From 88731c8f3636b133e27df88febcd7cd2fdece0a7 Mon Sep 17 00:00:00 2001 From: Vasily Gorbik Date: Thu, 29 Jul 2021 15:29:19 +0200 Subject: 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 Fixes: 7b034d9c1b08 ("s390/boot: add zstd support") Signed-off-by: Vasily Gorbik 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 --- arch/s390/boot/compressed/clz_ctz.c | 2 ++ 1 file changed, 2 insertions(+) create mode 100644 arch/s390/boot/compressed/clz_ctz.c (limited to 'arch/s390/boot/compressed/clz_ctz.c') 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" -- cgit v1.2.3-59-g8ed1b