Messages in this thread | | | Subject | Re: linux-next: Tree for Aug 20 (Wno-alloc-size-larger-than) | From | Randy Dunlap <> | Date | Sat, 21 Aug 2021 12:09:48 -0700 |
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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
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