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ANDROID: arm64: Disable workaround for CPU errata 2441007 and 2441009

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CPU errata 2441007 (Cortex-A55) and 2441009 (Cortex-A510) are categorised
as "rare" by Arm and consequently the workaround is not intended to be
deployed in practice as the issue is not expected to occur in real-world
environments.

Given that the cost of the workaround, which issues additional broadcast
TLB invalidation requests, has been shown to impact kswapd significantly
on Pixel devices, disable the workaround following Arm's recommendation.

Bug: 306231846
Signed-off-by: Will Deacon <willdeacon@google.com>
Change-Id: I39b6d9736cfa79827321151b45774f62c8d1a747
(cherry picked from commit 4ba6c3197cb6f0e11cb8af10bb0924ba9d73c110)
This commit is contained in:
Will Deacon 2023-12-11 19:53:17 +00:00
parent 2d8a5ddebb
commit a9567a35d0
1 changed files with 0 additions and 2 deletions
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arch/arm64/Kconfig
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@ -642,7 +642,6 @@ config ARM64_WORKAROUND_REPEAT_TLBI
config ARM64_ERRATUM_2441007
bool "Cortex-A55: Completion of affected memory accesses might not be guaranteed by completion of a TLBI"
default y
select ARM64_WORKAROUND_REPEAT_TLBI
help
This option adds a workaround for ARM Cortex-A55 erratum #2441007.
@ -881,7 +880,6 @@ config ARM64_ERRATUM_2224489
config ARM64_ERRATUM_2441009
bool "Cortex-A510: Completion of affected memory accesses might not be guaranteed by completion of a TLBI"
default y
select ARM64_WORKAROUND_REPEAT_TLBI
help
This option adds a workaround for ARM Cortex-A510 erratum #2441009.