Eric Lee / smarc-fsl-linux-kernel

17 Jul, 2007

1 commit

  • 36cf3b5c3   FUTEX: Tidy up the code ... Browse Code »

    The recent PRIVATE and REQUEUE_PI changes to the futex code made it hard to
    read. Tidy it up.

    Signed-off-by: Thomas Gleixner
    Cc: Ingo Molnar
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Thomas Gleixner
     

19 Jun, 2007

1 commit

  • bd197234b   Revert "futex_requeue_pi optimization" ... Browse Code »

    This reverts commit d0aa7a70bf03b9de9e995ab272293be1f7937822.

    It not only introduced user space visible changes to the futex syscall,
    it is also non-functional and there is no way to fix it proper before
    the 2.6.22 release.

    The breakage report ( http://lkml.org/lkml/2007/5/12/17 ) went
    unanswered, and unfortunately it turned out that the concept is not
    feasible at all. It violates the rtmutex semantics badly by introducing
    a virtual owner, which hacks around the coupling of the user-space
    pi_futex and the kernel internal rt_mutex representation.

    At the moment the only safe option is to remove it fully as it contains
    user-space visible changes to broken kernel code, which we do not want
    to expose in the 2.6.22 release.

    The patch reverts the original patch mostly 1:1, but contains a couple
    of trivial manual cleanups which were necessary due to patches, which
    touched the same area of code later.

    Verified against the glibc tests and my own PI futex tests.

    Signed-off-by: Thomas Gleixner
    Acked-by: Ingo Molnar
    Acked-by: Ulrich Drepper
    Cc: Pierre Peiffer
    Signed-off-by: Linus Torvalds

    Thomas Gleixner
     

10 May, 2007

1 commit

  • d0aa7a70b   futex_requeue_pi optimization ... Browse Code »

    This patch provides the futex_requeue_pi functionality, which allows some
    threads waiting on a normal futex to be requeued on the wait-queue of a
    PI-futex.

    This provides an optimization, already used for (normal) futexes, to be used
    with the PI-futexes.

    This optimization is currently used by the glibc in pthread_broadcast, when
    using "normal" mutexes. With futex_requeue_pi, it can be used with
    PRIO_INHERIT mutexes too.

    Signed-off-by: Pierre Peiffer
    Cc: Ingo Molnar
    Cc: Ulrich Drepper
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Pierre Peiffer
     

28 Jun, 2006

3 commits

  • c87e2837b   [PATCH] pi-futex: futex_lock_pi/futex_unlock_pi support ... Browse Code »

    This adds the actual pi-futex implementation, based on rt-mutexes.

    [dino@in.ibm.com: fix an oops-causing race]
    Signed-off-by: Ingo Molnar
    Signed-off-by: Thomas Gleixner
    Signed-off-by: Arjan van de Ven
    Signed-off-by: Dinakar Guniguntala
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Ingo Molnar
     
  • 61a871228   [PATCH] pi-futex: rt mutex tester ... Browse Code »

    RT-mutex tester: scriptable tester for rt mutexes, which allows userspace
    scripting of mutex unit-tests (and dynamic tests as well), using the actual
    rt-mutex implementation of the kernel.

    [akpm@osdl.org: fixlet]
    Signed-off-by: Thomas Gleixner
    Signed-off-by: Ingo Molnar
    Signed-off-by: Arjan van de Ven
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Thomas Gleixner
     
  • 23f78d4a0   [PATCH] pi-futex: rt mutex core ... Browse Code »

    Core functions for the rt-mutex subsystem.

    Signed-off-by: Ingo Molnar
    Signed-off-by: Thomas Gleixner
    Signed-off-by: Arjan van de Ven
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Ingo Molnar