From: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Date: Mon, 26 Sep 2016 17:37:50 +0000 (-0400)
Subject: Performance: special-case NULL in lttng_strlen_user_inatomic
X-Git-Tag: v2.9.0-rc1~7
X-Git-Url: https://git.lttng.org./?a=commitdiff_plain;h=a824008cc30bf9a4b99aeb00657bbe2f0be9b653;p=lttng-modules.git

Performance: special-case NULL in lttng_strlen_user_inatomic

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
---

diff --git a/probes/lttng-probe-user.c b/probes/lttng-probe-user.c
index e92107d9..099a66b2 100644
--- a/probes/lttng-probe-user.c
+++ b/probes/lttng-probe-user.c
@@ -31,8 +31,12 @@
 long lttng_strlen_user_inatomic(const char *addr)
 {
 	long count = 0;
-	mm_segment_t old_fs = get_fs();
+	mm_segment_t old_fs;
 
+	if (!addr)
+		return 0;
+
+	old_fs = get_fs();
 	set_fs(KERNEL_DS);
 	pagefault_disable();
 	for (;;) {