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| author | Marc Zyngier <maz@kernel.org> | 2023-11-22 13:37:54 +0000 |
|---|---|---|
| committer | Will Deacon <will@kernel.org> | 2023-12-05 12:02:52 +0000 |
| commit | 103423ad7e56d6c756738823c332c414b07899e6 (patch) | |
| tree | b9d035477eccd3c6769cd3597c12d15b139af195 /arch/arm64/tools | |
| parent | 2cc14f52aeb78ce3f29677c2de1f06c0e91471ab (diff) | |
| download | linux-103423ad7e56d6c756738823c332c414b07899e6.tar.gz linux-103423ad7e56d6c756738823c332c414b07899e6.tar.bz2 linux-103423ad7e56d6c756738823c332c414b07899e6.zip | |
arm64: Get rid of ARM64_HAS_NO_HW_PREFETCH
Back in 2016, it was argued that implementations lacking a HW
prefetcher could be helped by sprinkling a number of PRFM
instructions in strategic locations.
In 2023, the one platform that presumably needed this hack is no
longer in active use (let alone maintained), and an quick
experiment shows dropping this hack only leads to a 0.4% drop
on a full kernel compilation (tested on a MT30-GS0 48 CPU system).
Given that this is pretty much in the noise department and that
it may give odd ideas to other implementers, drop the hack for
good.
Suggested-by: Will Deacon <will@kernel.org>
Suggested-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Link: https://lore.kernel.org/r/20231122133754.1240687-1-maz@kernel.org
Signed-off-by: Will Deacon <will@kernel.org>
Diffstat (limited to 'arch/arm64/tools')
| -rw-r--r-- | arch/arm64/tools/cpucaps | 1 |
1 files changed, 0 insertions, 1 deletions
diff --git a/arch/arm64/tools/cpucaps b/arch/arm64/tools/cpucaps index b98c38288a9d..0eb2a2d2f783 100644 --- a/arch/arm64/tools/cpucaps +++ b/arch/arm64/tools/cpucaps @@ -40,7 +40,6 @@ HAS_LDAPR HAS_LSE_ATOMICS HAS_MOPS HAS_NESTED_VIRT -HAS_NO_HW_PREFETCH HAS_PAN HAS_S1PIE HAS_RAS_EXTN |