linux-kernel - [PATCH v2 1/4] MIPS: zboot: Fix the build with XZ compression on older GCC versions

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Date:	Sat, 23 Jan 2016 13:48:15 +0100
From:	Alban Bedel <albeu@...e.fr>
To:	linux-mips@...ux-mips.org
Cc:	Ralf Baechle <ralf@...ux-mips.org>,
	Andrew Bresticker <abrestic@...omium.org>,
	Alex Smith <alex.smith@...tec.com>,
	Wu Zhangjin <wuzhangjin@...il.com>,
	linux-kernel@...r.kernel.org, Alban Bedel <albeu@...e.fr>,
	stable@...r.kernel.org
Subject: [PATCH v2 1/4] MIPS: zboot: Fix the build with XZ compression on older GCC versions

Some older GCC version (at least 4.6) emits calls to __bswapsi2() when
building the XZ decompressor. The link of the compressed image then
fails with the following error:

arch/mips/boot/compressed/decompress.o: In function '__fswab32':
include/uapi/linux/swab.h:60: undefined reference to '__bswapsi2'

Add bswapsi.o to the link to fix the build with these versions.

Signed-off-by: Alban Bedel <albeu@...e.fr>
CC: stable@...r.kernel.org # v4.4
---
Changelog:
v2: * Added CC to stable as the patch hasn't been merged in 4.4
---
 arch/mips/boot/compressed/Makefile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/mips/boot/compressed/Makefile b/arch/mips/boot/compressed/Makefile
index d5bdee1..45f8abb 100644
--- a/arch/mips/boot/compressed/Makefile
+++ b/arch/mips/boot/compressed/Makefile
@@ -41,7 +41,7 @@ vmlinuzobjs-$(CONFIG_MIPS_ALCHEMY)		   += $(obj)/uart-alchemy.o
 endif
 
 ifdef CONFIG_KERNEL_XZ
-vmlinuzobjs-y += $(obj)/../../lib/ashldi3.o
+vmlinuzobjs-y += $(obj)/../../lib/ashldi3.o $(obj)/../../lib/bswapsi.o
 endif
 
 targets += vmlinux.bin
-- 
2.0.0