[OE-core] [PATCH v2 1/1] latencytop: fix mount error

[Roxana Ciobanu]

Bug was fixed by redirecting stderr to /dev/null. The error was
caused because /sys/kernel/debug was already mounted by sysfs.sh.

[ YOCTO #6498 ]

Signed-off-by: Roxana Ciobanu <roxana.ciobanu at intel.com>
---
 .../latencytop/latencytop-0.5/latencytop-fsync-mount.patch  | 13 +++++++++++++
 meta/recipes-kernel/latencytop/latencytop_0.5.bb            |  5 +++--
 2 files changed, 16 insertions(+), 2 deletions(-)
 create mode 100644 meta/recipes-kernel/latencytop/latencytop-0.5/latencytop-fsync-mount.patch

diff --git a/meta/recipes-kernel/latencytop/latencytop-0.5/latencytop-fsync-mount.patch b/meta/recipes-kernel/latencytop/latencytop-0.5/latencytop-fsync-mount.patch
new file mode 100644
index 0000000..043be75
--- /dev/null
+++ b/meta/recipes-kernel/latencytop/latencytop-0.5/latencytop-fsync-mount.patch
@@ -0,0 +1,13 @@
+Index: latencytop-0.5/fsync.c
+===================================================================
+--- latencytop-0.5.orig/fsync.c
++++ latencytop-0.5/fsync.c
+@@ -151,7 +151,7 @@ int enable_fsync_tracer(void)
+  * echo ftrace_printk > iter_ctrl 
+  * echo 1 > tracing_on
+  */
+-	ret = system("/bin/mount -t debugfs none /sys/kernel/debug/");
++	ret = system("/bin/mount -t debugfs none /sys/kernel/debug/ 2>/dev/null");
+ 	if (!ret) 
+ 		return -1;
+ 	write_to_file("/sys/kernel/debug/tracing/current_tracer", "fsync");	
diff --git a/meta/recipes-kernel/latencytop/latencytop_0.5.bb b/meta/recipes-kernel/latencytop/latencytop_0.5.bb
index 516e2c5..9a95b92 100644
--- a/meta/recipes-kernel/latencytop/latencytop_0.5.bb
+++ b/meta/recipes-kernel/latencytop/latencytop_0.5.bb
@@ -6,11 +6,12 @@ LIC_FILES_CHKSUM = "file://latencytop.c;endline=23;md5=ee9ea9b1415356e5734adad4a
 
 DEPENDS = "virtual/libintl ncurses glib-2.0  ${@bb.utils.contains('DISTRO_FEATURES', 'x11', 'gtk+', '', d)}"
 
-PR = "r3"
+PR = "r4"
 
 SRC_URI = "http://www.latencytop.org/download/latencytop-${PV}.tar.gz \
             file://latencytop-makefile.patch \
-            file://latencytop-fsync.patch"
+            file://latencytop-fsync.patch \
+            file://latencytop-fsync-mount.patch"
 
 SRC_URI[md5sum] = "73bb3371c6ee0b0e68e25289027e865c"
 SRC_URI[sha256sum] = "9e7f72fbea7bd918e71212a1eabaad8488d2c602205d2e3c95d62cd57e9203ef"
-- 
1.9.1