• Peter Zijlstra's avatar
    atomic, arch: Audit atomic_{read,set}() · 62e8a325
    Peter Zijlstra authored
    This patch makes sure that atomic_{read,set}() are at least
    We already had the 'requirement' that atomic_read() should use
    ACCESS_ONCE(), and most archs had this, but a few were lacking.
    All are now converted to use READ_ONCE().
    And, by a symmetry and general paranoia argument, upgrade atomic_set()
    to use WRITE_ONCE().
    Signed-off-by: default avatarPeter Zijlstra (Intel) <peterz@infradead.org>
    Cc: Andrew Morton <akpm@linux-foundation.org>
    Cc: Dmitry Vyukov <dvyukov@google.com>
    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: james.hogan@imgtec.com
    Cc: linux-kernel@vger.kernel.org
    Cc: oleg@redhat.com
    Cc: will.deacon@arm.com
    Signed-off-by: default avatarIngo Molnar <mingo@kernel.org>
atomic.h 4.18 KB