• Davidlohr Bueso's avatar
    locking/atomic: Introduce inc/dec variants for the atomic_fetch_$op() API · f0662863
    Davidlohr Bueso authored
    With the inclusion of atomic FETCH-OP variants, many places in the
    kernel can make use of atomic_fetch_$op() to avoid the callers that
    need to compute the value/state _before_ the operation.
    
    Peter Zijlstra laid out the machinery but we are still missing the
    simpler dec,inc() calls (which future patches will make use of).
    
    This patch only deals with the generic code, as at least right now
    no arch actually implement them -- which is similar to what the
    OP-RETURN primitives currently do.
    Signed-off-by: 's avatarDavidlohr Bueso <dbueso@suse.de>
    Signed-off-by: 's avatarPeter Zijlstra (Intel) <peterz@infradead.org>
    Cc: Andrew Morton <akpm@linux-foundation.org>
    Cc: James.Bottomley@HansenPartnership.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: awalls@md.metrocast.net
    Cc: bp@alien8.de
    Cc: cw00.choi@samsung.com
    Cc: davem@davemloft.net
    Cc: dledford@redhat.com
    Cc: dougthompson@xmission.com
    Cc: gregkh@linuxfoundation.org
    Cc: hans.verkuil@cisco.com
    Cc: heiko.carstens@de.ibm.com
    Cc: jikos@kernel.org
    Cc: kys@microsoft.com
    Cc: mchehab@osg.samsung.com
    Cc: pfg@sgi.com
    Cc: schwidefsky@de.ibm.com
    Cc: sean.hefty@intel.com
    Cc: sumit.semwal@linaro.org
    Link: http://lkml.kernel.org/r/20160628215651.GA20048@linux-80c1.suseSigned-off-by: 's avatarIngo Molnar <mingo@kernel.org>
    f0662863
atomic.h 28.3 KB