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Code

MIPS: Fix inline asm input/output type mismatch in checksum.h used with Clang

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Fix the following build error when make M=samples/bpf used with Clang:

  CLANG-bpf  samples/bpf/sockex2_kern.o
In file included from samples/bpf/sockex2_kern.c:7:
In file included from ./include/uapi/linux/if_tunnel.h:7:
In file included from ./include/linux/ip.h:16:
In file included from ./include/linux/skbuff.h:28:
In file included from ./include/net/checksum.h:22:
./arch/mips/include/asm/checksum.h:161:9: error: unsupported inline asm: input with type 'unsigned long' matching output with type '__wsum' (aka 'unsigned int')
        : "0" ((__force unsigned long)daddr),
               ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
1 error generated.

This is a known issue on MIPS [1], the changed code can be compiled
successfully by both GCC and Clang.

[1] https://lore.kernel.org/linux-mips/CAG_fn=W0JHf8QyUX==+rQMp8PoULHrsQCa9Htffws31ga8k-iw@mail.gmail.com/

Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
This commit is contained in:
Tiezhu Yang 2021-01-27 12:41:47 +08:00 committed by Thomas Bogendoerfer
parent e6a52b8f0f
commit 198688edbf
1 changed files with 4 additions and 2 deletions
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6
arch/mips/include/asm/checksum.h
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@ -130,6 +130,8 @@ static inline __wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr,
__u32 len, __u8 proto,
__wsum sum)
{
unsigned long tmp = (__force unsigned long)sum;
__asm__(
" .set push # csum_tcpudp_nofold\n"
" .set noat \n"
@ -157,7 +159,7 @@ static inline __wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr,
" addu %0, $1 \n"
#endif
" .set pop"
: "=r" (sum)
: "=r" (tmp)
: "0" ((__force unsigned long)daddr),
"r" ((__force unsigned long)saddr),
#ifdef __MIPSEL__
@ -167,7 +169,7 @@ static inline __wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr,
#endif
"r" ((__force unsigned long)sum));
return sum;
return (__force __wsum)tmp;
}
#define csum_tcpudp_nofold csum_tcpudp_nofold