• Paul E. McKenney's avatar
    ipc: Replace spin_unlock_wait() with lock/unlock pair · e0892e08
    Paul E. McKenney authored
    There is no agreed-upon definition of spin_unlock_wait()'s semantics,
    and it appears that all callers could do just as well with a lock/unlock
    pair.  This commit therefore replaces the spin_unlock_wait() call in
    exit_sem() with spin_lock() followed immediately by spin_unlock().
    This should be safe from a performance perspective because exit_sem()
    is rarely invoked in production.
    Signed-off-by: default avatarPaul E. McKenney <paulmck@linux.vnet.ibm.com>
    Cc: Andrew Morton <akpm@linux-foundation.org>
    Cc: Davidlohr Bueso <dave@stgolabs.net>
    Cc: Will Deacon <will.deacon@arm.com>
    Cc: Peter Zijlstra <peterz@infradead.org>
    Cc: Alan Stern <stern@rowland.harvard.edu>
    Cc: Andrea Parri <parri.andrea@gmail.com>
    Cc: Linus Torvalds <torvalds@linux-foundation.org>
    Acked-by: default avatarManfred Spraul <manfred@colorfullife.com>
    e0892e08
sem.c 55.1 KB