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| author |   Dave Martin <Dave.Martin@arm.com> | 2017-08-09 11:43:28 +0100 |
|---|---|---|
| committer |   Catalin Marinas <catalin.marinas@arm.com> | 2017-08-09 15:05:59 +0100 |
| commit | 66c3ec5a712005625437474cf5a04148d7890350 (patch) | |
| tree | 38274244ae2d7531ce45045cbfb2b64201dd69fb /arch/arm64/kernel/fpsimd.c | |
| parent | arm64: neon: Export kernel_neon_busy to loadable modules (diff) | |
| download | linux-dev-66c3ec5a712005625437474cf5a04148d7890350.tar.xz linux-dev-66c3ec5a712005625437474cf5a04148d7890350.zip | |
arm64: neon: Forbid when irqs are disabled
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>
Diffstat (limited to '')
0 files changed, 0 insertions, 0 deletions