CONFIG_KCSAN_WEAK_MEMORY: Enable weak memory modeling to detect missing memory barriers

General informations

The Linux kernel configuration item CONFIG_KCSAN_WEAK_MEMORY:

• prompt: Enable weak memory modeling to detect missing memory barriers
• type: bool
• depends on: ( CONFIG_KCSAN_STRICT ) && (! CONFIG_ARCH_WANTS_NO_INSTR || CONFIG_HAVE_NOINSTR_HACK || \)
• defined in lib/Kconfig.kcsan
• found in Linux kernels: 5.17–5.19, 6.0–6.8, 6.9-rc+HEAD

Help text

Enable support for modeling a subset of weak memory, which allows detecting a subset of data races due to missing memory barriers.

Depends on KCSAN_STRICT, because the options strengthening certain plain accesses by default (depending on !KCSAN_STRICT) reduce the ability to detect any data races invoving reordered accesses, in particular reordered writes.

Weak memory modeling relies on additional instrumentation and may affect performance.

Hardware

LKDDb

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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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