CONFIG_ARM_ERRATA_754327: ARM errata: no automatic Store Buffer drain

General informations

The Linux kernel configuration item CONFIG_ARM_ERRATA_754327:

• prompt: ARM errata: no automatic Store Buffer drain
• type: bool
• depends on: CONFIG_CPU_V7 && CONFIG_SMP
• defined in arch/arm/Kconfig
• found in Linux kernels: 2.6.39, 3.0–3.19, 4.0–4.20, 5.0–5.19, 6.0–6.12

Help text

This option enables the workaround for the 754327 Cortex-A9 (prior to r2p0) erratum. The Store Buffer does not have any automatic draining mechanism and therefore a livelock may occur if an external agent continuously polls a memory location waiting to observe an update. This workaround defines cpu_relax() as smp_mb(), preventing correctly written polling loops from denying visibility of updates to memory.

Hardware

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The data is retrived from:

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• Linux Kernel Driver DataBase (LKDDb)

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