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Message-ID: <20230622143538.GA1138962@dev-arch.thelio-3990X>
Date: Thu, 22 Jun 2023 14:35:38 +0000
From: Nathan Chancellor <nathan@...nel.org>
To: Heiko Carstens <hca@...ux.ibm.com>
Cc: Vasily Gorbik <gor@...ux.ibm.com>,
Alexander Gordeev <agordeev@...ux.ibm.com>,
Christian Borntraeger <borntraeger@...ux.ibm.com>,
Sven Schnelle <svens@...ux.ibm.com>,
Ulrich Weigand <Ulrich.Weigand@...ibm.com>,
linux-s390@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] s390/decompresser: fix misaligned symbol build error
On Thu, Jun 22, 2023 at 02:55:08PM +0200, Heiko Carstens wrote:
> Nathan Chancellor reported a kernel build error on Fedora 39:
>
> $ clang --version | head -1
> clang version 16.0.5 (Fedora 16.0.5-1.fc39)
>
> $ s390x-linux-gnu-ld --version | head -1
> GNU ld version 2.40-1.fc39
>
> $ make -skj"$(nproc)" ARCH=s390 CC=clang CROSS_COMPILE=s390x-linux-gnu- olddefconfig all
> s390x-linux-gnu-ld: arch/s390/boot/startup.o(.text+0x5b4): misaligned symbol `_decompressor_end' (0x35b0f) for relocation R_390_PC32DBL
> make[3]: *** [.../arch/s390/boot/Makefile:78: arch/s390/boot/vmlinux] Error 1
>
> It turned out that the problem with misaligned symbols on s390 was fixed
> with commit 80ddf5ce1c92 ("s390: always build relocatable kernel") for the
> kernel image, but did not take into account that the decompressor uses its
> own set of CFLAGS, which come without -fPIE.
>
> Add the -fPIE flag also to the decompresser CFLAGS to fix this.
>
I think this should also have:
Reported-by: CKI <cki-project@...hat.com>
Link: https://lore.kernel.org/32935.123062114500601371@us-mta-9.us.mimecast.lan/
I technically just forwarded the report and did a little extra testing.
> Reported-by: Nathan Chancellor <nathan@...nel.org>
> Suggested-by: Ulrich Weigand <Ulrich.Weigand@...ibm.com>
> Link: https://github.com/ClangBuiltLinux/linux/issues/1747
> Signed-off-by: Heiko Carstens <hca@...ux.ibm.com>
Thanks for the quick patch, this fixes the error and I did a simple boot
test in QEMU with the resulting kernel, which showed no issues.
Tested-by: Nathan Chancellor <nathan@...nel.org>
> ---
> arch/s390/Makefile | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/arch/s390/Makefile b/arch/s390/Makefile
> index ed646c583e4f..5ed242897b0d 100644
> --- a/arch/s390/Makefile
> +++ b/arch/s390/Makefile
> @@ -27,6 +27,7 @@ KBUILD_CFLAGS_DECOMPRESSOR += -fno-delete-null-pointer-checks -msoft-float -mbac
> KBUILD_CFLAGS_DECOMPRESSOR += -fno-asynchronous-unwind-tables
> KBUILD_CFLAGS_DECOMPRESSOR += -ffreestanding
> KBUILD_CFLAGS_DECOMPRESSOR += -fno-stack-protector
> +KBUILD_CFLAGS_DECOMPRESSOR += -fPIE
> KBUILD_CFLAGS_DECOMPRESSOR += $(call cc-disable-warning, address-of-packed-member)
> KBUILD_CFLAGS_DECOMPRESSOR += $(if $(CONFIG_DEBUG_INFO),-g)
> KBUILD_CFLAGS_DECOMPRESSOR += $(if $(CONFIG_DEBUG_INFO_DWARF4), $(call cc-option, -gdwarf-4,))
> --
> 2.39.2
>
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