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Merge tag 'kcsan.2024.05.10a' of git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu

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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
This commit is contained in:
Linus Torvalds
2024-05-13 10:13:39 -07:00
parent ee20260136 31f605a308
commit c07ea940a0
3 changed files with 34 additions and 0 deletions
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Documentation/dev-tools/kcsan.rst
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@@ -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``::