Hi NeilBrown,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on nfsd/nfsd-next]
[also build test WARNING on nfs/linux-next cel/for-next v5.7-rc6 next-20200519]
[if your patch is applied to the wrong git tree, please drop us a note to help
improve the system. BTW, we also suggest to use '--base' option to specify the
base tree in git format-patch, please see https://stackoverflow.com/a/37406982]

url:    https://github.com/0day-ci/linux/commits/NeilBrown/SUNRPC-svc-fix-gss-flavour-registration-problems/20200521-112443
base:   git://linux-nfs.org/~bfields/linux.git nfsd-next
config: um-allmodconfig (attached as .config)
compiler: gcc-7 (Ubuntu 7.5.0-6ubuntu2) 7.5.0
reproduce (this is a W=1 build):
        # save the attached .config to linux build tree
        make ARCH=um 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kbuild test robot <lkp@intel.com>

All warnings (new ones prefixed by >>, old ones prefixed by <<):

cc1: warning: arch/um/include/uapi: No such file or directory [-Wmissing-include-dirs]
In file included from include/linux/uaccess.h:11:0,
from include/linux/sched/task.h:11,
from include/linux/sched/signal.h:9,
from include/linux/sunrpc/types.h:14,
from net/sunrpc/svcauth.c:15:
arch/um/include/asm/uaccess.h: In function '__access_ok':
arch/um/include/asm/uaccess.h:17:29: warning: comparison of unsigned expression >= 0 is always true [-Wtype-limits]
(((unsigned long) (addr) >= FIXADDR_USER_START) &&                                 ^
arch/um/include/asm/uaccess.h:45:3: note: in expansion of macro '__access_ok_vsyscall'
__access_ok_vsyscall(addr, size) ||
^~~~~~~~~~~~~~~~~~~~
In file included from include/linux/kernel.h:11:0,
from include/linux/list.h:9,
from include/linux/module.h:12,
from net/sunrpc/svcauth.c:14:
include/asm-generic/fixmap.h: In function 'fix_to_virt':
include/asm-generic/fixmap.h:32:19: warning: comparison of unsigned expression >= 0 is always true [-Wtype-limits]
BUILD_BUG_ON(idx >= __end_of_fixed_addresses);
^
include/linux/compiler.h:330:9: note: in definition of macro '__compiletime_assert'
if (!(condition))                 ^~~~~~~~~
include/linux/compiler.h:350:2: note: in expansion of macro '_compiletime_assert'
_compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
^~~~~~~~~~~~~~~~~~~
include/linux/build_bug.h:39:37: note: in expansion of macro 'compiletime_assert'
#define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
^~~~~~~~~~~~~~~~~~
include/linux/build_bug.h:50:2: note: in expansion of macro 'BUILD_BUG_ON_MSG'
BUILD_BUG_ON_MSG(condition, "BUILD_BUG_ON failed: " #condition)
^~~~~~~~~~~~~~~~
include/asm-generic/fixmap.h:32:2: note: in expansion of macro 'BUILD_BUG_ON'
BUILD_BUG_ON(idx >= __end_of_fixed_addresses);
^~~~~~~~~~~~
net/sunrpc/svcauth.c: At top level:
>> net/sunrpc/svcauth.c:209:6: warning: no previous prototype for 'auth_domain_cleanup' [-Wmissing-prototypes]
void auth_domain_cleanup(void)
^~~~~~~~~~~~~~~~~~~

vim +/auth_domain_cleanup +209 net/sunrpc/svcauth.c

   208	
 > 209	void auth_domain_cleanup(void)

---
0-DAY CI Kernel Test Service, Intel Corporation
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