net/sunrpc/auth_gss/gss_krb5_seal.c:144:14: error: implicit declaration of function 'cmpxchg64'; did you mean 'cmpxchg'?

[kbuild test robot]

Hi Arnd,

FYI, the error/warning still remains.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   5b7449810ae6d652629c550d3974c8453836d229
commit: 21924765862a0871908a35cb0e53e2e1c169b888 SUNRPC: use cmpxchg64() in gss_seq_send64_fetch_and_inc()
date:   4 weeks ago
config: sh-allyesconfig (attached as .config)
compiler: sh4-linux-gnu-gcc (Debian 7.2.0-11) 7.2.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        git checkout 21924765862a0871908a35cb0e53e2e1c169b888
        # save the attached .config to linux build tree
        GCC_VERSION=7.2.0 make.cross ARCH=sh 

All errors (new ones prefixed by >>):

   net/sunrpc/auth_gss/gss_krb5_seal.c: In function 'gss_seq_send64_fetch_and_inc':
>> net/sunrpc/auth_gss/gss_krb5_seal.c:144:14: error: implicit declaration of function 'cmpxchg64'; did you mean 'cmpxchg'? [-Werror=implicit-function-declaration]
      seq_send = cmpxchg64(&ctx->seq_send64, old, old + 1);
                 ^~~~~~~~~
                 cmpxchg
   cc1: some warnings being treated as errors

vim +144 net/sunrpc/auth_gss/gss_krb5_seal.c

   136	
   137	u64
   138	gss_seq_send64_fetch_and_inc(struct krb5_ctx *ctx)
   139	{
   140		u64 old, seq_send = READ_ONCE(ctx->seq_send);
   141	
   142		do {
   143			old = seq_send;
 > 144			seq_send = cmpxchg64(&ctx->seq_send64, old, old + 1);
   145		} while (old != seq_send);
   146		return seq_send;
   147	}
   148	

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