Eric Lee / smarc-fsl-linux-kernel

26 Jul, 2007

1 commit

  • e107be36e   [PATCH] sched: arch preempt notifier mechanism ... Browse Code »

    This adds a general mechanism whereby a task can request the scheduler to
    notify it whenever it is preempted or scheduled back in. This allows the
    task to swap any special-purpose registers like the fpu or Intel's VT
    registers.

    Signed-off-by: Avi Kivity
    [ mingo@elte.hu: fixes, cleanups ]
    Signed-off-by: Ingo Molnar

    Avi Kivity
     

26 Apr, 2006

1 commit

23 Dec, 2005

1 commit

  • d6f029130   [PATCH] fix race with preempt_enable() ... Browse Code »

    Currently a simple

    void foo(void) { preempt_enable(); }

    produces the following code on ARM:

    foo:
    bic r3, sp, #8128
    bic r3, r3, #63
    ldr r2, [r3, #4]
    ldr r1, [r3, #0]
    sub r2, r2, #1
    tst r1, #4
    str r2, [r3, #4]
    blne preempt_schedule
    mov pc, lr

    The problem is that the TIF_NEED_RESCHED flag is loaded _before_ the
    preemption count is stored back, hence any interrupt coming within that
    3 instruction window causing TIF_NEED_RESCHED to be set won't be
    seen and scheduling won't happen as it should.

    Nothing currently prevents gcc from performing that reordering. There
    is already a barrier() before the decrement of the preemption count, but
    another one is needed between this and the TIF_NEED_RESCHED flag test
    for proper code ordering.

    Signed-off-by: Nicolas Pitre
    Acked-by: Nick Piggin
    Signed-off-by: Linus Torvalds

    Nicolas Pitre
     

14 Nov, 2005

1 commit

  • f037360f2   [PATCH] m68k: thread_info header cleanup ... Browse Code »

    a) in smp_lock.h #include of sched.h and spinlock.h moved under #ifdef
    CONFIG_LOCK_KERNEL.

    b) interrupt.h now explicitly pulls sched.h (not via smp_lock.h from
    hardirq.h as it used to)

    c) in three more places we need changes to compensate for (a) - one place
    in arch/sparc needs string.h now, hardirq.h needs forward declaration of
    task_struct and preempt.h needs direct include of thread_info.h.

    d) thread_info-related helpers in sched.h and thread_info.h put under
    ifndef __HAVE_THREAD_FUNCTIONS. Obviously safe.

    Signed-off-by: Al Viro
    Signed-off-by: Roman Zippel
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Al Viro
     

17 Apr, 2005

1 commit

  • 1da177e4c   Linux-2.6.12-rc2 ... Browse Code »

    Initial git repository build. I'm not bothering with the full history,
    even though we have it. We can create a separate "historical" git
    archive of that later if we want to, and in the meantime it's about
    3.2GB when imported into git - space that would just make the early
    git days unnecessarily complicated, when we don't have a lot of good
    infrastructure for it.

    Let it rip!

    Linus Torvalds