On 8/20/21 10:48 PM, Kees Cook wrote:
On Fri, Aug 20, 2021 at 02:54:05PM -0700, Randy Dunlap wrote:
On 8/20/21 2:26 AM, Stephen Rothwell wrote:
Hi all,
Changes since 20210819:
Both linux-next and mmotm have many of these warnings when using
gcc (SUSE Linux) 7.5.0:
cc1: warning: unrecognized command line option '-Wno-alloc-size-larger-than'
Ew. Thanks for letting me know. I thought I'd verified this existed in
gcc going back to 4.9, but it looks like I did something wrong in that
test.
I think this should fix it:
diff --git a/Makefile b/Makefile
index b0fafc41b686..e33ffa05899e 100644
--- a/Makefile
+++ b/Makefile
@@ -1097,7 +1097,7 @@ endif
ifdef CONFIG_CC_IS_GCC
# The allocators already balk at large sizes, so silence the compiler
# warnings for bounds checks involving those possible values.
-KBUILD_CFLAGS += -Wno-alloc-size-larger-than
+KBUILD_CFLAGS += $(call cc-option, -Wno-alloc-size-larger-than)
endif
# disable invalid "can't wrap" optimizations for signed / pointers
Well. That didn't help. This is very weird.
This -Wno... option works (is accepted, no warning) on most files
that are being built, but a few files report an error with it:
../drivers/gpu/drm/radeon/radeon_object.c: At top level:
cc1: warning: unrecognized command line option '-Wno-alloc-size-larger-than'
../drivers/gpu/drm/amd/amdgpu/amdgpu_object.c: At top level:
cc1: warning: unrecognized command line option '-Wno-alloc-size-larger-than'
../drivers/hwmon/dell-smm-hwmon.c: At top level:
cc1: warning: unrecognized command line option '-Wno-alloc-size-larger-than'
CC arch/x86/kernel/cpu/proc.o
cc1: warning: unrecognized command line option '-Wno-alloc-size-larger-than'
../arch/x86/kvm/mmu/mmu.c: At top level:
cc1: error: unrecognized command line option '-Wno-alloc-size-larger-than' [-Werror]
../drivers/gpu/drm/amd/amdgpu/../amdkfd/kfd_chardev.c: At top level:
cc1: warning: unrecognized command line option '-Wno-alloc-size-larger-than'
../kernel/trace/trace_osnoise.c: At top level:
cc1: warning: unrecognized command line option '-Wno-alloc-size-larger-than'
CC kernel/dma/mapping.o
cc1: warning: unrecognized command line option '-Wno-alloc-size-larger-than'
It seems like it might be related to some .config option.
I did a couple of partial builds with V=1 but that info didn't help me any.
If I am the only person seeing (reporting) this build warning, it could
just be (another) SUSE GCC-ism. (had one just last week with -Wmain and
kernel/trace/trace_osnoise.c)
--
~Randy
