CONFIG_CP15_BARRIER_EMULATION: Emulate CP15 Barrier instructions

General informations

The Linux kernel configuration item CONFIG_CP15_BARRIER_EMULATION:

• prompt: Emulate CP15 Barrier instructions
• type: bool
• depends on: (none)
• defined in arch/arm64/Kconfig
• found in Linux kernels: 3.19, 4.0–4.20, 5.0–5.19, 6.0–6.8, 6.9-rc+HEAD

Help text

The CP15 barrier instructions - CP15ISB, CP15DSB, and CP15DMB - are deprecated in ARMv8 (and ARMv7). It is strongly recommended to use the ISB, DSB, and DMB instructions instead.

Say Y here to enable software emulation of these instructions for AArch32 userspace code. When this option is enabled, CP15 barrier usage is traced which can help identify software that needs updating. This feature can be controlled at runtime with the abi.cp15_barrier sysctl.

If unsure, say Y

Hardware

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Sources

This page is automaticly generated with free (libre, open) software lkddb(see lkddb-sources).

The data is retrived from:

• Linux kernel
• Linux Kernel Driver DataBase (LKDDb)

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