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| author | Will Deacon <will.deacon@arm.com> | 2015-08-06 16:54:42 (GMT) |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2015-08-12 09:59:06 (GMT) |
| commit | 77e430e3e45662b696dc49aa53ea0f7ac63f2574 (patch) | |
| tree | 1fae9dab1524de8b3ca2516228ff76b809626974 /security | |
| parent | 2b2a85a4d3534b8884fcfa5bb52837f0e1c672bc (diff) | |
| download | linux-77e430e3e45662b696dc49aa53ea0f7ac63f2574.tar.xz | |
locking/qrwlock: Make use of _{acquire|release|relaxed}() atomics
The qrwlock implementation is slightly heavy in its use of memory
barriers, mainly through the use of _cmpxchg() and _return() atomics, which
imply full barrier semantics.
This patch modifies the qrwlock code to use the more relaxed atomic
routines so that we can reduce the unnecessary barrier overhead on
weakly-ordered architectures.
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Waiman.Long@hp.com
Cc: paulmck@linux.vnet.ibm.com
Link: http://lkml.kernel.org/r/1438880084-18856-7-git-send-email-will.deacon@arm.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'security')
0 files changed, 0 insertions, 0 deletions