kcsan: Add current->state to implicitly atomic accesses

Browse source

Add volatile current->state to list of implicitly atomic accesses. This
is in preparation to eventually enable KCSAN on kernel/sched (which
currently still has KCSAN_SANITIZE := n).

Since accesses that match the special check in atomic.h are rare, it
makes more sense to move this check to the slow-path, avoiding the
additional compare in the fast-path. With the microbenchmark, a speedup
of ~6% is measured.

Signed-off-by: Marco Elver <elver@google.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>

...

This commit is contained in:

Marco Elver 2020-02-25 15:32:58 +01:00 • committed by Paul E. McKenney

parent 2402d0eae5

commit 44656d3dc4

3 changed files with 40 additions and 30 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

21

kernel/kcsan/atomic.h

View file

22

kernel/kcsan/core.c

View file

27

kernel/kcsan/debugfs.c

View file