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Pan Xinhui authored
The existing version uses a heavy barrier while only release semantics is required. So use atomic_sub_return_release() instead. Suggested-by:
Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by:
Pan Xinhui <xinhui.pan@linux.vnet.ibm.com> Signed-off-by:
Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: arnd@arndb.de Cc: waiman.long@hp.com Link: http://lkml.kernel.org/r/1464943094-3129-1-git-send-email-xinhui.pan@linux.vnet.ibm.comSigned-off-by:
Ingo Molnar <mingo@kernel.org>
ca50e426