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authorRussell King <rmk@dyn-67.arm.linux.org.uk>2005-12-01 10:47:24 -0500
committerRussell King <rmk+kernel@arm.linux.org.uk>2005-12-01 10:47:24 -0500
commit00b4c90787298349b799069360ced9ca843153dc (patch)
treecb135bdb9a408ec771c862caae5d86a2d6754861 /arch/arm/mach-aaec2000
parentdf2f5e721ed36e21da27e1f415c71ba0e20f31b5 (diff)
[ARM SMP] Use event instructions for spinlocks
ARMv6K CPUs have SEV (send event) and WFE (wait for event) instructions which allow the CPU clock to be suspended until another CPU issues a SEV, rather than spinning on the lock wasting power. Make use of these instructions. Note that WFE does not wait if an event has been sent since the last WFE cleared the event status, so although it may look racy, the instruction implementation ensures that these are dealt with. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/mach-aaec2000')
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