Excerpt from man 2 perf_event_open:
/proc/sys/kernel/perf_event_paranoid
The perf_event_paranoid file can be set to restrict access to the
performance counters.
2 allow only user-space measurements.
1 allow both kernel and user measurements (default).
0 allow access to CPU-specific data but not raw tracepoint samples.
-1 no restrictions.
require_paranoia_below() should return 0 if perf_event_paranoid is below a
specified level, the value from perf_event_paranoid is read into an
unsigned long so the incorrect value is returned when perf_event_paranoid
is set to -1.
Without this patch applied there is the same number of selftests/powerpc
which skip when /proc/sys/kernel/perf_event_paranoid is set to 1 or -1 but
no skips when set to zero.
With this patch applied there no skipped selftests/powerpc test when
/proc/sys/kernel/perf_event_paranoid is set to 0 or -1.
Signed-off-by: Cyril Bur <[email protected]>
---
tools/testing/selftests/powerpc/pmu/lib.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/tools/testing/selftests/powerpc/pmu/lib.c
b/tools/testing/selftests/powerpc/pmu/lib.c
index a361ad3..8b992fa 100644
--- a/tools/testing/selftests/powerpc/pmu/lib.c
+++ b/tools/testing/selftests/powerpc/pmu/lib.c
@@ -190,7 +190,7 @@ int parse_proc_maps(void)
bool require_paranoia_below(int level)
{
- unsigned long current;
+ long current;
char *end, buf[16];
FILE *f;
int rc;
@@ -208,7 +208,7 @@ bool require_paranoia_below(int level)
goto out_close;
}
- current = strtoul(buf, &end, 10);
+ current = strtol(buf, &end, 10);
if (end == buf) {
printf("Couldn't parse " PARANOID_PATH "?\n");
@@ -216,7 +216,7 @@ bool require_paranoia_below(int level)
}
if (current >= level)
- goto out;
+ goto out_close;
rc = 0;
out_close:
--
2.7.2
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