Hi Mickaël,

Thank you for the patch! Perhaps something to improve:

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

url:    https://github.com/0day-ci/linux/commits/Micka-l-Sala-n/Landlock-LSM-Toward-unprivileged-sandboxing/20180228-233659
base:   https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git master
config: x86_64-randconfig-x017-201808 (attached as .config)
compiler: gcc-7 (Debian 7.3.0-1) 7.3.0
reproduce:
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All warnings (new ones prefixed by >>):

   In file included from fs//quota/dquot.c:74:0:
>> include/linux/security.h:815:10: warning: 'struct nameidata_lookup' declared inside parameter list will not be visible outside of this definition or declaration
      struct nameidata_lookup *lookup, struct inode *inode)
             ^~~~~~~~~~~~~~~~

vim +815 include/linux/security.h

   813	
   814	static inline void security_nameidata_put_lookup(
 > 815			struct nameidata_lookup *lookup, struct inode *inode)
   816	{ }
   817	

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