arm64: fpsimd: Bring cond_yield asm macro in line with new rules

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We no longer disable softirqs or preemption when doing kernel mode SIMD,
and so for fully preemptible kernels, there is no longer a need to do any
explicit yielding (and for non-preemptible kernels, yielding is not
needed either).

That leaves voluntary preemption, where only explicit yield calls may
result in a reschedule. To retain the existing behavior for such a
configuration, we should take the new situation into account, where the
preempt count will be zero rather than one, and yielding to pending
softirqs is unnecessary.

Fixes: aefbab8e77 ("arm64: fpsimd: Preserve/restore kernel mode NEON at context switch")
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Reviewed-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20240111112447.577640-2-ardb+git@google.com
Signed-off-by: Will Deacon <will@kernel.org>

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Ard Biesheuvel 2024-01-11 12:24:48 +01:00 • committed by Will Deacon

parent 8c5a19cb17

commit 3931261ecf

2 changed files with 9 additions and 18 deletions

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25

arch/arm64/include/asm/assembler.h

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2

arch/arm64/kernel/asm-offsets.c

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