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

FYI, the error/warning still remains.

tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: 310c7585e8300ddc46211df0757c11e4299ec482
commit: 21924765862a0871908a35cb0e53e2e1c169b888 SUNRPC: use cmpxchg64() in gss_seq_send64_fetch_and_inc()
date: 4 weeks ago
config: mips-nlm_xlr_defconfig (attached as .config)
compiler: mips-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=mips

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

---
0-DAY kernel test infrastructure Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all Intel Corporation
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