CONFIG_ARM64_ERRATUM_2441007: Cortex-A55: Completion of affected memory accesses might not be guaranteed by completion of a TLBI (rare)

General informations

The Linux kernel configuration item CONFIG_ARM64_ERRATUM_2441007 has multiple definitions:

Cortex-A55: Completion of affected memory accesses might not be guaranteed by completion of a TLBI (rare) found in arch/arm64/Kconfig

The configuration item CONFIG_ARM64_ERRATUM_2441007:

• prompt: Cortex-A55: Completion of affected memory accesses might not be guaranteed by completion of a TLBI (rare)
• type: bool
• depends on: (none)
• defined in arch/arm64/Kconfig
• found in Linux kernels: 6.9-rc+HEAD

Help text

This option adds a workaround for ARM Cortex-A55 erratum #2441007.

Under very rare circumstances, affected Cortex-A55 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 N.

Cortex-A55: Completion of affected memory accesses might not be guaranteed by completion of a TLBI found in arch/arm64/Kconfig

The configuration item CONFIG_ARM64_ERRATUM_2441007:

• prompt: Cortex-A55: Completion of affected memory accesses might not be guaranteed by completion of a TLBI
• type: bool
• depends on: (none)
• defined in arch/arm64/Kconfig
• found in Linux kernels: 6.1–6.8

Help text

This option adds a workaround for ARM Cortex-A55 erratum #2441007.

Under very rare circumstances, affected Cortex-A55 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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The data is retrived from:

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• Linux Kernel Driver DataBase (LKDDb)

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