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* Clang: powerpc: kvm/book3s_hv_nested.c:264:6: error: stack frame size of 2480 bytes in function 'kvmhv_enter_nested_guest'
@ 2021-03-19  7:20 Naresh Kamboju
  2021-03-19 17:01 ` Nathan Chancellor
  0 siblings, 1 reply; 2+ messages in thread
From: Naresh Kamboju @ 2021-03-19  7:20 UTC (permalink / raw)
  To: clang-built-linux, open list, lkft-triage, linuxppc-dev, kvm-ppc
  Cc: Nathan Chancellor, Arnd Bergmann, Nick Desaulniers, Nathan Chancellor

Linux mainline master build breaks for powerpc defconfig.
There are multiple errors / warnings with clang-12 and clang-11 and 10.
 - powerpc (defconfig) with clang-12
 - powerpc (defconfig) with clang-11
 - powerpc (defconfig) with clang-10

The following build errors / warnings triggered with clang-12.
make --silent --keep-going --jobs=8
O=/home/tuxbuild/.cache/tuxmake/builds/1/tmp LLVM=1 ARCH=powerpc
CROSS_COMPILE=powerpc64le-linux-gnu- 'HOSTCC=sccache clang'
'CC=sccache clang'
/builds/linux/arch/powerpc/kvm/book3s_hv_nested.c:264:6: error: stack
frame size of 2480 bytes in function 'kvmhv_enter_nested_guest'
[-Werror,-Wframe-larger-than=]
long kvmhv_enter_nested_guest(struct kvm_vcpu *vcpu)
     ^
1 error generated.
make[3]: *** [/builds/linux/scripts/Makefile.build:271:
arch/powerpc/kvm/book3s_hv_nested.o] Error 1

Reported-by: Naresh Kamboju <naresh.kamboju@linaro.org>

The following build errors / warnings triggered with clang-10 and clang-11.
 - powerpc (defconfig) with clang-11
 - powerpc (defconfig) with clang-10
make --silent --keep-going --jobs=8
O=/home/tuxbuild/.cache/tuxmake/builds/1/tmp LLVM=1 ARCH=powerpc
CROSS_COMPILE=powerpc64le-linux-gnu- 'HOSTCC=sccache clang'
'CC=sccache clang'

/usr/bin/powerpc64le-linux-gnu-ld:
arch/powerpc/kernel/vdso32/sigtramp.o: compiled for a little endian
system and target is big endian
/usr/bin/powerpc64le-linux-gnu-ld: failed to merge target specific
data of file arch/powerpc/kernel/vdso32/sigtramp.o
/usr/bin/powerpc64le-linux-gnu-ld:
arch/powerpc/kernel/vdso32/gettimeofday.o: compiled for a little
endian system and target is big endian
/usr/bin/powerpc64le-linux-gnu-ld: failed to merge target specific
data of file arch/powerpc/kernel/vdso32/gettimeofday.o
/usr/bin/powerpc64le-linux-gnu-ld:
arch/powerpc/kernel/vdso32/datapage.o: compiled for a little endian
system and target is big endian
/usr/bin/powerpc64le-linux-gnu-ld: failed to merge target specific
data of file arch/powerpc/kernel/vdso32/datapage.o
/usr/bin/powerpc64le-linux-gnu-ld:
arch/powerpc/kernel/vdso32/cacheflush.o: compiled for a little endian
system and target is big endian
/usr/bin/powerpc64le-linux-gnu-ld: failed to merge target specific
data of file arch/powerpc/kernel/vdso32/cacheflush.o
/usr/bin/powerpc64le-linux-gnu-ld: arch/powerpc/kernel/vdso32/note.o:
compiled for a little endian system and target is big endian
/usr/bin/powerpc64le-linux-gnu-ld: failed to merge target specific
data of file arch/powerpc/kernel/vdso32/note.o
/usr/bin/powerpc64le-linux-gnu-ld:
arch/powerpc/kernel/vdso32/getcpu.o: compiled for a little endian
system and target is big endian
/usr/bin/powerpc64le-linux-gnu-ld: failed to merge target specific
data of file arch/powerpc/kernel/vdso32/getcpu.o
/usr/bin/powerpc64le-linux-gnu-ld:
arch/powerpc/kernel/vdso32/vgettimeofday.o: compiled for a little
endian system and target is big endian
/usr/bin/powerpc64le-linux-gnu-ld: failed to merge target specific
data of file arch/powerpc/kernel/vdso32/vgettimeofday.o
clang: error: unable to execute command: Segmentation fault (core dumped)
clang: error: linker command failed due to signal (use -v to see invocation)
make[2]: *** [/builds/linux/arch/powerpc/kernel/vdso32/Makefile:51:
arch/powerpc/kernel/vdso32/vdso32.so.dbg] Error 254
make[2]: Target 'include/generated/vdso32-offsets.h' not remade
because of errors.

Reported-by: Naresh Kamboju <naresh.kamboju@linaro.org>

build link,
https://gitlab.com/Linaro/lkft/mirrors/torvalds/linux-mainline/-/jobs/1110841371#L59

--
Linaro LKFT
https://lkft.linaro.org

^ permalink raw reply	[flat|nested] 2+ messages in thread
* Re: Clang: powerpc: kvm/book3s_hv_nested.c:264:6: error: stack frame size of 2480 bytes in function 'kvmhv_enter_nested_guest'
  2021-03-19  7:20 Clang: powerpc: kvm/book3s_hv_nested.c:264:6: error: stack frame size of 2480 bytes in function 'kvmhv_enter_nested_guest' Naresh Kamboju
@ 2021-03-19 17:01 ` Nathan Chancellor
  0 siblings, 0 replies; 2+ messages in thread
From: Nathan Chancellor @ 2021-03-19 17:01 UTC (permalink / raw)
  To: Naresh Kamboju
  Cc: Arnd Bergmann, Nick Desaulniers, open list, kvm-ppc,
	clang-built-linux, lkft-triage, Nathan Chancellor, linuxppc-dev

Hi Naresh,

Thank you for the testing and report.

On Fri, Mar 19, 2021 at 12:50:42PM +0530, Naresh Kamboju wrote:
> Linux mainline master build breaks for powerpc defconfig.
> There are multiple errors / warnings with clang-12 and clang-11 and 10.
>  - powerpc (defconfig) with clang-12
>  - powerpc (defconfig) with clang-11
>  - powerpc (defconfig) with clang-10
> 
> The following build errors / warnings triggered with clang-12.
> make --silent --keep-going --jobs=8
> O=/home/tuxbuild/.cache/tuxmake/builds/1/tmp LLVM=1 ARCH=powerpc
> CROSS_COMPILE=powerpc64le-linux-gnu- 'HOSTCC=sccache clang'
> 'CC=sccache clang'
> /builds/linux/arch/powerpc/kvm/book3s_hv_nested.c:264:6: error: stack
> frame size of 2480 bytes in function 'kvmhv_enter_nested_guest'
> [-Werror,-Wframe-larger-than=]
> long kvmhv_enter_nested_guest(struct kvm_vcpu *vcpu)
>      ^
> 1 error generated.
> make[3]: *** [/builds/linux/scripts/Makefile.build:271:
> arch/powerpc/kvm/book3s_hv_nested.o] Error 1
> 
> Reported-by: Naresh Kamboju <naresh.kamboju@linaro.org>

Yes, unfortunately, this is a clang-12 regression that was exposed by
commit 97e4910232fa ("linux/compiler-clang.h: define HAVE_BUILTIN_BSWAP*")
and it is being tracked on both our GitHub issue tracker and LLVM's
bugzilla:

https://github.com/ClangBuiltLinux/linux/issues/1292
https://bugs.llvm.org/show_bug.cgi?id=49610

Once it has been sorted out, we can potentially work around that by just
raising the limit for that particular file (not sure what the PowerPC
maintainers will want to do).

> The following build errors / warnings triggered with clang-10 and clang-11.
>  - powerpc (defconfig) with clang-11
>  - powerpc (defconfig) with clang-10
> make --silent --keep-going --jobs=8
> O=/home/tuxbuild/.cache/tuxmake/builds/1/tmp LLVM=1 ARCH=powerpc
> CROSS_COMPILE=powerpc64le-linux-gnu- 'HOSTCC=sccache clang'
> 'CC=sccache clang'
> 
> /usr/bin/powerpc64le-linux-gnu-ld:
> arch/powerpc/kernel/vdso32/sigtramp.o: compiled for a little endian
> system and target is big endian
> /usr/bin/powerpc64le-linux-gnu-ld: failed to merge target specific
> data of file arch/powerpc/kernel/vdso32/sigtramp.o
> /usr/bin/powerpc64le-linux-gnu-ld:
> arch/powerpc/kernel/vdso32/gettimeofday.o: compiled for a little
> endian system and target is big endian
> /usr/bin/powerpc64le-linux-gnu-ld: failed to merge target specific
> data of file arch/powerpc/kernel/vdso32/gettimeofday.o
> /usr/bin/powerpc64le-linux-gnu-ld:
> arch/powerpc/kernel/vdso32/datapage.o: compiled for a little endian
> system and target is big endian
> /usr/bin/powerpc64le-linux-gnu-ld: failed to merge target specific
> data of file arch/powerpc/kernel/vdso32/datapage.o
> /usr/bin/powerpc64le-linux-gnu-ld:
> arch/powerpc/kernel/vdso32/cacheflush.o: compiled for a little endian
> system and target is big endian
> /usr/bin/powerpc64le-linux-gnu-ld: failed to merge target specific
> data of file arch/powerpc/kernel/vdso32/cacheflush.o
> /usr/bin/powerpc64le-linux-gnu-ld: arch/powerpc/kernel/vdso32/note.o:
> compiled for a little endian system and target is big endian
> /usr/bin/powerpc64le-linux-gnu-ld: failed to merge target specific
> data of file arch/powerpc/kernel/vdso32/note.o
> /usr/bin/powerpc64le-linux-gnu-ld:
> arch/powerpc/kernel/vdso32/getcpu.o: compiled for a little endian
> system and target is big endian
> /usr/bin/powerpc64le-linux-gnu-ld: failed to merge target specific
> data of file arch/powerpc/kernel/vdso32/getcpu.o
> /usr/bin/powerpc64le-linux-gnu-ld:
> arch/powerpc/kernel/vdso32/vgettimeofday.o: compiled for a little
> endian system and target is big endian
> /usr/bin/powerpc64le-linux-gnu-ld: failed to merge target specific
> data of file arch/powerpc/kernel/vdso32/vgettimeofday.o
> clang: error: unable to execute command: Segmentation fault (core dumped)
> clang: error: linker command failed due to signal (use -v to see invocation)
> make[2]: *** [/builds/linux/arch/powerpc/kernel/vdso32/Makefile:51:
> arch/powerpc/kernel/vdso32/vdso32.so.dbg] Error 254
> make[2]: Target 'include/generated/vdso32-offsets.h' not remade
> because of errors.
> 
> Reported-by: Naresh Kamboju <naresh.kamboju@linaro.org>
> 
> build link,
> https://gitlab.com/Linaro/lkft/mirrors/torvalds/linux-mainline/-/jobs/1110841371#L59
> 

This is a deficiency in clang that has been fixed in clang-12:

https://github.com/llvm/llvm-project/commit/0a23fbd28c7509f2f980946091e6055bf27164d2

but tuxmake can resolve it by using a more appropriate CROSS_COMPILE
variable for powerpc64 big-endian (powerpc64-linux-gnu-):

https://gitlab.com/Linaro/tuxmake/-/issues/108

Cheers,
Nathan

^ permalink raw reply	[flat|nested] 2+ messages in thread
end of thread, other threads:[~2021-03-19 17:02 UTC | newest]

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2021-03-19  7:20 Clang: powerpc: kvm/book3s_hv_nested.c:264:6: error: stack frame size of 2480 bytes in function 'kvmhv_enter_nested_guest' Naresh Kamboju
2021-03-19 17:01 ` Nathan Chancellor

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