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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:

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This option adds a workaround for ARM Cortex-A55 Erratum 1024718.

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

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