From: Vasily Gorbik <gor@linux.ibm.com> To: Heiko Carstens <hca@linux.ibm.com> Cc: Dimitri John Ledkov <dimitri.ledkov@canonical.com>, kbuild-all@lists.01.org, linux-kernel@vger.kernel.org, kernel test robot <lkp@intel.com> Subject: [PATCH] s390/boot: fix zstd build for -march=z900 Date: Thu, 29 Jul 2021 15:29:19 +0200 [thread overview] Message-ID: <patch-1.thread-f0f589.git-f0f58936888f.your-ad-here.call-01627564869-ext-2765@work.hours> (raw) In-Reply-To: <cover.thread-f0f589.your-ad-here.call-01627564869-ext-2765@work.hours> zstd decompression uses __builtin_clz() which fails back to __clzdi2() when the kernel is built for older hardware like z900. This leads to build failures like the following: s390x-11.1.0-ld: /devel/src/kernel/arch/s390/boot/compressed/../../../../lib/zstd/bitstream.h:148: undefined reference to `__clzdi2' Fix that by optionally including lib/clz_ctz.c into the decompressor. Reported-by: kernel test robot <lkp@intel.com> Fixes: 7b034d9c1b08 ("s390/boot: add zstd support") Signed-off-by: Vasily Gorbik <gor@linux.ibm.com> --- arch/s390/boot/compressed/Makefile | 1 + arch/s390/boot/compressed/clz_ctz.c | 2 ++ 2 files changed, 3 insertions(+) create mode 100644 arch/s390/boot/compressed/clz_ctz.c diff --git a/arch/s390/boot/compressed/Makefile b/arch/s390/boot/compressed/Makefile index 660c799d875d..e30d3fdbbc78 100644 --- a/arch/s390/boot/compressed/Makefile +++ b/arch/s390/boot/compressed/Makefile @@ -11,6 +11,7 @@ UBSAN_SANITIZE := n KASAN_SANITIZE := n obj-y := $(if $(CONFIG_KERNEL_UNCOMPRESSED),,decompressor.o) info.o +obj-$(CONFIG_KERNEL_ZSTD) += clz_ctz.o obj-all := $(obj-y) piggy.o syms.o targets := vmlinux.lds vmlinux vmlinux.bin vmlinux.bin.gz vmlinux.bin.bz2 targets += vmlinux.bin.xz vmlinux.bin.lzma vmlinux.bin.lzo vmlinux.bin.lz4 diff --git a/arch/s390/boot/compressed/clz_ctz.c b/arch/s390/boot/compressed/clz_ctz.c new file mode 100644 index 000000000000..c3ebf248596b --- /dev/null +++ b/arch/s390/boot/compressed/clz_ctz.c @@ -0,0 +1,2 @@ +// SPDX-License-Identifier: GPL-2.0 +#include "../../../../lib/clz_ctz.c" -- 2.25.4
WARNING: multiple messages have this Message-ID (diff)
From: Vasily Gorbik <gor@linux.ibm.com> To: kbuild-all@lists.01.org Subject: [PATCH] s390/boot: fix zstd build for -march=z900 Date: Thu, 29 Jul 2021 15:29:19 +0200 [thread overview] Message-ID: <patch-1.thread-f0f589.git-f0f58936888f.your-ad-here.call-01627564869-ext-2765@work.hours> (raw) In-Reply-To: <cover.thread-f0f589.your-ad-here.call-01627564869-ext-2765@work.hours> [-- Attachment #1: Type: text/plain, Size: 1609 bytes --] zstd decompression uses __builtin_clz() which fails back to __clzdi2() when the kernel is built for older hardware like z900. This leads to build failures like the following: s390x-11.1.0-ld: /devel/src/kernel/arch/s390/boot/compressed/../../../../lib/zstd/bitstream.h:148: undefined reference to `__clzdi2' Fix that by optionally including lib/clz_ctz.c into the decompressor. Reported-by: kernel test robot <lkp@intel.com> Fixes: 7b034d9c1b08 ("s390/boot: add zstd support") Signed-off-by: Vasily Gorbik <gor@linux.ibm.com> --- arch/s390/boot/compressed/Makefile | 1 + arch/s390/boot/compressed/clz_ctz.c | 2 ++ 2 files changed, 3 insertions(+) create mode 100644 arch/s390/boot/compressed/clz_ctz.c diff --git a/arch/s390/boot/compressed/Makefile b/arch/s390/boot/compressed/Makefile index 660c799d875d..e30d3fdbbc78 100644 --- a/arch/s390/boot/compressed/Makefile +++ b/arch/s390/boot/compressed/Makefile @@ -11,6 +11,7 @@ UBSAN_SANITIZE := n KASAN_SANITIZE := n obj-y := $(if $(CONFIG_KERNEL_UNCOMPRESSED),,decompressor.o) info.o +obj-$(CONFIG_KERNEL_ZSTD) += clz_ctz.o obj-all := $(obj-y) piggy.o syms.o targets := vmlinux.lds vmlinux vmlinux.bin vmlinux.bin.gz vmlinux.bin.bz2 targets += vmlinux.bin.xz vmlinux.bin.lzma vmlinux.bin.lzo vmlinux.bin.lz4 diff --git a/arch/s390/boot/compressed/clz_ctz.c b/arch/s390/boot/compressed/clz_ctz.c new file mode 100644 index 000000000000..c3ebf248596b --- /dev/null +++ b/arch/s390/boot/compressed/clz_ctz.c @@ -0,0 +1,2 @@ +// SPDX-License-Identifier: GPL-2.0 +#include "../../../../lib/clz_ctz.c" -- 2.25.4
next prev parent reply other threads:[~2021-07-29 13:30 UTC|newest] Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-07-27 17:27 decompressor.c:undefined reference to `__clzdi2' kernel test robot 2021-07-27 17:27 ` kernel test robot 2021-07-29 13:29 ` Vasily Gorbik 2021-07-29 13:29 ` Vasily Gorbik 2021-07-29 13:29 ` Vasily Gorbik [this message] 2021-07-29 13:29 ` [PATCH] s390/boot: fix zstd build for -march=z900 Vasily Gorbik 2021-07-29 14:42 ` Heiko Carstens 2021-07-29 14:42 ` Heiko Carstens
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