Eric Lee / smarc-ti-linux-kernel

26 Jun, 2013

1 commit

  • a41b56efa   arch: Make __mutex_fastpath_lock_retval return whether fastpath succeeded or not ... Browse Code »

    This will allow me to call functions that have multiple
    arguments if fastpath fails. This is required to support ticket
    mutexes, because they need to be able to pass an extra argument
    to the fail function.

    Originally I duplicated the functions, by adding
    __mutex_fastpath_lock_retval_arg. This ended up being just a
    duplication of the existing function, so a way to test if
    fastpath was called ended up being better.

    This also cleaned up the reservation mutex patch some by being
    able to call an atomic_set instead of atomic_xchg, and making it
    easier to detect if the wrong unlock function was previously
    used.

    Signed-off-by: Maarten Lankhorst
    Acked-by: Peter Zijlstra
    Cc: dri-devel@lists.freedesktop.org
    Cc: linaro-mm-sig@lists.linaro.org
    Cc: robclark@gmail.com
    Cc: rostedt@goodmis.org
    Cc: daniel@ffwll.ch
    Cc: Linus Torvalds
    Cc: Andrew Morton
    Cc: Thomas Gleixner
    Link: http://lkml.kernel.org/r/20130620113105.4001.83929.stgit@patser
    Signed-off-by: Ingo Molnar

    Maarten Lankhorst
     

24 Oct, 2008

1 commit

  • a8ddac7e5   mutex: speed up generic mutex implementations ... Browse Code »

    - atomic operations which both modify the variable and return something imply
    full smp memory barriers before and after the memory operations involved
    (failing atomic_cmpxchg, atomic_add_unless, etc don't imply a barrier because
    they don't modify the target). See Documentation/atomic_ops.txt.
    So remove extra barriers and branches.

    - All architectures support atomic_cmpxchg. This has no relation to
    __HAVE_ARCH_CMPXCHG. We can just take the atomic_cmpxchg path unconditionally

    This reduces a simple single threaded fastpath lock+unlock test from 590 cycles
    to 203 cycles on a ppc970 system.

    Signed-off-by: Nick Piggin
    Signed-off-by: Linus Torvalds

    Nick Piggin
     

09 Feb, 2008

1 commit

04 Oct, 2006

1 commit

01 Apr, 2006

1 commit

  • e358c1a2c   [PATCH] mutex: some cleanups ... Browse Code »

    Turn some macros into inline functions and add proper type checking as
    well as being more readable. Also a minor comment adjustment.

    Signed-off-by: Nicolas Pitre
    Acked-by: Ingo Molnar
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Nicolas Pitre
     

12 Jan, 2006

1 commit

10 Jan, 2006

1 commit

  • 620a6fd18   [PATCH] mutex subsystem, add asm-generic/mutex-[dec|xchg|null].h implementations ... Browse Code »

    Add three (generic) mutex fastpath implementations.

    The mutex-xchg.h implementation is atomic_xchg() based, and should
    work fine on every architecture.

    The mutex-dec.h implementation is atomic_dec_return() based - this
    one too should work on every architecture, but might not perform the
    most optimally on architectures that have no atomic-dec/inc instructions.

    The mutex-null.h implementation forces all calls into the slowpath. This
    is used for mutex debugging, but it can also be used on platforms that do
    not want (or need) a fastpath at all.

    Signed-off-by: Ingo Molnar
    Signed-off-by: Arjan van de Ven

    Ingo Molnar