel/git/jgarzik/misc-2.6.git

    The only valid references remaining are in:
    drivers/scsi/advansys.c
    drivers/scsi/BusLogic.c
    drivers/cdrom/sbpcd.c
    sound/oss/pss.c

    Remove last vestiges of ide_check_region()
    drivers/char/specialix: trim trailing whitespace
    drivers/char/specialix: eliminate use of check_region()
    Remove outdated and unused references to check_region()
    [sound oss] remove check_region() usage from cs4232, wavfront
    [netdrvr eepro] trim trailing whitespace
    [netdrvr eepro] remove check_region() usage

    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Jeff Garzik
     

28 Oct, 2005

1 commit

05 Oct, 2005

1 commit

  • 329d4dd72   [PATCH] fix the breakage in sparc headers ... Browse Code »

    If we switch extern inline to static inline, we'd better switch the
    pre-declarations we use to say that these puppies have
    __attribute_const__ on them.

    Otherwise we get extern declaration followed by static inline one.
    Which makes gcc unhappy, and for a good reason...

    Signed-off-by: Al Viro
    Signed-off-by: David S. Miller
    Signed-off-by: Linus Torvalds

    Al Viro
     

04 Oct, 2005

1 commit

29 Sep, 2005

1 commit

22 Sep, 2005

1 commit

  • 676067cfe   [PATCH] Remove unused var from asm/futex.h ... Browse Code »

    As recently done by Russell King for ARM, commit
    4732efbeb997189d9f9b04708dc26bf8613ed721 introduces a generic asm/futex.h copied
    along most arches, which includes a "-ENOSYS support" to be changed if needed.
    However, it includes an unused var (taken from the "real" version) which GCC
    warns about.

    Remove it from all arches having that file version (i.e. same GIT id).
    $ git-diff-tree -r HEAD
    and
    $ git-ls-tree -r HEAD include/|grep 9feff4ce1424bc390608326240be369eb13aa648

    may be more interesting than looking at the patch itself, to make sure I've
    just copied the arm header to all other archs having the original dummy version
    of this file.

    Cc: Jakub Jelinek
    Signed-off-by: Paolo 'Blaisorblade' Giarrusso
    Signed-off-by: Linus Torvalds

    Paolo 'Blaisorblade' Giarrusso
     

11 Sep, 2005

1 commit

  • fb1c8f93d   [PATCH] spinlock consolidation ... Browse Code »

    This patch (written by me and also containing many suggestions of Arjan van
    de Ven) does a major cleanup of the spinlock code. It does the following
    things:

    - consolidates and enhances the spinlock/rwlock debugging code

    - simplifies the asm/spinlock.h files

    - encapsulates the raw spinlock type and moves generic spinlock
    features (such as ->break_lock) into the generic code.

    - cleans up the spinlock code hierarchy to get rid of the spaghetti.

    Most notably there's now only a single variant of the debugging code,
    located in lib/spinlock_debug.c. (previously we had one SMP debugging
    variant per architecture, plus a separate generic one for UP builds)

    Also, i've enhanced the rwlock debugging facility, it will now track
    write-owners. There is new spinlock-owner/CPU-tracking on SMP builds too.
    All locks have lockup detection now, which will work for both soft and hard
    spin/rwlock lockups.

    The arch-level include files now only contain the minimally necessary
    subset of the spinlock code - all the rest that can be generalized now
    lives in the generic headers:

    include/asm-i386/spinlock_types.h | 16
    include/asm-x86_64/spinlock_types.h | 16

    I have also split up the various spinlock variants into separate files,
    making it easier to see which does what. The new layout is:

    SMP | UP
    ----------------------------|-----------------------------------
    asm/spinlock_types_smp.h | linux/spinlock_types_up.h
    linux/spinlock_types.h | linux/spinlock_types.h
    asm/spinlock_smp.h | linux/spinlock_up.h
    linux/spinlock_api_smp.h | linux/spinlock_api_up.h
    linux/spinlock.h | linux/spinlock.h

    /*
    * here's the role of the various spinlock/rwlock related include files:
    *
    * on SMP builds:
    *
    * asm/spinlock_types.h: contains the raw_spinlock_t/raw_rwlock_t and the
    * initializers
    *
    * linux/spinlock_types.h:
    * defines the generic type and initializers
    *
    * asm/spinlock.h: contains the __raw_spin_*()/etc. lowlevel
    * implementations, mostly inline assembly code
    *
    * (also included on UP-debug builds:)
    *
    * linux/spinlock_api_smp.h:
    * contains the prototypes for the _spin_*() APIs.
    *
    * linux/spinlock.h: builds the final spin_*() APIs.
    *
    * on UP builds:
    *
    * linux/spinlock_type_up.h:
    * contains the generic, simplified UP spinlock type.
    * (which is an empty structure on non-debug builds)
    *
    * linux/spinlock_types.h:
    * defines the generic type and initializers
    *
    * linux/spinlock_up.h:
    * contains the __raw_spin_*()/etc. version of UP
    * builds. (which are NOPs on non-debug, non-preempt
    * builds)
    *
    * (included on UP-non-debug builds:)
    *
    * linux/spinlock_api_up.h:
    * builds the _spin_*() APIs.
    *
    * linux/spinlock.h: builds the final spin_*() APIs.
    */

    All SMP and UP architectures are converted by this patch.

    arm, i386, ia64, ppc, ppc64, s390/s390x, x64 was build-tested via
    crosscompilers. m32r, mips, sh, sparc, have not been tested yet, but should
    be mostly fine.

    From: Grant Grundler

    Booted and lightly tested on a500-44 (64-bit, SMP kernel, dual CPU).
    Builds 32-bit SMP kernel (not booted or tested). I did not try to build
    non-SMP kernels. That should be trivial to fix up later if necessary.

    I converted bit ops atomic_hash lock to raw_spinlock_t. Doing so avoids
    some ugly nesting of linux/*.h and asm/*.h files. Those particular locks
    are well tested and contained entirely inside arch specific code. I do NOT
    expect any new issues to arise with them.

    If someone does ever need to use debug/metrics with them, then they will
    need to unravel this hairball between spinlocks, atomic ops, and bit ops
    that exist only because parisc has exactly one atomic instruction: LDCW
    (load and clear word).

    From: "Luck, Tony"

    ia64 fix

    Signed-off-by: Ingo Molnar
    Signed-off-by: Arjan van de Ven
    Signed-off-by: Grant Grundler
    Cc: Matthew Wilcox
    Signed-off-by: Hirokazu Takata
    Signed-off-by: Mikael Pettersson
    Signed-off-by: Benoit Boissinot
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Ingo Molnar
     

10 Sep, 2005

1 commit

08 Sep, 2005

9 commits

  • 8d286aa5e   [PATCH] Clean up struct flock64 definitions ... Browse Code »

    This patch gathers all the struct flock64 definitions (and the operations),
    puts them under !CONFIG_64BIT and cleans up the arch files.

    Signed-off-by: Stephen Rothwell
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Stephen Rothwell
     
  • 5ac353f9b   [PATCH] Clean up struct flock definitions ... Browse Code »

    This patch just gathers together all the struct flock definitions except
    xtensa into asm-generic/fcntl.h.

    Signed-off-by: Stephen Rothwell
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Stephen Rothwell
     
  • 1abf62afb   [PATCH] Clean up the fcntl operations ... Browse Code »

    This patch puts the most popular of each fcntl operation/flag into
    asm-generic/fcntl.h and cleans up the arch files.

    Signed-off-by: Stephen Rothwell
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Stephen Rothwell
     
  • e64ca97fd   [PATCH] Clean up the open flags ... Browse Code »

    This patch puts the most popular of each open flag into asm-generic/fcntl.h
    and cleans up the arch files.

    Signed-off-by: Stephen Rothwell
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Stephen Rothwell
     
  • 9317259ea   [PATCH] Create asm-generic/fcntl.h ... Browse Code »

    This set of patches creates asm-generic/fcntl.h and consolidates as much as
    possible from the asm-*/fcntl.h files into it.

    This patch just gathers all the identical bits of the asm-*/fcntl.h files into
    asm-generic/fcntl.h.

    Signed-off-by: Stephen Rothwell
    Signed-off-by: Yoichi Yuasa
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Stephen Rothwell
     
  • 97de50c0a   [PATCH] remove verify_area(): remove verify_area() from various uaccess.h headers ... Browse Code »

    Remove the deprecated (and unused) verify_area() from various uaccess.h
    headers.

    Signed-off-by: Jesper Juhl
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Jesper Juhl
     
  • c8d127418   [PATCH] remove asm-*/hdreg.h ... Browse Code »

    unused and useless..

    Signed-off-by: Christoph Hellwig
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Christoph Hellwig
     
  • 36d57ac4a   [PATCH] auxiliary vector cleanups ... Browse Code »

    The size of auxiliary vector is fixed at 42 in linux/sched.h. But it isn't
    very obvious when looking at linux/elf.h. This patch adds AT_VECTOR_SIZE
    so that we can change it if necessary when a new vector is added.

    Because of include file ordering problems, doing this necessitated the
    extraction of the AT_* symbols into a standalone header file.

    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    H. J. Lu
     
  • 4732efbeb   [PATCH] FUTEX_WAKE_OP: pthread_cond_signal() speedup ... Browse Code »

    ATM pthread_cond_signal is unnecessarily slow, because it wakes one waiter
    (which at least on UP usually means an immediate context switch to one of
    the waiter threads). This waiter wakes up and after a few instructions it
    attempts to acquire the cv internal lock, but that lock is still held by
    the thread calling pthread_cond_signal. So it goes to sleep and eventually
    the signalling thread is scheduled in, unlocks the internal lock and wakes
    the waiter again.

    Now, before 2003-09-21 NPTL was using FUTEX_REQUEUE in pthread_cond_signal
    to avoid this performance issue, but it was removed when locks were
    redesigned to the 3 state scheme (unlocked, locked uncontended, locked
    contended).

    Following scenario shows why simply using FUTEX_REQUEUE in
    pthread_cond_signal together with using lll_mutex_unlock_force in place of
    lll_mutex_unlock is not enough and probably why it has been disabled at
    that time:

    The number is value in cv->__data.__lock.
    thr1 thr2 thr3
    0 pthread_cond_wait
    1 lll_mutex_lock (cv->__data.__lock)
    0 lll_mutex_unlock (cv->__data.__lock)
    0 lll_futex_wait (&cv->__data.__futex, futexval)
    0 pthread_cond_signal
    1 lll_mutex_lock (cv->__data.__lock)
    1 pthread_cond_signal
    2 lll_mutex_lock (cv->__data.__lock)
    2 lll_futex_wait (&cv->__data.__lock, 2)
    2 lll_futex_requeue (&cv->__data.__futex, 0, 1, &cv->__data.__lock)
    # FUTEX_REQUEUE, not FUTEX_CMP_REQUEUE
    2 lll_mutex_unlock_force (cv->__data.__lock)
    0 cv->__data.__lock = 0
    0 lll_futex_wake (&cv->__data.__lock, 1)
    1 lll_mutex_lock (cv->__data.__lock)
    0 lll_mutex_unlock (cv->__data.__lock)
    # Here, lll_mutex_unlock doesn't know there are threads waiting
    # on the internal cv's lock

    Now, I believe it is possible to use FUTEX_REQUEUE in pthread_cond_signal,
    but it will cost us not one, but 2 extra syscalls and, what's worse, one of
    these extra syscalls will be done for every single waiting loop in
    pthread_cond_*wait.

    We would need to use lll_mutex_unlock_force in pthread_cond_signal after
    requeue and lll_mutex_cond_lock in pthread_cond_*wait after lll_futex_wait.

    Another alternative is to do the unlocking pthread_cond_signal needs to do
    (the lock can't be unlocked before lll_futex_wake, as that is racy) in the
    kernel.

    I have implemented both variants, futex-requeue-glibc.patch is the first
    one and futex-wake_op{,-glibc}.patch is the unlocking inside of the kernel.
    The kernel interface allows userland to specify how exactly an unlocking
    operation should look like (some atomic arithmetic operation with optional
    constant argument and comparison of the previous futex value with another
    constant).

    It has been implemented just for ppc*, x86_64 and i?86, for other
    architectures I'm including just a stub header which can be used as a
    starting point by maintainers to write support for their arches and ATM
    will just return -ENOSYS for FUTEX_WAKE_OP. The requeue patch has been
    (lightly) tested just on x86_64, the wake_op patch on ppc64 kernel running
    32-bit and 64-bit NPTL and x86_64 kernel running 32-bit and 64-bit NPTL.

    With the following benchmark on UP x86-64 I get:

    for i in nptl-orig nptl-requeue nptl-wake_op; do echo time elf/ld.so --library-path .:$i /tmp/bench; \
    for j in 1 2; do echo ( time elf/ld.so --library-path .:$i /tmp/bench ) 2>&1; done; done
    time elf/ld.so --library-path .:nptl-orig /tmp/bench
    real 0m0.655s user 0m0.253s sys 0m0.403s
    real 0m0.657s user 0m0.269s sys 0m0.388s
    time elf/ld.so --library-path .:nptl-requeue /tmp/bench
    real 0m0.496s user 0m0.225s sys 0m0.271s
    real 0m0.531s user 0m0.242s sys 0m0.288s
    time elf/ld.so --library-path .:nptl-wake_op /tmp/bench
    real 0m0.380s user 0m0.176s sys 0m0.204s
    real 0m0.382s user 0m0.175s sys 0m0.207s

    The benchmark is at:
    http://sourceware.org/ml/libc-alpha/2005-03/txt00001.txt
    Older futex-requeue-glibc.patch version is at:
    http://sourceware.org/ml/libc-alpha/2005-03/txt00002.txt
    Older futex-wake_op-glibc.patch version is at:
    http://sourceware.org/ml/libc-alpha/2005-03/txt00003.txt
    Will post a new version (just x86-64 fixes so that the patch
    applies against pthread_cond_signal.S) to libc-hacker ml soon.

    Attached is the kernel FUTEX_WAKE_OP patch as well as a simple-minded
    testcase that will not test the atomicity of the operation, but at least
    check if the threads that should have been woken up are woken up and
    whether the arithmetic operation in the kernel gave the expected results.

    Acked-by: Ingo Molnar
    Cc: Ulrich Drepper
    Cc: Jamie Lokier
    Cc: Rusty Russell
    Signed-off-by: Yoichi Yuasa
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Jakub Jelinek
     

05 Sep, 2005

3 commits

02 Sep, 2005

1 commit

30 Aug, 2005

2 commits

28 Jul, 2005

1 commit

27 Jul, 2005

1 commit

  • 7c9034735   [PATCH] Add emergency_restart() ... Browse Code »

    When the kernel is working well and we want to restart cleanly
    kernel_restart is the function to use. But in many instances
    the kernel wants to reboot when thing are expected to be working
    very badly such as from panic or a software watchdog handler.

    This patch adds the function emergency_restart() so that
    callers can be clear what semantics they expect when calling
    restart. emergency_restart() is expected to be callable
    from interrupt context and possibly reliable in even more
    trying circumstances.

    This is an initial generic implementation for all architectures.

    Signed-off-by: Eric W. Biederman
    Signed-off-by: Linus Torvalds

    Eric W. Biederman
     

13 Jul, 2005

1 commit

12 Jul, 2005

1 commit

11 Jul, 2005

1 commit

28 Jun, 2005

1 commit

  • bb4a61b6e   [PATCH] PCI: fix up errors after dma bursting patch and CONFIG_PCI=n ... Browse Code »

    With CONFIG_PCI=n:

    In file included from include/linux/pci.h:917,
    from lib/iomap.c:6:
    include/asm/pci.h:104: warning: `enum pci_dma_burst_strategy' declared inside parameter list
    include/asm/pci.h:104: warning: its scope is only this definition or declaration, which is probably not what you want.
    include/asm/pci.h: In function `pci_dma_burst_advice':
    include/asm/pci.h:106: dereferencing pointer to incomplete type
    include/asm/pci.h:106: `PCI_DMA_BURST_INFINITY' undeclared (first use in this function)
    include/asm/pci.h:106: (Each undeclared identifier is reported only once
    include/asm/pci.h:106: for each function it appears in.)
    make[1]: *** [lib/iomap.o] Error 1

    Signed-off-by: Andrew Morton
    Signed-off-by: Greg Kroah-Hartman

    Andrew Morton