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@xxxxxxxxxxxxxxx> know about it.
>From e72e2dfe7c16ffbfbabf9cb24adc6d9f93a4fe37 Mon Sep 17 00:00:00 2001
From: Arnd Bergmann <arnd@xxxxxxxx>
Date: Mon, 25 Apr 2016 17:35:31 +0200
Subject: gcov: disable -Wmaybe-uninitialized warning
From: Arnd Bergmann <arnd@xxxxxxxx>
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@xxxxxxxx>
Acked-by: Peter Oberparleiter <oberpar@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Michal Marek <mmarek@xxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
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@xxxxxxxx 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
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