From: Jiri Olsa <jolsa@kernel.org>
To: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: lkml <linux-kernel@vger.kernel.org>,
Ingo Molnar <mingo@kernel.org>,
Namhyung Kim <namhyung@kernel.org>,
David Ahern <dsahern@gmail.com>,
Alexander Shishkin <alexander.shishkin@linux.intel.com>,
Peter Zijlstra <a.p.zijlstra@chello.nl>,
Milind Chabbi <chabbi.milind@gmail.com>,
Oleg Nesterov <oleg@redhat.com>,
Frederic Weisbecker <frederic@kernel.org>
Subject: [PATCH 4/5] perf/hw_breakpoint: Set breakpoint as disabled in modify_user_hw_breakpoint error path
Date: Thu, 9 Aug 2018 14:03:04 +0200 [thread overview]
Message-ID: <20180809120305.20693-5-jolsa@kernel.org> (raw)
In-Reply-To: <20180809120305.20693-1-jolsa@kernel.org>
When we failed to modify breakpoint, we ended up with
disabled event. Mirror that in its 'attr.disabled',
because some parts of the ptrace code depends on it.
Link: http://lkml.kernel.org/n/tip-rp81jgq4rx19ozxm9decxq98@git.kernel.org
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
---
kernel/events/hw_breakpoint.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/kernel/events/hw_breakpoint.c b/kernel/events/hw_breakpoint.c
index 3e560d7609fd..eff7ab716139 100644
--- a/kernel/events/hw_breakpoint.c
+++ b/kernel/events/hw_breakpoint.c
@@ -523,8 +523,10 @@ 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)
+ if (err) {
+ bp->attr.disabled = 1;
return err;
+ }
if (!attr->disabled)
perf_event_enable(bp);
--
2.17.1
next prev parent reply other threads:[~2018-08-09 12:03 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-08-09 12:03 [PATCHv2 0/5] perf/hw_breakpoint: Fix breakpoint modify Jiri Olsa
2018-08-09 12:03 ` [PATCH 1/5] perf tests: Add breakpoint modify tests Jiri Olsa
2018-08-09 12:03 ` [PATCH 2/5] perf/hw_breakpoint: Modify breakpoint even if the new attr has disabled set Jiri Olsa
2018-08-09 12:03 ` [PATCH 3/5] perf/hw_breakpoint: Remove superfluous bp->attr.disabled = 0 Jiri Olsa
2018-08-09 13:59 ` Oleg Nesterov
2018-08-09 12:03 ` Jiri Olsa [this message]
2018-08-09 14:17 ` [PATCH 4/5] perf/hw_breakpoint: Set breakpoint as disabled in modify_user_hw_breakpoint error path Oleg Nesterov
2018-08-09 16:30 ` Jiri Olsa
2018-08-28 14:29 ` Arnaldo Carvalho de Melo
2018-08-28 14:38 ` Jiri Olsa
2018-08-28 14:39 ` Arnaldo Carvalho de Melo
2018-08-09 12:03 ` [PATCH 5/5] perf/hw_breakpoint: Add fallback code for ptrace_set_breakpoint_addr Jiri Olsa
2018-08-28 14:25 ` [PATCHv2 0/5] perf/hw_breakpoint: Fix breakpoint modify Arnaldo Carvalho de Melo
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