| From | Kamal Mostafa <> | Subject | [PATCH 3.13.y-ckt 14/97] perf tools: Dont stop PMU parsing on alias parse error | Date | Mon, 4 Apr 2016 16:25:38 -0700 |
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3.13.11-ckt38 -stable review patch. If anyone has any objections, please let me know.
---8<------------------------------------------------------------
From: Andi Kleen <ak@linux.intel.com>
commit 940db6dcd3f4659303fdf6befe7416adc4d24118 upstream.
When an error happens during alias parsing currently the complete parsing of all attributes of the PMU is stopped. This is breaks old perf on a newer kernel that may have not-yet-know alias attributes (such as .scale or .per-pkg).
Continue when some attribute is unparseable.
This is IMHO a stable candidate and should be backported to older versions to avoid problems with newer kernels.
v2: Print warnings when something goes wrong. v3: Change warning to debug output
Signed-off-by: Andi Kleen <ak@linux.intel.com> Cc: Jiri Olsa <jolsa@kernel.org> Link: http://lkml.kernel.org/r/1455749095-18358-1-git-send-email-andi@firstfloor.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> [ kamal: backport to 3.13-stable: context ] Signed-off-by: Kamal Mostafa <kamal@canonical.com> --- tools/perf/util/pmu.c | 16 +++++++++------- 1 file changed, 9 insertions(+), 7 deletions(-)
diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c index c232d8d..2febc09 100644 --- a/tools/perf/util/pmu.c +++ b/tools/perf/util/pmu.c @@ -129,13 +129,12 @@ static int pmu_aliases_parse(char *dir, struct list_head *head) { struct dirent *evt_ent; DIR *event_dir; - int ret = 0; event_dir = opendir(dir); if (!event_dir) return -EINVAL; - while (!ret && (evt_ent = readdir(event_dir))) { + while ((evt_ent = readdir(event_dir))) { char path[PATH_MAX]; char *name = evt_ent->d_name; FILE *file; @@ -145,16 +144,19 @@ static int pmu_aliases_parse(char *dir, struct list_head *head) snprintf(path, PATH_MAX, "%s/%s", dir, name); - ret = -EINVAL; file = fopen(path, "r"); - if (!file) - break; - ret = perf_pmu__new_alias(head, name, file); + if (!file) { + pr_debug("Cannot open %s\n", path); + continue; + } + + if (perf_pmu__new_alias(head, name, file) < 0) + pr_debug("Cannot set up %s\n", name); fclose(file); } closedir(event_dir); - return ret; + return 0; } /* -- 2.7.4
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