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CONFIG_ARM64_ERRATUM_2441009: Cortex-A510: Completion of affected memory accesses might not be guaranteed by completion of a TLBI

General informations

The Linux kernel configuration item CONFIG_ARM64_ERRATUM_2441009:

Help text

This option adds a workaround for ARM Cortex-A510 erratum #2441009.

Under very rare circumstances, affected Cortex-A510 CPUs may not handle a race between a break-before-make sequence on one CPU, and another CPU accessing the same page. This could allow a store to a page that has been unmapped.

Work around this by adding the affected CPUs to the list that needs TLB sequences to be done twice.

If unsure, say Y.

Hardware

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