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CONFIG_X86_PPRO_FENCE: PentiumPro memory ordering errata workaround

General informations

The Linux kernel configuration item CONFIG_X86_PPRO_FENCE has multiple definitions:

found in arch/i386/Kconfig.cpu

The configuration item CONFIG_X86_PPRO_FENCE:

Help text

(none)

found in arch/i386/Kconfig

The configuration item CONFIG_X86_PPRO_FENCE:

Help text

(none)

found in arch/x86/Kconfig.cpu

The configuration item CONFIG_X86_PPRO_FENCE:

Help text

(none)

PentiumPro memory ordering errata workaround found in arch/x86/Kconfig.cpu

The configuration item CONFIG_X86_PPRO_FENCE:

Help text

Old PentiumPro multiprocessor systems had errata that could cause memory operations to violate the x86 ordering standard in rare cases. Enabling this option will attempt to work around some (but not all) occurrences of this problem, at the cost of much heavier spinlock and memory barrier operations.

If unsure, say n here. Even distro kernels should think twice before enabling this: there are few systems, and an unlikely bug.

Hardware

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