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kcsan: Add kcsan_set_access_mask() support

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When setting up an access mask with kcsan_set_access_mask(), KCSAN will
only report races if concurrent changes to bits set in access_mask are
observed. Conveying access_mask via a separate call avoids introducing
overhead in the common-case fast-path.

Acked-by: John Hubbard <jhubbard@nvidia.com>
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>
This commit is contained in:
Marco Elver 2020-02-11 17:04:22 +01:00 • committed by Ingo Molnar
parent b738f6169f
commit 81af89e158
6 changed files with 73 additions and 5 deletions
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1
init/init_task.c
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@ -167,6 +167,7 @@ struct task_struct init_task
.atomic_next = 0,
.atomic_nest_count = 0,
.in_flat_atomic = false,
.access_mask = 0,
},
#endif
#ifdef CONFIG_TRACE_IRQFLAGS