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authorVasily Gorbik <gor@linux.ibm.com>2021-07-29 15:29:19 +0200
committerHeiko Carstens <hca@linux.ibm.com>2021-07-30 17:08:22 +0200
commit88731c8f3636b133e27df88febcd7cd2fdece0a7 (patch)
tree120fb03e0fc537ef96a9745e6f49da6df5501557 /arch
parent7561c14d8a4d1a24a40b1839d927d488e2d6345a (diff)
s390/boot: fix zstd build for -march=z900
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> Link: https://lore.kernel.org/r/patch-1.thread-f0f589.git-f0f58936888f.your-ad-here.call-01627564869-ext-2765@work.hours Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Diffstat (limited to 'arch')
-rw-r--r--arch/s390/boot/compressed/Makefile1
-rw-r--r--arch/s390/boot/compressed/clz_ctz.c2
2 files changed, 3 insertions, 0 deletions
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"