kbuild: compute false-positive -Wmaybe-uninitialized cases in Kconfig

commit b303c6df80c9f8f13785aa83a0471fca7e38b24d upstream.

Since -Wmaybe-uninitialized was introduced by GCC 4.7, we have patched
various false positives:

 - commit e74fc973b6e5 ("Turn off -Wmaybe-uninitialized when building
   with -Os") turned off this option for -Os.

 - commit 815eb71e7149 ("Kbuild: disable 'maybe-uninitialized' warning
   for CONFIG_PROFILE_ALL_BRANCHES") turned off this option for
   CONFIG_PROFILE_ALL_BRANCHES

 - commit a76bcf557ef4 ("Kbuild: enable -Wmaybe-uninitialized warning
   for "make W=1"") turned off this option for GCC < 4.9
   Arnd provided more explanation in https://lkml.org/lkml/2017/3/14/903

I think this looks better by shifting the logic from Makefile to Kconfig.

Link: https://github.com/ClangBuiltLinux/linux/issues/350
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Reviewed-by: Nathan Chancellor <natechancellor@gmail.com>
Tested-by: Nick Desaulniers <ndesaulniers@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/Makefile b/Makefile
index 2a92330..36b03a4 100644 (file)
--- a/Makefile
+++ b/Makefile
@@ -658,17 +658,14 @@ KBUILD_CFLAGS     += $(call cc-option,-fdata-sections,)
 endif
 
 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
-KBUILD_CFLAGS  += -Os $(call cc-disable-warning,maybe-uninitialized,)
-else
-ifdef CONFIG_PROFILE_ALL_BRANCHES
-KBUILD_CFLAGS  += -O2 $(call cc-disable-warning,maybe-uninitialized,)
+KBUILD_CFLAGS   += -Os
 else
 KBUILD_CFLAGS   += -O2
 endif
-endif
 
-KBUILD_CFLAGS += $(call cc-ifversion, -lt, 0409, \
-                       $(call cc-disable-warning,maybe-uninitialized,))
+ifdef CONFIG_CC_DISABLE_WARN_MAYBE_UNINITIALIZED
+KBUILD_CFLAGS   += -Wno-maybe-uninitialized
+endif
 
 # Tell gcc to never replace conditional load with a non-conditional one
 KBUILD_CFLAGS  += $(call cc-option,--param=allow-store-data-races=0)

diff --git a/init/Kconfig b/init/Kconfig
index b331fee..63fb2da 100644 (file)
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -16,6 +16,22 @@ config DEFCONFIG_LIST
        default "$ARCH_DEFCONFIG"
        default "arch/$ARCH/defconfig"
 
+config CC_HAS_WARN_MAYBE_UNINITIALIZED
+       def_bool $(cc-option,-Wmaybe-uninitialized)
+       help
+         GCC >= 4.7 supports this option.
+
+config CC_DISABLE_WARN_MAYBE_UNINITIALIZED
+       bool
+       depends on CC_HAS_WARN_MAYBE_UNINITIALIZED
+       default CC_IS_GCC && GCC_VERSION < 40900  # unreliable for GCC < 4.9
+       help
+         GCC's -Wmaybe-uninitialized is not reliable by definition.
+         Lots of false positive warnings are produced in some cases.
+
+         If this option is enabled, -Wno-maybe-uninitialzed is passed
+         to the compiler to suppress maybe-uninitialized warnings.
+
 config CONSTRUCTORS
        bool
        depends on !UML
@@ -1333,6 +1349,7 @@ config CC_OPTIMIZE_FOR_PERFORMANCE
 
 config CC_OPTIMIZE_FOR_SIZE
        bool "Optimize for size"
+       imply CC_DISABLE_WARN_MAYBE_UNINITIALIZED  # avoid false positives
        help
          Enabling this option will pass "-Os" instead of "-O2" to
          your compiler resulting in a smaller kernel.

diff --git a/kernel/trace/Kconfig b/kernel/trace/Kconfig
index 2a96b06..6254fa6 100644 (file)
--- a/kernel/trace/Kconfig
+++ b/kernel/trace/Kconfig
@@ -342,6 +342,7 @@ config PROFILE_ANNOTATED_BRANCHES
 config PROFILE_ALL_BRANCHES
        bool "Profile all if conditionals"
        select TRACE_BRANCH_PROFILING
+       imply CC_DISABLE_WARN_MAYBE_UNINITIALIZED  # avoid false positives
        help
          This tracer profiles all branch conditions. Every if ()
          taken in the kernel is recorded whether it hit or miss.