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Diffstat (limited to 'Documentation/dev-tools/kcsan.rst')
| -rw-r--r-- | Documentation/dev-tools/kcsan.rst | 24 |
1 files changed, 17 insertions, 7 deletions
diff --git a/Documentation/dev-tools/kcsan.rst b/Documentation/dev-tools/kcsan.rst index a6f4f92df2fa..65a0be513b7d 100644 --- a/Documentation/dev-tools/kcsan.rst +++ b/Documentation/dev-tools/kcsan.rst @@ -101,18 +101,28 @@ instrumentation or e.g. DMA accesses. Selective analysis ~~~~~~~~~~~~~~~~~~ -To disable KCSAN data race detection for an entire subsystem, add to the -respective ``Makefile``:: +It may be desirable to disable data race detection for specific accesses, +functions, compilation units, or entire subsystems. For static blacklisting, +the below options are available: - KCSAN_SANITIZE := n +* KCSAN understands the ``data_race(expr)`` annotation, which tells KCSAN that + any data races due to accesses in ``expr`` should be ignored and resulting + behaviour when encountering a data race is deemed safe. + +* Disabling data race detection for entire functions can be accomplished by + using the function attribute ``__no_kcsan`` (or ``__no_kcsan_or_inline`` for + ``__always_inline`` functions). To dynamically control for which functions + data races are reported, see the `debugfs`_ blacklist/whitelist feature. -To disable KCSAN on a per-file basis, add to the ``Makefile``:: +* To disable data race detection for a particular compilation unit, add to the + ``Makefile``:: KCSAN_SANITIZE_file.o := n -KCSAN also understands the ``data_race(expr)`` annotation, which tells KCSAN -that any data races due to accesses in ``expr`` should be ignored and resulting -behaviour when encountering a data race is deemed safe. +* To disable data race detection for all compilation units listed in a + ``Makefile``, add to the respective ``Makefile``:: + + KCSAN_SANITIZE := n debugfs ~~~~~~~ |