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| author | Will Deacon <will@kernel.org> | 2021-03-18 17:07:37 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-08-12 13:21:04 +0200 |
| commit | 07fd256d53a3eaaaebc2da258fe2c69c9628c371 (patch) | |
| tree | d2f266d29e1bbf4f18590975605d843191cfd636 /sound | |
| parent | 90e498ef3f5462c806216690a3af53213ae428ed (diff) | |
| download | linux-stable-07fd256d53a3eaaaebc2da258fe2c69c9628c371.tar.gz linux-stable-07fd256d53a3eaaaebc2da258fe2c69c9628c371.tar.bz2 linux-stable-07fd256d53a3eaaaebc2da258fe2c69c9628c371.zip | |
arm64: vdso: Avoid ISB after reading from cntvct_el0
commit 77ec462536a13d4b428a1eead725c4818a49f0b1 upstream.
We can avoid the expensive ISB instruction after reading the counter in
the vDSO gettime functions by creating a fake address hazard against a
dummy stack read, just like we do inside the kernel.
Signed-off-by: Will Deacon <will@kernel.org>
Reviewed-by: Vincenzo Frascino <vincenzo.frascino@arm.com>
Link: https://lore.kernel.org/r/20210318170738.7756-5-will@kernel.org
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Chanho Park <chanho61.park@samsung.com>
Diffstat (limited to 'sound')
0 files changed, 0 insertions, 0 deletions