kcsan: Add option to assume plain aligned writes up to word size are atomic

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This adds option KCSAN_ASSUME_PLAIN_WRITES_ATOMIC. If enabled, plain
aligned writes up to word size are assumed to be atomic, and also not
subject to other unsafe compiler optimizations resulting in data races.

This option has been enabled by default to reflect current kernel-wide
preferences.

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>

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Marco Elver 2020-02-04 18:21:10 +01:00 • committed by Ingo Molnar

parent 7ad900d35b

commit 1e6ee2f0fe

2 changed files with 37 additions and 12 deletions

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22

kernel/kcsan/core.c

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27

lib/Kconfig.kcsan

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