linux-kernel - [tip:perf/core] perf env: Also consider env->arch == NULL as local operation

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Date:   Fri, 14 Dec 2018 12:21:16 -0800
From:   tip-bot for Arnaldo Carvalho de Melo <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     wangnan0@...wei.com, dsahern@...il.com, adrian.hunter@...el.com,
        tglx@...utronix.de, mingo@...nel.org, linux-kernel@...r.kernel.org,
        namhyung@...nel.org, mathieu.poirier@...aro.org,
        ak@...ux.intel.com, leo.yan@...aro.org, davem@...emloft.net,
        hpa@...or.com, acme@...hat.com, jolsa@...hat.com
Subject: [tip:perf/core] perf env: Also consider env->arch == NULL as local
 operation

Commit-ID:  ea75be393677d60dd64b976f8fc91763537b13c7
Gitweb:     https://git.kernel.org/tip/ea75be393677d60dd64b976f8fc91763537b13c7
Author:     Arnaldo Carvalho de Melo <acme@...hat.com>
AuthorDate: Tue, 27 Nov 2018 11:45:49 -0300
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Thu, 29 Nov 2018 20:42:47 -0300

perf env: Also consider env->arch == NULL as local operation

We'll set a new machine field based on env->arch, which for live mode,
like with 'perf top' means we need to use uname() to figure the name of
the arch, fix perf_env__arch() to consider both (env == NULL) and
(env->arch == NULL) as local operation.

Cc: Adrian Hunter <adrian.hunter@...el.com>
Cc: Andi Kleen <ak@...ux.intel.com>
Cc: David Ahern <dsahern@...il.com>
Cc: David S. Miller <davem@...emloft.net>
Cc: Jiri Olsa <jolsa@...hat.com>
Cc: Leo Yan <leo.yan@...aro.org>
Cc: Mathieu Poirier <mathieu.poirier@...aro.org>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Wang Nan <wangnan0@...wei.com>
Cc: stable@...r.kernel.org # 4.19
Link: https://lkml.kernel.org/n/tip-vcz4ufzdon7cwy8dm2ua53xk@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/util/env.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/util/env.c b/tools/perf/util/env.c
index 59f38c7693f8..4c23779e271a 100644
--- a/tools/perf/util/env.c
+++ b/tools/perf/util/env.c
@@ -166,7 +166,7 @@ const char *perf_env__arch(struct perf_env *env)
 	struct utsname uts;
 	char *arch_name;
 
-	if (!env) { /* Assume local operation */
+	if (!env || !env->arch) { /* Assume local operation */
 		if (uname(&uts) < 0)
 			return NULL;
 		arch_name = uts.machine;