Patch "gcov: disable -Wmaybe-uninitialized warning" has been added to the 4.4-stable tree

Patch "gcov: disable -Wmaybe-uninitialized warning" has been added to the 4.4-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    gcov: disable -Wmaybe-uninitialized warning

to the 4.4-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     gcov-disable-wmaybe-uninitialized-warning.patch
and it can be found in the queue-4.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From e72e2dfe7c16ffbfbabf9cb24adc6d9f93a4fe37 Mon Sep 17 00:00:00 2001
From: Arnd Bergmann <arnd@arndb.de>
Date: Mon, 25 Apr 2016 17:35:31 +0200
Subject: gcov: disable -Wmaybe-uninitialized warning

From: Arnd Bergmann <arnd@arndb.de>

commit e72e2dfe7c16ffbfbabf9cb24adc6d9f93a4fe37 upstream.

When gcov profiling is enabled, we see a lot of spurious warnings about
possibly uninitialized variables being used:

arch/arm/mm/dma-mapping.c: In function 'arm_coherent_iommu_map_page':
arch/arm/mm/dma-mapping.c:1085:16: warning: 'start' may be used uninitialized in this function [-Wmaybe-uninitialized]
drivers/clk/st/clk-flexgen.c: In function 'st_of_flexgen_setup':
drivers/clk/st/clk-flexgen.c:323:9: warning: 'num_parents' may be used uninitialized in this function [-Wmaybe-uninitialized]
kernel/cgroup.c: In function 'cgroup_mount':
kernel/cgroup.c:2119:11: warning: 'root' may be used uninitialized in this function [-Wmaybe-uninitialized]

All of these are false positives, so it seems better to just disable
the warnings whenever GCOV is enabled. Most users don't enable GCOV,
and based on a prior patch, it is now also disabled for 'allmodconfig'
builds, so there should be no downsides of doing this.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Peter Oberparleiter <oberpar@linux.vnet.ibm.com>
Signed-off-by: Michal Marek <mmarek@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 Makefile |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/Makefile
+++ b/Makefile
@@ -368,7 +368,7 @@ AFLAGS_MODULE   =
 LDFLAGS_MODULE  =
 CFLAGS_KERNEL	=
 AFLAGS_KERNEL	=
-CFLAGS_GCOV	= -fprofile-arcs -ftest-coverage -fno-tree-loop-im
+CFLAGS_GCOV	= -fprofile-arcs -ftest-coverage -fno-tree-loop-im -Wno-maybe-uninitialized
 
 
 # Use USERINCLUDE when you must reference the UAPI directories only.


Patches currently in stable-queue which might be from arnd@arndb.de are

queue-4.4/include-linux-kernel.h-change-abs-macro-so-it-uses-consistent-return-type.patch
queue-4.4/ath9k-fix-misleading-indentation.patch
queue-4.4/iwlegacy-avoid-warning-about-missing-braces.patch
queue-4.4/kbuild-disable-maybe-uninitialized-warning-for-config_profile_all_branches.patch
queue-4.4/net-caif-fix-misleading-indentation.patch
queue-4.4/nouveau-fix-nv40_perfctr_next-cleanup-regression.patch
queue-4.4/gcov-disable-wmaybe-uninitialized-warning.patch
queue-4.4/am437x-vfpe-fix-typo-in-vpfe_get_app_input_index.patch
queue-4.4/fix-build-warning-in-kernel-cpuset.c.patch
queue-4.4/reiserfs-fix-new_insert_key-may-be-used-uninitialized.patch