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* arch: Make __mutex_fastpath_lock_retval return whether fastpath succeeded or notMaarten Lankhorst2013-06-261-2/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This will allow me to call functions that have multiple arguments if fastpath fails. This is required to support ticket mutexes, because they need to be able to pass an extra argument to the fail function. Originally I duplicated the functions, by adding __mutex_fastpath_lock_retval_arg. This ended up being just a duplication of the existing function, so a way to test if fastpath was called ended up being better. This also cleaned up the reservation mutex patch some by being able to call an atomic_set instead of atomic_xchg, and making it easier to detect if the wrong unlock function was previously used. Signed-off-by: Maarten Lankhorst <maarten.lankhorst@canonical.com> Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: dri-devel@lists.freedesktop.org Cc: linaro-mm-sig@lists.linaro.org Cc: robclark@gmail.com Cc: rostedt@goodmis.org Cc: daniel@ffwll.ch Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/20130620113105.4001.83929.stgit@patser Signed-off-by: Ingo Molnar <mingo@kernel.org>
* sh: Fix up T-bit error handling in SH-4A mutex fastpath.Takashi Yoshii2009-01-291-12/+9
| | | | | | | | | This corrects a deadlock encountered on ap325 in the cases where the mutex is contended and the slow-path needs to be fallen back upon. Signed-off-by: Takashi YOSHII <yoshii.takashi@renesas.com> Signed-off-by: Kuninori Morimoto <morimoto.kuninori@renesas.com> Signed-off-by: Paul Mundt <lethal@linux-sh.org>
* sh: Fix an off-by-1 check in __mutex_fastpath_unlock().Paul Mundt2008-12-221-1/+1
| | | | Signed-off-by: Paul Mundt <lethal@linux-sh.org>
* sh: Fix up the SH-4A mutex fastpath semantics.Paul Mundt2008-12-221-16/+21
| | | | | | | | | This fixes up the __mutex_fastpath_xxx() routines to match the semantics noted in the comment. Previously these were looping rather than doing a single-pass, which is counter-intuitive, as the slow path takes care of the looping for us in the event of contention. Signed-off-by: Paul Mundt <lethal@linux-sh.org>
* sh: Add SH-4A optimized fastpath mutex implementation.Michael Trimarchi2008-12-221-0/+107
Add fast mutex path implementation for the SH4A architecture Signed-off-by: Michael Trimarchi <trimarchimichael@yahoo.it> Signed-off-by: Paul Mundt <lethal@linux-sh.org>
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