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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2024-05-13 10:13:39 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2024-05-13 10:13:39 -0700 |
| commit | c07ea940a011343fdaec12cd74b4ff947ba6f893 (patch) | |
| tree | 2c3f2cba024008409e948d56e29c58697af918f8 /Documentation/dev-tools | |
| parent | ee20260136095c8037d8f94f0471eb9f7e3da99f (diff) | |
| parent | 31f605a308e627f06e4e6ab77254473f1c90f0bf (diff) | |
| download | linux-c07ea940a011343fdaec12cd74b4ff947ba6f893.tar.gz | |
Merge tag 'kcsan.2024.05.10a' of git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu
Pull kcsan update from Paul McKenney:
"Introduce __data_racy type qualifier
This adds a __data_racy type qualifier that enables kernel developers
to inform KCSAN that a given variable is a shared variable without
needing to mark each and every access.
This allows pre-KCSAN code to be correctly (if approximately)
instrumented withh very little effort, and also provides people
reading the code a clear indication that the variable is in fact
shared.
In addition, it permits incremental transition to per-access KCSAN
marking, so that (for example) a given subsystem can be transitioned
one variable at a time, while avoiding large numbers of KCSAN warnings
during this transition"
* tag 'kcsan.2024.05.10a' of git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu:
kcsan, compiler_types: Introduce __data_racy type qualifier
Diffstat (limited to 'Documentation/dev-tools')
| -rw-r--r-- | Documentation/dev-tools/kcsan.rst | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/Documentation/dev-tools/kcsan.rst b/Documentation/dev-tools/kcsan.rst index 94b6802ab0ab23..02143f060b22f0 100644 --- a/Documentation/dev-tools/kcsan.rst +++ b/Documentation/dev-tools/kcsan.rst @@ -91,6 +91,16 @@ the below options are available: behaviour when encountering a data race is deemed safe. Please see `"Marking Shared-Memory Accesses" in the LKMM`_ for more information. +* Similar to ``data_race(...)``, the type qualifier ``__data_racy`` can be used + to document that all data races due to accesses to a variable are intended + and should be ignored by KCSAN:: + + struct foo { + ... + int __data_racy stats_counter; + ... + }; + * Disabling data race detection for entire functions can be accomplished by using the function attribute ``__no_kcsan``:: |