Hi Yu-cheng,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on asm-generic/master]
[also build test ERROR on v4.17 next-20180607]
[cannot apply to tip/x86/core mmotm/master]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Yu-cheng-Yu/Control-Flow-Enforcement-Part-2/20180608-111152
base:   https://git.kernel.org/pub/scm/linux/kernel/git/arnd/asm-generic.git master
config: sparc64-allmodconfig (attached as .config)
compiler: sparc64-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
        # save the attached .config to linux build tree
        make.cross ARCH=sparc64 

All error/warnings (new ones prefixed by >>):

   In file included from arch/sparc/include/asm/pgtable_64.h:1064:0,
                    from arch/sparc/include/asm/pgtable.h:5,
                    from include/linux/memremap.h:8,
                    from include/linux/mm.h:27,
                    from mm//swap.c:16:
   include/asm-generic/pgtable.h: In function 'huge_ptep_set_wrorptect_flush':
>> include/asm-generic/pgtable.h:129:2: error: implicit declaration of function 'huge_ptep_set_wrprotect'; did you mean 'huge_ptep_set_wrorptect_flush'? [-Werror=implicit-function-declaration]
     huge_ptep_set_wrprotect(vma->vm_mm, addr, ptep);
     ^~~~~~~~~~~~~~~~~~~~~~~
     huge_ptep_set_wrorptect_flush
   In file included from include/linux/hugetlb.h:445:0,
                    from mm//swap.c:35:
   arch/sparc/include/asm/hugetlb.h: At top level:
>> arch/sparc/include/asm/hugetlb.h:59:20: warning: conflicting types for 'huge_ptep_set_wrprotect'
    static inline void huge_ptep_set_wrprotect(struct mm_struct *mm,
                       ^~~~~~~~~~~~~~~~~~~~~~~
>> arch/sparc/include/asm/hugetlb.h:59:20: error: static declaration of 'huge_ptep_set_wrprotect' follows non-static declaration
   In file included from arch/sparc/include/asm/pgtable_64.h:1064:0,
                    from arch/sparc/include/asm/pgtable.h:5,
                    from include/linux/memremap.h:8,
                    from include/linux/mm.h:27,
                    from mm//swap.c:16:
   include/asm-generic/pgtable.h:129:2: note: previous implicit declaration of 'huge_ptep_set_wrprotect' was here
     huge_ptep_set_wrprotect(vma->vm_mm, addr, ptep);
     ^~~~~~~~~~~~~~~~~~~~~~~
   cc1: some warnings being treated as errors

vim +129 include/asm-generic/pgtable.h

   123	
   124	#ifndef __HAVE_ARCH_HUGE_PTEP_SET_WRPROTECT_FLUSH
   125	static inline void huge_ptep_set_wrorptect_flush(struct vm_area_struct *vma,
   126							 unsigned long addr,
   127							 pte_t *ptep)
   128	{
 > 129		huge_ptep_set_wrprotect(vma->vm_mm, addr, ptep);
   130	}
   131	#endif
   132	

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