linux-kernel - arch/x86/include/asm/checksum_32.h:149:6: error: inline assembly requires more registers than available

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Date:   Sun, 4 Sep 2022 20:45:34 +0800
From:   kernel test robot <lkp@...el.com>
To:     Kees Cook <keescook@...omium.org>
Cc:     llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
        linux-kernel@...r.kernel.org, Marco Elver <elver@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linux Memory Management List <linux-mm@...ck.org>
Subject: arch/x86/include/asm/checksum_32.h:149:6: error: inline assembly
 requires more registers than available

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   7726d4c3e60bfe206738894267414a5f10510f1a
commit: 69d0db01e210e07fe915e5da91b54a867cda040f ubsan: remove CONFIG_UBSAN_OBJECT_SIZE
date:   8 months ago
config: i386-allyesconfig (https://download.01.org/0day-ci/archive/20220904/202209042007.sjb2ZKIv-lkp@intel.com/config)
compiler: clang version 14.0.6 (https://github.com/llvm/llvm-project f28c006a5895fc0e329fe15fead81e37457cb1d1)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=69d0db01e210e07fe915e5da91b54a867cda040f
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout 69d0db01e210e07fe915e5da91b54a867cda040f
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=i386 SHELL=/bin/bash

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@...el.com>

All errors (new ones prefixed by >>):

   In file included from net/netfilter/nf_synproxy_core.c:7:
   In file included from include/linux/skbuff.h:28:
   In file included from include/net/checksum.h:22:
   In file included from arch/x86/include/asm/checksum.h:6:
>> arch/x86/include/asm/checksum_32.h:149:6: error: inline assembly requires more registers than available
           asm("addl 0(%1), %0     ;\n"
               ^
   1 error generated.


vim +149 arch/x86/include/asm/checksum_32.h

^1da177e4c3f41 include/asm-i386/checksum.h        Linus Torvalds  2005-04-16  143  
^1da177e4c3f41 include/asm-i386/checksum.h        Linus Torvalds  2005-04-16  144  #define _HAVE_ARCH_IPV6_CSUM
0883e91ae209f4 include/asm-x86/checksum_32.h      Joe Perches     2008-03-23  145  static inline __sum16 csum_ipv6_magic(const struct in6_addr *saddr,
72685fcd286e94 include/asm-i386/checksum.h        Al Viro         2006-11-14  146  				      const struct in6_addr *daddr,
1e94082963747b arch/x86/include/asm/checksum_32.h Alexander Duyck 2016-03-11  147  				      __u32 len, __u8 proto, __wsum sum)
^1da177e4c3f41 include/asm-i386/checksum.h        Linus Torvalds  2005-04-16  148  {
0883e91ae209f4 include/asm-x86/checksum_32.h      Joe Perches     2008-03-23 @149  	asm("addl 0(%1), %0	;\n"
^1da177e4c3f41 include/asm-i386/checksum.h        Linus Torvalds  2005-04-16  150  	    "adcl 4(%1), %0	;\n"
^1da177e4c3f41 include/asm-i386/checksum.h        Linus Torvalds  2005-04-16  151  	    "adcl 8(%1), %0	;\n"
^1da177e4c3f41 include/asm-i386/checksum.h        Linus Torvalds  2005-04-16  152  	    "adcl 12(%1), %0	;\n"
^1da177e4c3f41 include/asm-i386/checksum.h        Linus Torvalds  2005-04-16  153  	    "adcl 0(%2), %0	;\n"
^1da177e4c3f41 include/asm-i386/checksum.h        Linus Torvalds  2005-04-16  154  	    "adcl 4(%2), %0	;\n"
^1da177e4c3f41 include/asm-i386/checksum.h        Linus Torvalds  2005-04-16  155  	    "adcl 8(%2), %0	;\n"
^1da177e4c3f41 include/asm-i386/checksum.h        Linus Torvalds  2005-04-16  156  	    "adcl 12(%2), %0	;\n"
^1da177e4c3f41 include/asm-i386/checksum.h        Linus Torvalds  2005-04-16  157  	    "adcl %3, %0	;\n"
^1da177e4c3f41 include/asm-i386/checksum.h        Linus Torvalds  2005-04-16  158  	    "adcl %4, %0	;\n"
^1da177e4c3f41 include/asm-i386/checksum.h        Linus Torvalds  2005-04-16  159  	    "adcl $0, %0	;\n"
^1da177e4c3f41 include/asm-i386/checksum.h        Linus Torvalds  2005-04-16  160  	    : "=&r" (sum)
^1da177e4c3f41 include/asm-i386/checksum.h        Linus Torvalds  2005-04-16  161  	    : "r" (saddr), "r" (daddr),
392d814daf460a arch/x86/include/asm/checksum_32.h Samuel Thibault 2009-10-01  162  	      "r" (htonl(len)), "r" (htonl(proto)), "0" (sum)
392d814daf460a arch/x86/include/asm/checksum_32.h Samuel Thibault 2009-10-01  163  	    : "memory");
^1da177e4c3f41 include/asm-i386/checksum.h        Linus Torvalds  2005-04-16  164  
^1da177e4c3f41 include/asm-i386/checksum.h        Linus Torvalds  2005-04-16  165  	return csum_fold(sum);
^1da177e4c3f41 include/asm-i386/checksum.h        Linus Torvalds  2005-04-16  166  }
^1da177e4c3f41 include/asm-i386/checksum.h        Linus Torvalds  2005-04-16  167  

:::::: The code at line 149 was first introduced by commit
:::::: 0883e91ae209f4ada4db9b383026df77351c1320 include/asm-x86/checksum_32.h: checkpatch cleanups - formatting only

:::::: TO: Joe Perches <joe@...ches.com>
:::::: CC: Ingo Molnar <mingo@...e.hu>

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