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CONFIG_ARM64_ERRATUM_819472: Cortex-A53: 819472: Store exclusive instructions might cause data corruption

General informations

The Linux kernel configuration item CONFIG_ARM64_ERRATUM_819472:

Help text

This option adds an alternative code sequence to work around ARM erratum 819472 on Cortex-A53 parts up to r0p1 with an L2 cache present when it is connected to a coherent interconnect.

If the processor is executing a load and store exclusive sequence at the same time as a processor in another cluster is executing a cache maintenance operation to the same address, then this erratum might cause data corruption.

The workaround promotes data cache clean instructions to data cache clean-and-invalidate. Please note that this does not necessarily enable the workaround, as it depends on the alternative framework, which will only patch the kernel if an affected CPU is detected.

If unsure, say Y.

Hardware

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