perf/hw_breakpoint: Provide hw_breakpoint_is_used() and use in test

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Provide hw_breakpoint_is_used() to check if breakpoints are in use on
the system.

Use it in the KUnit test to verify the global state before and after a
test case.

Signed-off-by: Marco Elver <elver@google.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Dmitry Vyukov <dvyukov@google.com>
Acked-by: Ian Rogers <irogers@google.com>
Link: https://lore.kernel.org/r/20220829124719.675715-3-elver@google.com

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Marco Elver 2022-08-29 14:47:07 +02:00 • committed by Peter Zijlstra

parent 724c299c6a

commit c5b81449f9

3 changed files with 43 additions and 1 deletions

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3

include/linux/hw_breakpoint.h

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29

kernel/events/hw_breakpoint.c

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12

kernel/events/hw_breakpoint_test.c

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