gcc: disable -Warray-bounds for gcc-11 too

We had already disabled this warning for gcc-12 due to bugs in the value
range analysis, but it turns out we end up having some similar problems
with gcc-11.3 too, so let's disable it there too.

Older gcc versions end up being increasingly less relevant, and
hopefully clang and newer version of gcc (ie gcc-13) end up working
reliably enough that we still get the build coverage even when we
disable this for some versions.

Link: https://lore.kernel.org/all/20221227002941.GA2691687@roeck-us.net/
Link: https://lore.kernel.org/all/D8BDBF66-E44C-45D4-9758-BAAA4F0C1998@kernel.org/
Cc: Kees Cook <kees@kernel.org>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/init/Kconfig b/init/Kconfig
index 7e5c3ddc341de319115e47399beb53e9b9960363..0958846b005e1591c5be6d0e4428e7d2ebd9534c 100644 (file)
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -894,13 +894,17 @@ config CC_IMPLICIT_FALLTHROUGH
        default "-Wimplicit-fallthrough=5" if CC_IS_GCC && $(cc-option,-Wimplicit-fallthrough=5)
        default "-Wimplicit-fallthrough" if CC_IS_CLANG && $(cc-option,-Wunreachable-code-fallthrough)
 
-# Currently, disable gcc-12 array-bounds globally.
+# Currently, disable gcc-11,12 array-bounds globally.
 # We may want to target only particular configurations some day.
+config GCC11_NO_ARRAY_BOUNDS
+       def_bool y
+
 config GCC12_NO_ARRAY_BOUNDS
        def_bool y
 
 config CC_NO_ARRAY_BOUNDS
        bool
+       default y if CC_IS_GCC && GCC_VERSION >= 110000 && GCC_VERSION < 120000 && GCC11_NO_ARRAY_BOUNDS
        default y if CC_IS_GCC && GCC_VERSION >= 120000 && GCC_VERSION < 130000 && GCC12_NO_ARRAY_BOUNDS
 
 #