Stop the ad-hoc games with -Wno-maybe-initialized

We have some rather random rules about when we accept the
"maybe-initialized" warnings, and when we don't.

For example, we consider it unreliable for gcc versions < 4.9, but also
if -O3 is enabled, or if optimizing for size.  And then various kernel
config options disabled it, because they know that they trigger that
warning by confusing gcc sufficiently (ie PROFILE_ALL_BRANCHES).

And now gcc-10 seems to be introducing a lot of those warnings too, so
it falls under the same heading as 4.9 did.

At the same time, we have a very straightforward way to _enable_ that
warning when wanted: use "W=2" to enable more warnings.

So stop playing these ad-hoc games, and just disable that warning by
default, with the known and straight-forward "if you want to work on the
extra compiler warnings, use W=123".

Would it be great to have code that is always so obvious that it never
confuses the compiler whether a variable is used initialized or not?
Yes, it would.  In a perfect world, the compilers would be smarter, and
our source code would be simpler.

That's currently not the world we live in, though.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/Makefile b/Makefile
index 3512f7b..1e94f4f 100644 (file)
--- a/Makefile
+++ b/Makefile
@@ -729,10 +729,6 @@ else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 KBUILD_CFLAGS += -Os
 endif
 
-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)
 KBUILD_CFLAGS  += $(call cc-option,-fno-allow-store-data-races)
@@ -881,6 +877,9 @@ KBUILD_CFLAGS += -Wno-pointer-sign
 # disable stringop warnings in gcc 8+
 KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)
 
+# Enabled with W=2, disabled by default as noisy
+KBUILD_CFLAGS += $(call cc-disable-warning, maybe-uninitialized)
+
 # disable invalid "can't wrap" optimizations for signed / pointers
 KBUILD_CFLAGS  += $(call cc-option,-fno-strict-overflow)
 

diff --git a/init/Kconfig b/init/Kconfig
index 9e22ee8..9278a60 100644 (file)
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -39,22 +39,6 @@ config TOOLS_SUPPORT_RELR
 config CC_HAS_ASM_INLINE
        def_bool $(success,echo 'void foo(void) { asm inline (""); }' | $(CC) -x c - -c -o /dev/null)
 
-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
@@ -1257,14 +1241,12 @@ config CC_OPTIMIZE_FOR_PERFORMANCE
 config CC_OPTIMIZE_FOR_PERFORMANCE_O3
        bool "Optimize more for performance (-O3)"
        depends on ARC
-       imply CC_DISABLE_WARN_MAYBE_UNINITIALIZED  # avoid false positives
        help
          Choosing this option will pass "-O3" to your compiler to optimize
          the kernel yet more for performance.
 
 config CC_OPTIMIZE_FOR_SIZE
        bool "Optimize for size (-Os)"
-       imply CC_DISABLE_WARN_MAYBE_UNINITIALIZED  # avoid false positives
        help
          Choosing this option will pass "-Os" to your compiler resulting
          in a smaller kernel.

diff --git a/kernel/trace/Kconfig b/kernel/trace/Kconfig
index 402eef8..7436470 100644 (file)
--- a/kernel/trace/Kconfig
+++ b/kernel/trace/Kconfig
@@ -466,7 +466,6 @@ config PROFILE_ANNOTATED_BRANCHES
 config PROFILE_ALL_BRANCHES
        bool "Profile all if conditionals" if !FORTIFY_SOURCE
        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.