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authorLinus Torvalds <torvalds@linux-foundation.org>2020-05-09 23:52:44 +0200
committerLinus Torvalds <torvalds@linux-foundation.org>2020-05-09 23:52:44 +0200
commit44720996e2d79e47d508b0abe99b931a726a3197 (patch)
tree731517d0e160daa835abc1735d0e9fc31cd2b1fe /Makefile
parentgcc-10: disable 'zero-length-bounds' warning for now (diff)
downloadlinux-44720996e2d79e47d508b0abe99b931a726a3197.tar.xz
linux-44720996e2d79e47d508b0abe99b931a726a3197.zip
gcc-10: disable 'array-bounds' warning for now
This is another fine warning, related to the 'zero-length-bounds' one, but hitting the same historical code in the kernel. Because C didn't historically support flexible array members, we have code that instead uses a one-sized array, the same way we have cases of zero-sized arrays. The one-sized arrays come from either not wanting to use the gcc zero-sized array extension, or from a slight convenience-feature, where particularly for strings, the size of the structure now includes the allocation for the final NUL character. So with a "char name[1];" at the end of a structure, you can do things like v = my_malloc(sizeof(struct vendor) + strlen(name)); and avoid the "+1" for the terminator. Yes, the modern way to do that is with a flexible array, and using 'offsetof()' instead of 'sizeof()', and adding the "+1" by hand. That also technically gets the size "more correct" in that it avoids any alignment (and thus padding) issues, but this is another long-term cleanup thing that will not happen for 5.7. So disable the warning for now, even though it's potentially quite useful. Having a slew of warnings that then hide more urgent new issues is not an improvement. Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'Makefile')
-rw-r--r--Makefile1
1 files changed, 1 insertions, 0 deletions
diff --git a/Makefile b/Makefile
index 68a781326dd7..b4c88f0eb6fe 100644
--- a/Makefile
+++ b/Makefile
@@ -879,6 +879,7 @@ KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)
# We'll want to enable this eventually, but it's not going away for 5.7 at least
KBUILD_CFLAGS += $(call cc-disable-warning, zero-length-bounds)
+KBUILD_CFLAGS += $(call cc-disable-warning, array-bounds)
# Enabled with W=2, disabled by default as noisy
KBUILD_CFLAGS += $(call cc-disable-warning, maybe-uninitialized)