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arm64: Optimise the repeated TLBI workaround
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Authored by andrew on Mar 4 2026, 12:32 PM.
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Details

Summary

It has been reported that the overhead of repeating all TLBI
instructions is too large [1]. The Software Developer Errata Notices
(SDEN) for the relevant Arm CPUs have been updated so a single
"tlbi vale1is, xzr" followed by "dsb ish" is sufficient to work around
the issues.

Replace the places we repeat TLBI instructions with the new sequence.

[1] https://lore.kernel.org/linux-arm-kernel/20260218164348.2022831-1-mark.rutland@arm.com/

Sponsored by: Arm Ltd

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