arm64: neon: Forbid when irqs are disabled

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Currently, may_use_simd() can return true if IRQs are disabled.  If
the caller goes ahead and calls kernel_neon_begin(), this can
result in use of local_bh_enable() in an unsafe context.

In particular, __efi_fpsimd_begin() may do this when calling EFI as
part of system shutdown.

This patch ensures that callers don't think they can use
kernel_neon_begin() in such a context.

Acked-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Dave Martin <Dave.Martin@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

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Dave Martin 2017-08-09 11:43:28 +01:00 • committed by Catalin Marinas

parent 11cefd5ac2

commit 66c3ec5a71

1 changed files with 3 additions and 1 deletions

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arch/arm64/include/asm/simd.h

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