Hi Chenbo,

[auto build test WARNING on net-next/master]

url:    https://github.com/0day-ci/linux/commits/Chenbo-Feng/bpf-security-New-file-mode-and-LSM-hooks-for-eBPF-object-permission-control/20171011-010349
config: x86_64-randconfig-u0-10110310 (attached as .config)
compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901
reproduce:
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All warnings (new ones prefixed by >>):

   In file included from include/linux/init.h:4:0,
                    from security/selinux/hooks.c:27:
   security/selinux/hooks.c: In function 'bpf_map_fmode_to_av':
   security/selinux/hooks.c:6284:6: error: 'f_mode' undeclared (first use in this function)
     if (f_mode & FMODE_READ)
         ^
   include/linux/compiler.h:156:30: note: in definition of macro '__trace_if'
     if (__builtin_constant_p(!!(cond)) ? !!(cond) :   \
                                 ^~~~

quoted

security/selinux/hooks.c:6284:2: note: in expansion of macro 'if'

     if (f_mode & FMODE_READ)
     ^~
   security/selinux/hooks.c:6284:6: note: each undeclared identifier is reported only once for each function it appears in
     if (f_mode & FMODE_READ)
         ^
   include/linux/compiler.h:156:30: note: in definition of macro '__trace_if'
     if (__builtin_constant_p(!!(cond)) ? !!(cond) :   \
                                 ^~~~

quoted

security/selinux/hooks.c:6284:2: note: in expansion of macro 'if'

     if (f_mode & FMODE_READ)
     ^~

vim +/if +6284 security/selinux/hooks.c

  6279	
  6280	static u32 bpf_map_fmode_to_av(fmode_t fmode)
  6281	{
  6282		u32 av = 0;
  6283	

6284		if (f_mode & FMODE_READ)

  6285			av |= BPF_MAP__READ;
  6286		if (f_mode & FMODE_WRITE)
  6287			av |= BPF_MAP__WRITE;
  6288		return av;
  6289	}
  6290	

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