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| author | Andy Lutomirski <luto@kernel.org> | 2021-01-21 08:09:51 +0300 |
|---|---|---|
| committer | Borislav Petkov <bp@suse.de> | 2021-01-29 14:27:47 +0300 |
| commit | 49200d17d27d5cc1aede2d1bb2a78dbfc1563e65 (patch) | |
| tree | 8f126191de040ce89b2800b4e4204fad8d666a64 /arch/x86/include/asm/string_64.h | |
| parent | b0dc553cfc9d3bc2c7b8672b0b2fcf0edf0c3b6e (diff) | |
| download | linux-49200d17d27d5cc1aede2d1bb2a78dbfc1563e65.tar.xz | |
x86/fpu/64: Don't FNINIT in kernel_fpu_begin()
The remaining callers of kernel_fpu_begin() in 64-bit kernels don't use 387
instructions, so there's no need to sanitize the FPU state. Skip it to get
most of the performance we lost back.
Reported-by: Krzysztof Olędzki <ole@ans.pl>
Signed-off-by: Andy Lutomirski <luto@kernel.org>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lkml.kernel.org/r/57f8841ccbf9f3c25a23196c888f5f6ec5887577.1611205691.git.luto@kernel.org
Diffstat (limited to 'arch/x86/include/asm/string_64.h')
0 files changed, 0 insertions, 0 deletions