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author | 2016-04-18 01:16:04 +0200 | |
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committer | 2016-06-16 10:48:29 +0200 | |
commit | 7d9794e7523798e1b9422ad9f4e4d808ae5d5932 (patch) | |
tree | 3a1a550803485049b8e8c2a434c0c9107831f3a6 /arch/sparc/lib | |
parent | locking/atomic, arch/s390: Implement atomic{,64}_fetch_{add,sub,and,or,xor}() (diff) | |
download | linux-7d9794e7523798e1b9422ad9f4e4d808ae5d5932.tar.gz linux-7d9794e7523798e1b9422ad9f4e4d808ae5d5932.tar.bz2 linux-7d9794e7523798e1b9422ad9f4e4d808ae5d5932.zip |
locking/atomic, arch/sh: Implement atomic_fetch_{add,sub,and,or,xor}()
Implement FETCH-OP atomic primitives, these are very similar to the
existing OP-RETURN primitives we already have, except they return the
value of the atomic variable _before_ modification.
This is especially useful for irreversible operations -- such as
bitops (because it becomes impossible to reconstruct the state prior
to modification).
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rich Felker <dalias@libc.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
Cc: linux-arch@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Cc: linux-sh@vger.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/sparc/lib')
0 files changed, 0 insertions, 0 deletions