diff options
| author |   Jiri Olsa <jolsa@kernel.org> | 2018-08-27 11:12:27 +0200 |
|---|---|---|
| committer |   Arnaldo Carvalho de Melo <acme@redhat.com> | 2018-08-30 14:49:23 -0300 |
| commit | 969558371bf926258241727ebb994f516f2e6f61 (patch) | |
| tree | 7471dca1cfa209eb41989054b121ce940d8b92b5 /kernel/events | |
| parent | perf/hw_breakpoint: Remove superfluous bp->attr.disabled = 0 (diff) | |
| download | linux-dev-969558371bf926258241727ebb994f516f2e6f61.tar.xz linux-dev-969558371bf926258241727ebb994f516f2e6f61.zip | |
perf/hw_breakpoint: Enable breakpoint in modify_user_hw_breakpoint
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 <oleg@redhat.com>
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Acked-by: Frederic Weisbecker <frederic@kernel.org>
Acked-by: Oleg Nesterov <oleg@redhat.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Milind Chabbi <chabbi.milind@gmail.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20180827091228.2878-5-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'kernel/events')
| -rw-r--r-- | kernel/events/hw_breakpoint.c | 6 |
1 files changed, 2 insertions, 4 deletions
diff --git a/kernel/events/hw_breakpoint.c b/kernel/events/hw_breakpoint.c index 3e560d7609fd..d6b56180827c 100644 --- a/kernel/events/hw_breakpoint.c +++ b/kernel/events/hw_breakpoint.c @@ -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); |