[PATCH] net: untag pointer in sockptr_is_kernel

[kernel test robot]

Hi Miles,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on net-next/master]
[also build test ERROR on linus/master]
[cannot apply to net/master hch-configfs/for-next sparc-next/master v5.8 next-20200811]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/Miles-Chen/net-untag-pointer-in-sockptr_is_kernel/20200811-183033
base:   https://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git bfdd5aaa54b0a44d9df550fe4c9db7e1470a11b8
config: x86_64-randconfig-s022-20200811 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-15) 9.3.0
reproduce:
        # apt-get install sparse
        # sparse version: v0.6.2-168-g9554805c-dirty
        # save the attached .config to linux build tree
        make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=x86_64 

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

All errors (new ones prefixed by >>):

   In file included from include/linux/net.h:24,
                    from net/core/stream.c:18:
   include/linux/sockptr.h: In function 'sockptr_is_kernel':
>> include/linux/sockptr.h:23:24: error: implicit declaration of function 'untagged_addr' [-Werror=implicit-function-declaration]
      23 |  return (unsigned long)untagged_addr(sockptr.kernel) >= TASK_SIZE;
         |                        ^~~~~~~~~~~~~
   cc1: some warnings being treated as errors
--
   In file included from include/linux/net.h:24,
                    from net/ipv6/ip6_fib.c:20:
   include/linux/sockptr.h: In function 'sockptr_is_kernel':
>> include/linux/sockptr.h:23:24: error: implicit declaration of function 'untagged_addr' [-Werror=implicit-function-declaration]
      23 |  return (unsigned long)untagged_addr(sockptr.kernel) >= TASK_SIZE;
         |                        ^~~~~~~~~~~~~
   net/ipv6/ip6_fib.c: In function 'fib6_add':
   net/ipv6/ip6_fib.c:1373:25: warning: variable 'pn' set but not used [-Wunused-but-set-variable]
    1373 |  struct fib6_node *fn, *pn = NULL;
         |                         ^~
   cc1: some warnings being treated as errors
--
   In file included from include/linux/net.h:24,
                    from net/ipv6/udp.c:24:
   include/linux/sockptr.h: In function 'sockptr_is_kernel':
>> include/linux/sockptr.h:23:24: error: implicit declaration of function 'untagged_addr' [-Werror=implicit-function-declaration]
      23 |  return (unsigned long)untagged_addr(sockptr.kernel) >= TASK_SIZE;
         |                        ^~~~~~~~~~~~~
   net/ipv6/udp.c: At top level:
   net/ipv6/udp.c:1029:30: warning: no previous prototype for 'udp_v6_early_demux' [-Wmissing-prototypes]
    1029 | INDIRECT_CALLABLE_SCOPE void udp_v6_early_demux(struct sk_buff *skb)
         |                              ^~~~~~~~~~~~~~~~~~
   net/ipv6/udp.c:1070:29: warning: no previous prototype for 'udpv6_rcv' [-Wmissing-prototypes]
    1070 | INDIRECT_CALLABLE_SCOPE int udpv6_rcv(struct sk_buff *skb)
         |                             ^~~~~~~~~
   cc1: some warnings being treated as errors

vim +/untagged_addr +23 include/linux/sockptr.h

    20	
    21	static inline bool sockptr_is_kernel(sockptr_t sockptr)
    22	{
  > 23		return (unsigned long)untagged_addr(sockptr.kernel) >= TASK_SIZE;
    24	}
    25	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
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