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| author | Will Deacon <will@kernel.org> | 2024-02-09 18:39:16 +0000 |
|---|---|---|
| committer | Catalin Marinas <catalin.marinas@arm.com> | 2024-02-20 17:55:00 +0000 |
| commit | 8c10cc104b73abdfd87a23ae50b1c90c2c917027 (patch) | |
| tree | 9c462c667c5e44877afa5bd34309c9da5b0f80bd /Documentation/arch | |
| parent | 54be6c6c5ae8e0d93a6c4641cb7528eb0b6ba478 (diff) | |
| download | linux-8c10cc104b73abdfd87a23ae50b1c90c2c917027.tar.gz | |
arm64: errata: Don't enable workarounds for "rare" errata by default
Arm classifies some of its CPU errata as "rare", indicating that the
hardware error is unlikely to occur in practice. Given that the cost of
errata workarounds can often be significant in terms of power and
performance, don't enable workarounds for "rare" errata by default and
update our documentation to reflect that.
Cc: James Morse <james.morse@arm.com>
Signed-off-by: Will Deacon <will@kernel.org>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Link: https://lore.kernel.org/r/20240209183916.25860-1-will@kernel.org
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'Documentation/arch')
| -rw-r--r-- | Documentation/arch/arm64/silicon-errata.rst | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/Documentation/arch/arm64/silicon-errata.rst b/Documentation/arch/arm64/silicon-errata.rst index e8c2ce1f9df68d..fa16b895c997c9 100644 --- a/Documentation/arch/arm64/silicon-errata.rst +++ b/Documentation/arch/arm64/silicon-errata.rst @@ -35,8 +35,9 @@ can be triggered by Linux). For software workarounds that may adversely impact systems unaffected by the erratum in question, a Kconfig entry is added under "Kernel Features" -> "ARM errata workarounds via the alternatives framework". -These are enabled by default and patched in at runtime when an affected -CPU is detected. For less-intrusive workarounds, a Kconfig option is not +With the exception of workarounds for errata deemed "rare" by Arm, these +are enabled by default and patched in at runtime when an affected CPU is +detected. For less-intrusive workarounds, a Kconfig option is not available and the code is structured (preferably with a comment) in such a way that the erratum will not be hit. |