commit 3e00f5802fab ("init/Kconfig: lower GCC version check for -Warray-bounds")
lowers GCC version check for -Warray-bounds, but I continue to see false positives
from -Warray-bounds in GCC 9.4.
This happens after
commit b44759705f7d ("bitmap: make bitmap_{get,set}_value8() use bitmap_{read,write}()")
During the rcuturture test in Ubuntu 20.04 GCC 9.4.0 x86_64, the compiling of
drivers/gpio/gpio-pca953x.c issues following warning:
```
CC drivers/gpio/gpio-pca953x.o
In file included from drivers/gpio/gpio-pca953x.c:12:
drivers/gpio/gpio-pca953x.c: In function ‘pca953x_probe’:
./include/linux/bitmap.h:799:17: error: array subscript [1, 1024] is outside array bounds of ‘long unsigned int[1]’ [-Werror=array-bounds]
799 | map[index + 1] &= BITMAP_FIRST_WORD_MASK(start + nbits);
| ^~
In file included from ./include/linux/atomic.h:5,
from drivers/gpio/gpio-pca953x.c:11:
drivers/gpio/gpio-pca953x.c:1015:17: note: while referencing ‘val’
1015 | DECLARE_BITMAP(val, MAX_LINE);
| ^~~
./include/linux/types.h:11:16: note: in definition of macro ‘DECLARE_BITMAP’
11 | unsigned long name[BITS_TO_LONGS(bits)]
| ^~~~
In file included from drivers/gpio/gpio-pca953x.c:12:
./include/linux/bitmap.h:800:17: error: array subscript [1, 1024] is outside array bounds of ‘long unsigned int[1]’ [-Werror=array-bounds]
800 | map[index + 1] |= (value >> space);
| ~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~
In file included from ./include/linux/atomic.h:5,
from drivers/gpio/gpio-pca953x.c:11:
drivers/gpio/gpio-pca953x.c:1015:17: note: while referencing ‘val’
1015 | DECLARE_BITMAP(val, MAX_LINE);
| ^~~
./include/linux/types.h:11:16: note: in definition of macro ‘DECLARE_BITMAP’
11 | unsigned long name[BITS_TO_LONGS(bits)]
```
Disable gcc-9+ array-bounds avoid above warning.
Signed-off-by: Zhouyi Zhou <zhouzhouyi@xxxxxxxxx>
---
init/Kconfig | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/init/Kconfig b/init/Kconfig
index 72404c1f2157..27ce2ded95b6 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -876,14 +876,14 @@ 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-10+ array-bounds globally.
+# Currently, disable gcc-9+ array-bounds globally.
# It's still broken in gcc-13, so no upper bound yet.
-config GCC10_NO_ARRAY_BOUNDS
+config GCC9_NO_ARRAY_BOUNDS
def_bool y
config CC_NO_ARRAY_BOUNDS
bool
- default y if CC_IS_GCC && GCC_VERSION >= 100000 && GCC10_NO_ARRAY_BOUNDS
+ default y if CC_IS_GCC && GCC_VERSION >= 90000 && GCC9_NO_ARRAY_BOUNDS
# Currently, disable -Wstringop-overflow for GCC globally.
config GCC_NO_STRINGOP_OVERFLOW
--
2.25.1
