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| author | Marco Elver <elver@google.com> | 2020-02-04 18:21:11 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2020-03-21 09:42:21 +0100 |
| commit | a249a73231e2e30944b948c5351025e5ff65f6d1 (patch) | |
| tree | 20da47907328cf687c874c123661cec4147a2a00 /lib/Kconfig.kcsan | |
| parent | 1e6ee2f0fe8ae682757960edf455e99f611268a0 (diff) | |
| download | lwn-a249a73231e2e30944b948c5351025e5ff65f6d1.tar.gz lwn-a249a73231e2e30944b948c5351025e5ff65f6d1.zip | |
kcsan: Clarify Kconfig option KCSAN_IGNORE_ATOMICS
Clarify difference between options KCSAN_IGNORE_ATOMICS and
KCSAN_ASSUME_PLAIN_WRITES_ATOMIC in help text.
Signed-off-by: Marco Elver <elver@google.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'lib/Kconfig.kcsan')
| -rw-r--r-- | lib/Kconfig.kcsan | 16 |
1 files changed, 13 insertions, 3 deletions
diff --git a/lib/Kconfig.kcsan b/lib/Kconfig.kcsan index 66126853dab0..020ac63e4361 100644 --- a/lib/Kconfig.kcsan +++ b/lib/Kconfig.kcsan @@ -132,8 +132,18 @@ config KCSAN_ASSUME_PLAIN_WRITES_ATOMIC config KCSAN_IGNORE_ATOMICS bool "Do not instrument marked atomic accesses" help - If enabled, never instruments marked atomic accesses. This results in - not reporting data races where one access is atomic and the other is - a plain access. + Never instrument marked atomic accesses. This option can be used for + additional filtering. Conflicting marked atomic reads and plain + writes will never be reported as a data race, however, will cause + plain reads and marked writes to result in "unknown origin" reports. + If combined with CONFIG_KCSAN_REPORT_RACE_UNKNOWN_ORIGIN=n, data + races where at least one access is marked atomic will never be + reported. + + Similar to KCSAN_ASSUME_PLAIN_WRITES_ATOMIC, but including unaligned + accesses, conflicting marked atomic reads and plain writes will not + be reported as data races; however, unlike that option, data races + due to two conflicting plain writes will be reported (aligned and + unaligned, if CONFIG_KCSAN_ASSUME_PLAIN_WRITES_ATOMIC=n). endif # KCSAN |