• Peter Zijlstra's avatar
    locking/lockdep, sched/core: Implement a better lock pinning scheme · e7904a28
    Peter Zijlstra authored
    The problem with the existing lock pinning is that each pin is of
    value 1; this mean you can simply unpin if you know its pinned,
    without having any extra information.
    This scheme generates a random (16 bit) cookie for each pin and
    requires this same cookie to unpin. This means you have to keep the
    cookie in context.
    No objsize difference for !LOCKDEP kernels.
    Signed-off-by: default avatarPeter Zijlstra (Intel) <peterz@infradead.org>
    Cc: Andrew Morton <akpm@linux-foundation.org>
    Cc: Linus Torvalds <torvalds@linux-foundation.org>
    Cc: Mike Galbraith <efault@gmx.de>
    Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
    Cc: Peter Zijlstra <peterz@infradead.org>
    Cc: Thomas Gleixner <tglx@linutronix.de>
    Cc: linux-kernel@vger.kernel.org
    Signed-off-by: default avatarIngo Molnar <mingo@kernel.org>
stop_task.c 2.93 KB