linux-kernel - Clang: powerpc: kvm/book3s_hv_nested.c:264:6: error: stack frame size of 2480 bytes in function 'kvmhv_enter_nested

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Date:   Fri, 19 Mar 2021 12:50:42 +0530
From:   Naresh Kamboju <naresh.kamboju@...aro.org>
To:     clang-built-linux <clang-built-linux@...glegroups.com>,
        open list <linux-kernel@...r.kernel.org>,
        lkft-triage@...ts.linaro.org,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        kvm-ppc@...r.kernel.org
Cc:     Michael Ellerman <mpe@...erman.id.au>,
        Paul Mackerras <paulus@...abs.org>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Arnd Bergmann <arnd@...db.de>,
        Nathan Chancellor <nathan@...nel.org>,
        Nathan Chancellor <natechancellor@...il.com>,
        Nick Desaulniers <ndesaulniers@...gle.com>
Subject: Clang: powerpc: kvm/book3s_hv_nested.c:264:6: error: stack frame size
 of 2480 bytes in function 'kvmhv_enter_nested_guest'

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@...aro.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@...aro.org>

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

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