ARM: 7441/1: perf: return -EOPNOTSUPP if requested mode exclusion is unavailable

wildea01 · Russell King · commit fdeb8e35fd59 · 2012-07-05T09:50:56.000+01:00
We currently return -EPERM if the user requests mode exclusion that is
not supported by the CPU. This looks pretty confusing from userspace
and is inconsistent with other architectures (ppc, x86).

This patch returns -EOPNOTSUPP instead.

Signed-off-by: Will Deacon &lt;will.deacon@arm.com&gt;
Signed-off-by: Russell King &lt;rmk+kernel@arm.linux.org.uk&gt;
diff --git a/arch/arm/kernel/perf_event.c b/arch/arm/kernel/perf_event.c
@@ -503,7 +503,7 @@ __hw_perf_event_init(struct perf_event *event)
 	     event_requires_mode_exclusion(&event->attr)) {
 		pr_debug("ARM performance counters do not support "
 			 "mode exclusion\n");
-		return -EPERM;
+		return -EOPNOTSUPP;
 	}
 
 	/*

Original file line number	Diff line number	Diff line change
`@@ -503,7 +503,7 @@ __hw_perf_event_init(struct perf_event *event)`
`503`	`503`	`event_requires_mode_exclusion(&event->attr)) {`
`504`	`504`	`pr_debug("ARM performance counters do not support "`
`505`	`505`	`"mode exclusion\n");`
`506`		`- return -EPERM;`
	`506`	`+ return -EOPNOTSUPP;`
`507`	`507`	`}`
`508`	`508`
`509`	`509`	`/*`