linux-kernel - [tip: perf/core] perf evsel: Avoid close(-1)

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Date:   Tue, 12 Nov 2019 11:18:15 -0000
From:   "tip-bot2 for Andi Kleen" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Andi Kleen <ak@...ux.intel.com>, Jiri Olsa <jolsa@...nel.org>,
        Kan Liang <kan.liang@...ux.intel.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Stephane Eranian <eranian@...gle.com>,
        Arnaldo Carvalho de Melo <acme@...hat.com>,
        Ingo Molnar <mingo@...nel.org>, Borislav Petkov <bp@...en8.de>,
        linux-kernel@...r.kernel.org
Subject: [tip: perf/core] perf evsel: Avoid close(-1)

The following commit has been merged into the perf/core branch of tip:

Commit-ID:     2ccfb8bc2143ca347609d1d4434176d73a78d805
Gitweb:        https://git.kernel.org/tip/2ccfb8bc2143ca347609d1d4434176d73a78d805
Author:        Andi Kleen <ak@...ux.intel.com>
AuthorDate:    Sun, 20 Oct 2019 10:51:55 -07:00
Committer:     Arnaldo Carvalho de Melo <acme@...hat.com>
CommitterDate: Wed, 06 Nov 2019 15:43:05 -03:00

perf evsel: Avoid close(-1)

In some weak fallback cases close can be called a lot with -1. Check for
this case and avoid calling close then.

This is mainly to shut up valgrind which complains about this case.

Signed-off-by: Andi Kleen <ak@...ux.intel.com>
Acked-by: Jiri Olsa <jolsa@...nel.org>
Cc: Kan Liang <kan.liang@...ux.intel.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Stephane Eranian <eranian@...gle.com>
Link: http://lore.kernel.org/lkml/20191020175202.32456-3-andi@firstfloor.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/lib/evsel.c  | 3 ++-
 tools/perf/util/evsel.c | 3 ++-
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/tools/perf/lib/evsel.c b/tools/perf/lib/evsel.c
index a8cb582..5a89857 100644
--- a/tools/perf/lib/evsel.c
+++ b/tools/perf/lib/evsel.c
@@ -120,7 +120,8 @@ void perf_evsel__close_fd(struct perf_evsel *evsel)
 
 	for (cpu = 0; cpu < xyarray__max_x(evsel->fd); cpu++)
 		for (thread = 0; thread < xyarray__max_y(evsel->fd); ++thread) {
-			close(FD(evsel, cpu, thread));
+			if (FD(evsel, cpu, thread) >= 0)
+				close(FD(evsel, cpu, thread));
 			FD(evsel, cpu, thread) = -1;
 		}
 }
diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index d831038..d445184 100644
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -1815,7 +1815,8 @@ out_close:
 	old_errno = errno;
 	do {
 		while (--thread >= 0) {
-			close(FD(evsel, cpu, thread));
+			if (FD(evsel, cpu, thread) >= 0)
+				close(FD(evsel, cpu, thread));
 			FD(evsel, cpu, thread) = -1;
 		}
 		thread = nthreads;