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(parent: 7ba8e71) | patch
ARCv2: spinlock/rwlock/atomics: reduce 1 instruction in exponential backoff
authorVineet Gupta <vgupta@synopsys.com>
Fri, 7 Aug 2015 07:31:39 +0000 (13:01 +0530)
committerVineet Gupta <vgupta@synopsys.com>
Fri, 7 Aug 2015 08:26:16 +0000 (13:56 +0530)
commitea2eb4d508a9809d84825eaf261957262d7f3254
treeb210f8710277b0ae74ea5c8143c3c9f6b5dc5bd1tree | snapshot
parent7ba8e7114235a5d7f5b417c20073c1ad7337685fcommit | diff
ARCv2: spinlock/rwlock/atomics: reduce 1 instruction in exponential backoff

The increment of delay counter was 2 instructions:
Arithmatic Shfit Left (ASL) + set to 1 on overflow

This can be done in 1 using ROtate Left (ROL)

Suggested-by: Nigel Topham <ntopham@synopsys.com>
Cc: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
arch/arc/include/asm/atomic.h diff | blob | history
arch/arc/include/asm/spinlock.h diff | blob | history
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