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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: 5284e1b ("arm64: xchg: Implement cmpxchg_double") Fixes: f97fc81 ("arm64: percpu: Implement this_cpu operations") Reported-by: Mark Rutland <[email protected]> Acked-by: Will Deacon <[email protected]> Signed-off-by: Steve Capper <[email protected]> [[email protected]: remove space after type cast] Signed-off-by: Catalin Marinas <[email protected]>
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