arm64/cpufeature: Convert hook_lock to raw_spin_lock_t in cpu_enable_ssbs()

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cpu_enable_ssbs() is called via stop_machine() as part of the cpu_enable
callback. A spin lock is used to ensure the hook is registered before
the rest of the callback is executed.

On -RT spin_lock() may sleep. However, all the callees in stop_machine()
are expected to not sleep. Therefore a raw_spin_lock() is required here.

Given this is already done under stop_machine() and the work done under
the lock is quite small, the latency should not increase too much.

Signed-off-by: Julien Grall <julien.grall@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

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Julien Grall 2019-05-30 12:30:58 +01:00 • committed by Catalin Marinas

parent 0c1f14ed12

commit 27e6e7d63f

1 changed files with 3 additions and 3 deletions

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arch/arm64/kernel/cpufeature.c

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