Eric Lee / smarc-fsl-linux-kernel

07 Oct, 2015

5 commits

  • cc5f730b4   locking/percpu-rwsem: Clean up the lockdep annotations in percpu_down_read() ... Browse Code »

    Based on Peter Zijlstra's earlier patch.

    Change percpu_down_read() to use __down_read(), this way we can
    do rwsem_acquire_read() unconditionally at the start to make this
    code more symmetric and clean.

    Originally-From: Peter Zijlstra
    Signed-off-by: Oleg Nesterov
    Signed-off-by: Paul E. McKenney
    Reviewed-by: Josh Triplett

    Oleg Nesterov
     
  • f324a7632   locking/percpu-rwsem: Fix the comments outdated by rcu_sync ... Browse Code »

    Update the comments broken by the previous change.

    Signed-off-by: Oleg Nesterov
    Signed-off-by: Paul E. McKenney
    Reviewed-by: Josh Triplett

    Oleg Nesterov
     
  • 001dac627   locking/percpu-rwsem: Make use of the rcu_sync infrastructure ... Browse Code »

    Currently down_write/up_write calls synchronize_sched_expedited()
    twice, which is evil. Change this code to rely on rcu-sync primitives.
    This avoids the _expedited "big hammer", and this can be faster in
    the contended case or even in the case when a single thread does
    down_write/up_write in a loop.

    Of course, a single down_write() will take more time, but otoh it
    will be much more friendly to the whole system.

    To simplify the review this patch doesn't update the comments, fixed
    by the next change.

    Signed-off-by: Oleg Nesterov
    Signed-off-by: Paul E. McKenney
    Reviewed-by: Josh Triplett

    Oleg Nesterov
     
  • 95b19f684   locking/percpu-rwsem: Make percpu_free_rwsem() after kzalloc() safe ... Browse Code »

    This is the temporary ugly hack which will be reverted later. We only
    need it to ensure that the next patch will not break "change sb_writers
    to use percpu_rw_semaphore" patches routed via the VFS tree.

    The alloc_super()->destroy_super() error path assumes that it is safe
    to call percpu_free_rwsem() after kzalloc() without percpu_init_rwsem(),
    so let's not disappoint it.

    Signed-off-by: Oleg Nesterov
    Signed-off-by: Paul E. McKenney
    Reviewed-by: Josh Triplett

    Oleg Nesterov
     
  • 302707fd7   locking/percpu-rwsem: Export symbols for locktorture ... Browse Code »

    This commit exports percpu_down_read(), percpu_down_write(),
    __percpu_init_rwsem(), percpu_up_read(), and percpu_up_write() to allow
    locktorture to test them when built as a module.

    Signed-off-by: Paul E. McKenney
    Reviewed-by: Josh Triplett

    Paul E. McKenney
     

15 Aug, 2015

1 commit

06 Nov, 2013

1 commit