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

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commit 804234f271 upstream.

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@intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: David S. Miller <davem@davemloft.net>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Leo Yan <leo.yan@linaro.org>
Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Wang Nan <wangnan0@huawei.com>
Cc: stable@vger.kernel.org # 4.19
Link: https://lkml.kernel.org/n/tip-vcz4ufzdon7cwy8dm2ua53xk@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Arnaldo Carvalho de Melo 2018-11-27 11:45:49 -03:00 committed by Greg Kroah-Hartman
parent d124dd5c6a
commit 65e4e67de3
1 changed files with 1 additions and 1 deletions
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2
tools/perf/util/env.c
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@ -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;