linux/include/asm-generic/atomic.h, branch v4.1

locking,arch: Use ACCESS_ONCE() instead of cast to volatile in atomic_read()

2014-10-03T04:06:23Z

Use the much more reader friendly ACCESS_ONCE() instead of the cast to volatile. This is purely a stylistic change. Signed-off-by: Pranith Kumar Acked-by: Jesper Nilsson Acked-by: Hans-Christian Egtvedt Acked-by: Max Filippov Signed-off-by: Peter Zijlstra (Intel) Cc: Linus Torvalds Cc: linux-arch@vger.kernel.org Link: http://lkml.kernel.org/r/1411482607-20948-1-git-send-email-bobby.prani@gmail.com Signed-off-by: Ingo Molnar

locking,arch: Rewrite generic atomic support

2014-08-14T10:48:14Z

Rewrite generic atomic support to only require cmpxchg(), generate all other primitives from that. Furthermore reduce the endless repetition for all these primitives to a few CPP macros. This way we get more for less lines. Signed-off-by: Peter Zijlstra Link: http://lkml.kernel.org/r/20140508135852.940119622@infradead.org Cc: Arnd Bergmann Cc: David Howells Cc: Paul E. McKenney Cc: David S. Miller Cc: Linus Torvalds Cc: linux-arch@vger.kernel.org Signed-off-by: Ingo Molnar

arch: Prepare for smp_mb__{before,after}_atomic()

2014-04-18T09:40:30Z

Since the smp_mb__{before,after}*() ops are fundamentally dependent on how an arch can implement atomics it doesn't make sense to have 3 variants of them. They must all be the same. Furthermore, the 3 variants suggest they're only valid for those 3 atomic ops, while we have many more where they could be applied. So move away from smp_mb__{before,after}_{atomic,clear}_{dec,inc,bit}() and reduce the interface to just the two: smp_mb__{before,after}_atomic(). This patch prepares the way by introducing default implementations in asm-generic/barrier.h that default to a full barrier and providing __deprecated inlines for the previous 6 barriers if they're not provided by the arch. This should allow for a mostly painless transition (lots of deprecated warns in the interim). Signed-off-by: Peter Zijlstra Acked-by: Paul E. McKenney Link: http://lkml.kernel.org/n/tip-wr59327qdyi9mbzn6x937s4e@git.kernel.org Cc: Arnd Bergmann Cc: "Chen, Gong" Cc: John Sullivan Cc: Linus Torvalds Cc: Mauro Carvalho Chehab Cc: Srinivas Pandruvada Cc: "Theodore Ts'o" Cc: linux-arch@vger.kernel.org Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar

asm-generic: move cmpxchg*_local defs to cmpxchg.h

2013-03-13T05:11:05Z

asm/cmpxchg.h can be included on its own and needs to be self-consistent. The definitions for the cmpxchg*_local macros, as such, need to be part of this file. This fixes a build issue on OpenRISC since the system.h smashing patch 96f951edb1f1bdbbc99b0cd458f9808bb83d58ae that introdued the direct inclusion asm/cmpxchg.h into linux/llist.h. CC: David Howells Signed-off-by: Jonas Bonn Acked-by: Arnd Bergmann

Remove all #inclusions of asm/system.h

2012-03-28T17:30:03Z

Remove all #inclusions of asm/system.h preparatory to splitting and killing it. Performed with the following command: perl -p -i -e 's!^#\s*include\s*.*\n!!' `grep -Irl '^#\s*include\s*' *` Signed-off-by: David Howells

Make asm-generic/cmpxchg.h #include asm-generic/cmpxchg-local.h

2012-03-28T17:30:03Z

Make asm-generic/cmpxchg.h #include asm-generic/cmpxchg-local.h as all arch files that #include the former also #include the latter. See: grep -rl asm-generic/cmpxchg-local[.]h arch/ | sort > b grep -rl asm-generic/cmpxchg[.]h arch/ | sort > a comm a b This simplifies the disintegration of asm-generic/system.h for arches that don't have their own. Signed-off-by: David Howells Acked-by: Arnd Bergmann

asm-generic/atomic.h: allow SMP peeps to leverage this

2011-07-26T23:49:48Z

Only a few core funcs need to be implemented for SMP systems, so allow the arches to override them while getting the rest for free. At least, this is enough to allow the Blackfin SMP port to use things. Signed-off-by: Mike Frysinger Cc: Arun Sharma Cc: Arnd Bergmann Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

asm-generic/atomic.h: add atomic_set_mask() helper

2011-07-26T23:49:48Z

Since arches are expected to implement this guy, add a common version for people the same way as atomic_clear_mask is handled. Signed-off-by: Mike Frysinger Cc: Arun Sharma Cc: Arnd Bergmann Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

asm-generic/atomic.h: fix type used in atomic_clear_mask

2011-07-26T23:49:47Z

The atomic helpers are supposed to take an atomic_t pointer, not a random unsigned long pointer. So convert atomic_clear_mask over. While we're here, also add some nice documentation to the func. Signed-off-by: Mike Frysinger Cc: Arun Sharma Cc: Arnd Bergmann Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

asm-generic/atomic.h: simplify inc/dec test helpers

2011-07-26T23:49:47Z

We already declared inc/dec helpers, so we don't need to call the atomic_{add,sub}_return funcs directly. Signed-off-by: Mike Frysinger Cc: Arun Sharma Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds