kcsan: Reduce get_ctx() uses in kcsan_found_watchpoint()

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There are a number get_ctx() calls that are close to each other, which
results in poor codegen (repeated preempt_count loads).

Specifically in kcsan_found_watchpoint() (even though it's a slow-path)
it is beneficial to keep the race-window small until the watchpoint has
actually been consumed to avoid missed opportunities to report a race.

Let's clean it up a bit before we add more code in
kcsan_found_watchpoint().

Signed-off-by: Marco Elver <elver@google.com>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>

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Marco Elver 2021-06-07 14:56:50 +02:00 • committed by Paul E. McKenney

parent e675d2533a

commit 08cac60494

1 changed files with 16 additions and 10 deletions

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kernel/kcsan/core.c

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