The patch titled
Subject: ubsan: fix tree-wide -Wmaybe-uninitialized false positives
has been added to the -mm tree. Its filename is
ubsan-fix-tree-wide-wmaybe-uninitialized-false-positives.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/ubsan-fix-tree-wide-wmaybe-uninitialized-false-positives.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/ubsan-fix-tree-wide-wmaybe-uninitialized-false-positives.patch
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------------------------------------------------------
From: Andrey Ryabinin <aryabinin@xxxxxxxxxxxxx>
Subject: ubsan: fix tree-wide -Wmaybe-uninitialized false positives
-fsanitize=* options makes GCC less smart than usual and increase number
of 'maybe-uninitialized' false-positives. So this patch does two things:
* Add -Wno-maybe-uninitialized to CFLAGS_UBSAN which will disable all
such warnings for instrumented files.
* Remove CONFIG_UBSAN_SANITIZE_ALL from all[yes|mod]config builds. So
the all[yes|mod]config build goes without -fsanitize=* and still with
-Wmaybe-uninitialized.
Signed-off-by: Andrey Ryabinin <aryabinin@xxxxxxxxxxxxx>
Reported-by: Fengguang Wu <fengguang.wu@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
lib/Kconfig.ubsan | 5 +++++
scripts/Makefile.ubsan | 4 ++++
2 files changed, 9 insertions(+)
diff -puN lib/Kconfig.ubsan~ubsan-fix-tree-wide-wmaybe-uninitialized-false-positives lib/Kconfig.ubsan
--- a/lib/Kconfig.ubsan~ubsan-fix-tree-wide-wmaybe-uninitialized-false-positives
+++ a/lib/Kconfig.ubsan
@@ -13,6 +13,11 @@ config UBSAN_SANITIZE_ALL
bool "Enable instrumentation for the entire kernel"
depends on UBSAN
depends on ARCH_HAS_UBSAN_SANITIZE_ALL
+
+ # We build with -Wno-maybe-uninitilzed, but we still want to
+ # use -Wmaybe-uninitilized in allmodconfig builds.
+ # So dependsy bellow used to disable this option in allmodconfig
+ depends on !COMPILE_TEST
default y
help
This option activates instrumentation for the entire kernel.
diff -puN scripts/Makefile.ubsan~ubsan-fix-tree-wide-wmaybe-uninitialized-false-positives scripts/Makefile.ubsan
--- a/scripts/Makefile.ubsan~ubsan-fix-tree-wide-wmaybe-uninitialized-false-positives
+++ a/scripts/Makefile.ubsan
@@ -14,4 +14,8 @@ ifdef CONFIG_UBSAN
ifdef CONFIG_UBSAN_ALIGNMENT
CFLAGS_UBSAN += $(call cc-option, -fsanitize=alignment)
endif
+
+ # -fsanitize=* options makes GCC less smart than usual and
+ # increase number of 'maybe-uninitialized false-positives
+ CFLAGS_UBSAN += $(call cc-option, -Wno-maybe-uninitialized)
endif
_
Patches currently in -mm which might be from aryabinin@xxxxxxxxxxxxx are
ubsan-fix-tree-wide-wmaybe-uninitialized-false-positives.patch
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