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| author | Andrey Ryabinin | 2016-03-22 22:27:45 +0100 |
|---|---|---|
| committer | Linus Torvalds | 2016-03-22 23:36:02 +0100 |
| commit | dde5cf39d4d2cce71f2997c37210dd624d0e4bf6 (patch) | |
| tree | f6c7658913755d6d7f06be34057c2882e6b83e21 | |
| parent | kfifo: fix sparse complaints (diff) | |
| download | kernel-qcow2-linux-dde5cf39d4d2cce71f2997c37210dd624d0e4bf6.tar.gz kernel-qcow2-linux-dde5cf39d4d2cce71f2997c37210dd624d0e4bf6.tar.xz kernel-qcow2-linux-dde5cf39d4d2cce71f2997c37210dd624d0e4bf6.zip | |
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@virtuozzo.com>
Reported-by: Fengguang Wu <fengguang.wu@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | lib/Kconfig.ubsan | 5 | ||||
| -rw-r--r-- | scripts/Makefile.ubsan | 4 |
2 files changed, 9 insertions, 0 deletions
diff --git a/lib/Kconfig.ubsan b/lib/Kconfig.ubsan index e07c1ba9ba13..39494af9a84a 100644 --- a/lib/Kconfig.ubsan +++ b/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 --git a/scripts/Makefile.ubsan b/scripts/Makefile.ubsan index 8ab68679cfb5..77ce538268b5 100644 --- a/scripts/Makefile.ubsan +++ b/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 |