Steve Capper f3eab7184d arm64: percpu: Make this_cpu accessors pre-empt safe ... this_cpu operations were implemented for arm64 in: 5284e1b arm64: xchg: Implement cmpxchg_double f97fc81 arm64: percpu: Implement this_cpu operations Unfortunately, it is possible for pre-emption to take place between address generation and data access. This can lead to cases where data is being manipulated by this_cpu for a different CPU than it was called on. Which effectively breaks the spec. This patch disables pre-emption for the this_cpu operations guaranteeing that address generation and data manipulation take place without a pre-emption in-between. Fixes: 5284e1b4bc ("arm64: xchg: Implement cmpxchg_double") Fixes: f97fc81079 ("arm64: percpu: Implement this_cpu operations") Reported-by: Mark Rutland <mark.rutland@arm.com> Acked-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Steve Capper <steve.capper@linaro.org> [catalin.marinas@arm.com: remove space after type cast] Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>		2015-03-24 18:02:55 +00:00
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asm	arm64: percpu: Make this_cpu accessors pre-empt safe	2015-03-24 18:02:55 +00:00
uapi/asm	Fairly small update, but there are some interesting new features.	2015-02-13 09:55:09 -08:00