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CONFIG_ARM64_ERRATUM_1024718: Cortex-A55: 1024718: Update of DBM/AP bits without break before make might result in incorrect update

General informations

The Linux kernel configuration item CONFIG_ARM64_ERRATUM_1024718:

• prompt: Cortex-A55: 1024718: Update of DBM/AP bits without break before make might result in incorrect update
• type: bool
• depends on: (none)
• defined in arch/arm64/Kconfig
• found in Linux kernels: 4.17–4.20, 5.0-rc+HEAD

Help text

This option adds work around for Arm Cortex-A55 Erratum 1024718.

Affected Cortex-A55 cores (r0p0, r0p1, r1p0) could cause incorrect update of the hardware dirty bit when the DBM/AP bits are updated without a break-before-make. The work around is to disable the usage of hardware DBM locally on the affected cores. CPUs not affected by erratum will continue to use the feature.

If unsure, say Y.

Hardware

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