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 5/5] perf/hw_breakpoint: Simplify breakpoint enable in perf_event_modify_breakpoint
Date: Fri, 10 Aug 2018 12:47:30 +0200 [thread overview]
Message-ID: <20180810104730.3293-6-jolsa@kernel.org> (raw)
In-Reply-To: <20180810104730.3293-1-jolsa@kernel.org>
We can safely enable the breakpoint back for both the fail
and success paths by checking only the bp->attr.disabled,
which either holds the new 'requested' disabled state or
the original breakpoint state.
Suggested-by: Oleg Nesterov <oleg@redhat.com>
Link: http://lkml.kernel.org/n/tip-vo1jm1u2nar6lj6hnd9g73ug@git.kernel.org
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
---
kernel/events/core.c | 11 +++--------
1 file changed, 3 insertions(+), 8 deletions(-)
diff --git a/kernel/events/core.c b/kernel/events/core.c
index f6ea33a9f904..22ede28ec07d 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -2867,16 +2867,11 @@ static int perf_event_modify_breakpoint(struct perf_event *bp,
_perf_event_disable(bp);
err = modify_user_hw_breakpoint_check(bp, attr, true);
- if (err) {
- if (!bp->attr.disabled)
- _perf_event_enable(bp);
- return err;
- }
-
- if (!attr->disabled)
+ if (!bp->attr.disabled)
_perf_event_enable(bp);
- return 0;
+
+ return err;
}
static int perf_event_modify_attr(struct perf_event *event,
--
2.17.1
next prev parent reply other threads:[~2018-08-10 10:47 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-08-10 10:47 [PATCHv3 0/5] perf/hw_breakpoint: Fix breakpoint modify Jiri Olsa
2018-08-10 10:47 ` [PATCH 1/5] perf tests: Add breakpoint modify tests Jiri Olsa
2018-08-10 10:47 ` [PATCH 2/5] perf/hw_breakpoint: Modify breakpoint even if the new attr has disabled set Jiri Olsa
2018-08-17 14:27 ` Frederic Weisbecker
2018-08-10 10:47 ` [PATCH 3/5] perf/hw_breakpoint: Remove superfluous bp->attr.disabled = 0 Jiri Olsa
2018-08-17 14:47 ` Frederic Weisbecker
2018-08-10 10:47 ` [PATCH 4/5] perf/hw_breakpoint: Enable breakpoint in modify_user_hw_breakpoint Jiri Olsa
2018-08-14 10:32 ` Oleg Nesterov
2018-08-17 14:50 ` Frederic Weisbecker
2018-08-10 10:47 ` Jiri Olsa [this message]
2018-08-14 10:32 ` [PATCH 5/5] perf/hw_breakpoint: Simplify breakpoint enable in perf_event_modify_breakpoint Oleg Nesterov
2018-08-17 11:48 ` [PATCHv3 0/5] perf/hw_breakpoint: Fix breakpoint modify Jiri Olsa
2018-08-27 9:12 [PATCHv4 " Jiri Olsa
2018-08-27 9:12 ` [PATCH 5/5] perf/hw_breakpoint: Simplify breakpoint enable in perf_event_modify_breakpoint Jiri Olsa
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20180810104730.3293-6-jolsa@kernel.org \
--to=jolsa@kernel.org \
--cc=a.p.zijlstra@chello.nl \
--cc=acme@kernel.org \
--cc=alexander.shishkin@linux.intel.com \
--cc=chabbi.milind@gmail.com \
--cc=dsahern@gmail.com \
--cc=frederic@kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=mingo@kernel.org \
--cc=namhyung@kernel.org \
--cc=oleg@redhat.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).