BMC/Intel-BMC/linux.git/arch/ia64/include/asm/atomic.h, branch dev

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

2014-10-03T04:06:23+00:00

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,ia64: Fold atomic_ops

2014-08-14T10:48:07+00:00

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. Signed-off-by: Peter Zijlstra Cc: Fenghua Yu Cc: Linus Torvalds Cc: Akinobu Mita Cc: Paul E. McKenney Cc: Tony Luck Cc: linux-ia64@vger.kernel.org Link: http://lkml.kernel.org/r/20140508135852.245224472@infradead.org Signed-off-by: Ingo Molnar

arch,ia64: Convert smp_mb__*()

2014-04-18T12:20:35+00:00

ia64 atomic ops are full barriers; implement the new smp_mb__{before,after}_atomic(). Signed-off-by: Peter Zijlstra Acked-by: Paul E. McKenney Link: http://lkml.kernel.org/n/tip-hyp7yj68cmqz1nqbfpr541ca@git.kernel.org Cc: Akinobu Mita Cc: Fenghua Yu Cc: Linus Torvalds Cc: Tony Luck Cc: Will Deacon Cc: linux-ia64@vger.kernel.org Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar

[IA64] Redefine ATOMIC_INIT and ATOMIC64_INIT to drop the casts

2012-07-26T17:55:26+00:00

The following build error occured during a ia64 build with swap-over-NFS patches applied. net/core/sock.c:274:36: error: initializer element is not constant net/core/sock.c:274:36: error: (near initialization for 'memalloc_socks') net/core/sock.c:274:36: error: initializer element is not constant This is identical to a parisc build error. Fengguang Wu, Mel Gorman and James Bottomley did all the legwork to track the root cause of the problem. This fix and entire commit log is shamelessly copied from them with one extra detail to change a dubious runtime use of ATOMIC_INIT() to atomic_set() in drivers/char/mspec.c 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: Tony Luck

Disintegrate asm/system.h for IA64

2012-03-28T17:30:02+00:00

Disintegrate asm/system.h for IA64. Signed-off-by: David Howells Acked-by: Tony Luck cc: linux-ia64@vger.kernel.org

atomic: cleanup asm-generic atomic*.h inclusion

2011-07-26T23:49:47+00:00

After changing all consumers of atomics to include , we ran into some compile time errors due to this dependency chain: linux/atomic.h -> asm/atomic.h -> asm-generic/atomic-long.h where atomic-long.h could use funcs defined later in linux/atomic.h without a prototype. This patches moves the code that includes asm-generic/atomic*.h to linux/atomic.h. Archs that need need to select CONFIG_GENERIC_ATOMIC64 from now on (some of them used to include it unconditionally). Compile tested on i386 and x86_64 with allnoconfig. Signed-off-by: Arun Sharma Cc: Eric Dumazet Cc: Ingo Molnar Cc: David Miller Acked-by: Mike Frysinger Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

atomic: move atomic_add_unless to generic code

2011-07-26T23:49:47+00:00

This is in preparation for more generic atomic primitives based on __atomic_add_unless. Signed-off-by: Arun Sharma Signed-off-by: Hans-Christian Egtvedt Reviewed-by: Eric Dumazet Cc: Ingo Molnar Cc: David Miller Acked-by: Mike Frysinger Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

atomic: use

2011-07-26T23:49:47+00:00

This allows us to move duplicated code in (atomic_inc_not_zero() for now) to Signed-off-by: Arun Sharma Reviewed-by: Eric Dumazet Cc: Ingo Molnar Cc: David Miller Cc: Eric Dumazet Acked-by: Mike Frysinger Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

[IA64] Fix 64-bit atomic routines to return "long"

2010-08-13T23:41:07+00:00

These have been broken (returning "int") since the dawn of time. But there were no users that needed the whole value until commit 424acaaeb3a3932d64a9b4bd59df6cf72c22d8f3 rwsem: wake queued readers when writer blocks on active read lock made this change: - (rwsem_atomic_update(0, sem) & RWSEM_ACTIVE_MASK)) - /* Someone grabbed the sem already */ + rwsem_atomic_update(0, sem) < RWSEM_WAITING_BIAS) + /* Someone grabbed the sem for write already */ RWSEM_ACTIVE_MASK is 0xffffffffL, so the old code only looked at the low order 32-bits. The new code needs to see all 64 bits. Signed-off-by: Tony Luck

atomic_t: Cast to volatile when accessing atomic variables

2010-05-17T14:57:27+00:00

In preparation for removing volatile from the atomic_t definition, this patch adds a volatile cast to all the atomic read functions. Signed-off-by: Anton Blanchard Signed-off-by: Linus Torvalds