linux/arch/alpha/include/asm/atomic.h, branch v4.5

atomic, arch: Audit atomic_{read,set}()

2015-09-23T07:54:28Z

This patch makes sure that atomic_{read,set}() are at least {READ,WRITE}_ONCE(). 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: Peter Zijlstra (Intel) Cc: Andrew Morton Cc: Dmitry Vyukov Cc: Linus Torvalds Cc: Paul E. McKenney Cc: Peter Zijlstra Cc: Thomas Gleixner Cc: james.hogan@imgtec.com Cc: linux-kernel@vger.kernel.org Cc: oleg@redhat.com Cc: will.deacon@arm.com Signed-off-by: Ingo Molnar

atomic: Provide atomic_{or,xor,and}

2015-07-27T12:06:24Z

Implement atomic logic ops -- atomic_{or,xor,and}. These will replace the atomic_{set,clear}_mask functions that are available on some archs. Signed-off-by: Peter Zijlstra (Intel) Signed-off-by: Thomas Gleixner

alpha: Provide atomic_{or,xor,and}

2015-07-27T12:06:21Z

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,alpha: Fold atomic_ops

2014-08-14T10:48:03Z

Many of the atomic op implementations are the same except for one instruction; fold the lot into a few CPP macros and reduce LoC. This also prepares for easy addition of new ops. Cc: Matt Turner Cc: Richard Henderson Cc: Ivan Kokshaysky Cc: Linus Torvalds Signed-off-by: Peter Zijlstra Cc: Ivan Kokshaysky Cc: Linus Torvalds Cc: Matt Turner Cc: Paul E. McKenney Cc: Richard Henderson Cc: linux-alpha@vger.kernel.org Link: http://lkml.kernel.org/r/20140508135851.832107183@infradead.org Signed-off-by: Ingo Molnar

arch,alpha: Convert smp_mb__*() to the asm-generic primitives

2014-04-18T09:40:31Z

The Alpha ll/sc primitives do not imply any sort of barrier; therefore the smp_mb__{before,after} should be a full barrier. This is the default from asm-generic/barrier.h and therefore just remove the current definitions. Signed-off-by: Peter Zijlstra Acked-by: Paul E. McKenney Link: http://lkml.kernel.org/n/tip-iacwfd15lq3ta2v7jut747r7@git.kernel.org Cc: Ivan Kokshaysky Cc: Linus Torvalds Cc: Matt Turner Cc: Richard Henderson Cc: linux-alpha@vger.kernel.org Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar

alpha: Implement atomic64_dec_if_positive

2013-07-19T20:54:24Z

Reviewed-and-Tested-by: Matt Turner Signed-off-by: Matt Turner Signed-off-by: Richard Henderson

alpha: Improve atomic_add_unless

2013-07-19T20:54:24Z

Use ll/sc loops instead of C loops around cmpxchg. Update the atomic64_add_unless block comment to match the code. Reviewed-and-Tested-by: Matt Turner Signed-off-by: Matt Turner Signed-off-by: Richard Henderson

Redefine ATOMIC_INIT and ATOMIC64_INIT to drop the casts

2012-08-19T15:41:19Z

The following build error occurred during an alpha build: net/core/sock.c:274:36: error: initializer element is not constant Dave Anglin says: > Here is the line in sock.i: > > struct static_key memalloc_socks = ((struct static_key) { .enabled = > ((atomic_t) { (0) }) }); The above line contains two compound literals. It also uses a designated initializer to initialize the field enabled. A compound literal is not a constant expression. The location of the above statement isn't fully clear, but if a compound literal occurs outside the body of a function, the initializer list must consist of constant expressions. Cc: Signed-off-by: Mel Gorman Signed-off-by: Fengguang Wu Signed-off-by: Michael Cree Acked-by: Matt Turner Signed-off-by: Linus Torvalds

alpha: fix build failures from system.h dismemberment

2012-04-13T17:15:16Z

commit ec2212088c42ff7d1362629ec26dda4f3e8bdad3 "Disintegrate asm/system.h for Alpha" combined with commit b4816afa3986704d1404fc48e931da5135820472 "Move the asm-generic/system.h xchg() implementation to asm-generic/cmpxchg.h" introduced the concept of asm/cmpxchg.h but the alpha arch never got one. Fork the cmpxchg content out of the asm/atomic.h file to create one. Some minor whitespace fixups were done on the block of code that created the new file. Cc: Richard Henderson Cc: Ivan Kokshaysky Cc: Matt Turner Cc: David Howells Acked-by: Matt Turner Signed-off-by: Paul Gortmaker