linux-kernel - [tip:perf/core] perf trace: We need to consider "nr" if "__syscall

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Date:   Fri, 14 Dec 2018 12:44:12 -0800
From:   tip-bot for Arnaldo Carvalho de Melo <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     jolsa@...nel.org, dsahern@...il.com, mingo@...nel.org,
        adrian.hunter@...el.com, hpa@...or.com, wangnan0@...wei.com,
        tglx@...utronix.de, acme@...hat.com, namhyung@...nel.org,
        treeze.taeung@...il.com, linux-kernel@...r.kernel.org
Subject: [tip:perf/core] perf trace: We need to consider "nr" if
 "__syscall_nr" is not there

Commit-ID:  3e9c3a56674b5e87031c9d462ec2c6156efe442b
Gitweb:     https://git.kernel.org/tip/3e9c3a56674b5e87031c9d462ec2c6156efe442b
Author:     Arnaldo Carvalho de Melo <acme@...hat.com>
AuthorDate: Wed, 5 Dec 2018 13:08:11 -0300
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Thu, 6 Dec 2018 14:12:32 -0300

perf trace: We need to consider "nr" if "__syscall_nr" is not there

To cope with older kernels that don't have this patch backported:

  026842d148b9 ("tracing/syscalls: Rename "/format" tracepoint field name "nr" to "__syscall_nr:")

This makes 'perf trace' work again in RHEL7 kernels.

Cc: Taeung Song <treeze.taeung@...il.com>
Cc: Adrian Hunter <adrian.hunter@...el.com>
Cc: David Ahern <dsahern@...il.com>
Cc: Jiri Olsa <jolsa@...nel.org>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Wang Nan <wangnan0@...wei.com>
Link: https://lkml.kernel.org/n/tip-6h1syw2isegnhb1bjmtr9x9k@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/builtin-trace.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c
index 2a347ed7bdf4..98aff12af9e6 100644
--- a/tools/perf/builtin-trace.c
+++ b/tools/perf/builtin-trace.c
@@ -258,7 +258,8 @@ static int perf_evsel__init_syscall_tp(struct perf_evsel *evsel)
 	struct syscall_tp *sc = evsel->priv = malloc(sizeof(struct syscall_tp));
 
 	if (evsel->priv != NULL) {
-		if (perf_evsel__init_tp_uint_field(evsel, &sc->id, "__syscall_nr"))
+		if (perf_evsel__init_tp_uint_field(evsel, &sc->id, "__syscall_nr") &&
+		    perf_evsel__init_tp_uint_field(evsel, &sc->id, "nr"))
 			goto out_delete;
 		return 0;
 	}