arm64: ssbd: Skip apply_ssbd if not using dynamic mitigation

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In order to avoid checking arm64_ssbd_callback_required on each
kernel entry/exit even if no mitigation is required, let's
add yet another alternative that by default jumps over the mitigation,
and that gets nop'ed out if we're doing dynamic mitigation.

Think of it as a poor man's static key...

Reviewed-by: Julien Grall <julien.grall@arm.com>
Reviewed-by: Mark Rutland <mark.rutland@arm.com>
Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

...

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Marc Zyngier 2018-05-29 13:11:11 +01:00 • committed by Catalin Marinas

parent c32e1736ca

commit 986372c436

2 changed files with 17 additions and 0 deletions

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14

arch/arm64/kernel/cpu_errata.c

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3

arch/arm64/kernel/entry.S

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