[PATCH 4/5 -mm] fault-injection: optimize and simplify should_fail()

[Don Mullis <dwm@meer.net>]

Trivial optimization and simplification of should_fail().

Do cheaper disqualification tests first (performance gain not quantified).
Simplify logic; eliminate goto.

Signed-off-by: Don Mullis <dwm@meer.net>
Cc: Akinobu Mita <akinobu.mita@gmail.com>
---
 lib/fault-inject.c |   11 ++++-------
 1 file changed, 4 insertions(+), 7 deletions(-)

Index: linux-2.6.18/lib/fault-inject.c
===================================================================
--- linux-2.6.18.orig/lib/fault-inject.c
+++ linux-2.6.18/lib/fault-inject.c
@@ -142,9 +142,6 @@ bool should_fail(struct fault_attr *attr
 	if (attr->task_filter && !fail_task(attr, current))
 		return false;
 
-	if (!fail_stacktrace(attr))
-		return false;
-
 	if (atomic_read(&attr->times) == 0)
 		return false;
 
@@ -159,12 +156,12 @@ bool should_fail(struct fault_attr *attr
 			return false;
 	}
 
-	if (attr->probability > random32() % 100)
-		goto fail;
+	if (attr->probability <= random32() % 100)
+		return false;
 
-	return false;
+	if (!fail_stacktrace(attr))
+		return false;
 
-fail:
 	fail_dump(attr);
 
 	if (atomic_read(&attr->times) != -1)


-
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