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perf/hw_breakpoint: Enable breakpoint in modify_user_hw_breakpoint

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Currently we enable the breakpoint back only if the breakpoint
modification was successful. If it fails we can leave the breakpoint in
disabled state with attr->disabled == 0.

We can safely enable the breakpoint back for both the fail and success
paths by checking the bp->attr.disabled, which either holds the new
'requested' disabled state or the original breakpoint state.

Suggested-by: Oleg Nesterov <[email protected]>
Signed-off-by: Jiri Olsa <[email protected]>
Acked-by: Frederic Weisbecker <[email protected]>
Acked-by: Oleg Nesterov <[email protected]>
Tested-by: Arnaldo Carvalho de Melo <[email protected]>
Cc: Alexander Shishkin <[email protected]>
Cc: David Ahern <[email protected]>
Cc: Milind Chabbi <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>
This commit is contained in:
Jiri Olsa 2018-08-27 11:12:27 +02:00 • committed by Arnaldo Carvalho de Melo
commit 969558371b
1 changed files with 2 additions and 4 deletions
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6
kernel/events/hw_breakpoint.c
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@ -523,13 +523,11 @@ int modify_user_hw_breakpoint(struct perf_event *bp, struct perf_event_attr *att
perf_event_disable(bp);
err = modify_user_hw_breakpoint_check(bp, attr, false);
if (err)
return err;
if (!attr->disabled)
if (!bp->attr.disabled)
perf_event_enable(bp);
return 0;
return err;
}
EXPORT_SYMBOL_GPL(modify_user_hw_breakpoint);