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: i386-tinyconfig (attached as .config)
compiler: gcc-7 (Debian 7.3.0-16) 7.3.0
reproduce:
        # save the attached .config to linux build tree
        make ARCH=i386 

Note: the linux-review/Yu-cheng-Yu/Control-Flow-Enforcement-Part-2/20180608-111152 HEAD 71d9d315a5e241d9b500540a452d0bec292e1dbb builds fine.
      It only hurts bisectibility.

All errors (new ones prefixed by >>):

   In file included from include/linux/memremap.h:8:0,
                    from include/linux/mm.h:27,
                    from include/linux/memcontrol.h:29,
                    from include/linux/swap.h:9,
                    from include/linux/suspend.h:5,
                    from arch/x86/kernel/asm-offsets.c:13:
   arch/x86/include/asm/pgtable.h: In function 'pte_dirty':
>> arch/x86/include/asm/pgtable.h:121:26: error: '_PAGE_DIRTY' undeclared (first use in this function); did you mean '_PAGE_DIRTY_HW'?
     return pte_flags(pte) & _PAGE_DIRTY;
                             ^~~~~~~~~~~
                             _PAGE_DIRTY_HW
   arch/x86/include/asm/pgtable.h:121:26: note: each undeclared identifier is reported only once for each function it appears in
   arch/x86/include/asm/pgtable.h: In function 'pmd_dirty':
   arch/x86/include/asm/pgtable.h:145:26: error: '_PAGE_DIRTY' undeclared (first use in this function); did you mean '_PAGE_DIRTY_HW'?
     return pmd_flags(pmd) & _PAGE_DIRTY;
                             ^~~~~~~~~~~
                             _PAGE_DIRTY_HW
   arch/x86/include/asm/pgtable.h: In function 'pud_dirty':
   arch/x86/include/asm/pgtable.h:155:26: error: '_PAGE_DIRTY' undeclared (first use in this function); did you mean '_PAGE_DIRTY_HW'?
     return pud_flags(pud) & _PAGE_DIRTY;
                             ^~~~~~~~~~~
                             _PAGE_DIRTY_HW
   arch/x86/include/asm/pgtable.h: In function 'pte_mkclean':
   arch/x86/include/asm/pgtable.h:286:30: error: '_PAGE_DIRTY' undeclared (first use in this function); did you mean '_PAGE_DIRTY_HW'?
     return pte_clear_flags(pte, _PAGE_DIRTY);
                                 ^~~~~~~~~~~
                                 _PAGE_DIRTY_HW
   arch/x86/include/asm/pgtable.h: In function 'pmd_mkclean':
   arch/x86/include/asm/pgtable.h:370:30: error: '_PAGE_DIRTY' undeclared (first use in this function); did you mean '_PAGE_DIRTY_HW'?
     return pmd_clear_flags(pmd, _PAGE_DIRTY);
                                 ^~~~~~~~~~~
                                 _PAGE_DIRTY_HW
   arch/x86/include/asm/pgtable.h: In function 'pud_mkclean':
   arch/x86/include/asm/pgtable.h:429:30: error: '_PAGE_DIRTY' undeclared (first use in this function); did you mean '_PAGE_DIRTY_HW'?
     return pud_clear_flags(pud, _PAGE_DIRTY);
                                 ^~~~~~~~~~~
                                 _PAGE_DIRTY_HW
   make[2]: *** [arch/x86/kernel/asm-offsets.s] Error 1
   make[2]: Target '__build' not remade because of errors.
   make[1]: *** [prepare0] Error 2
   make[1]: Target 'prepare' not remade because of errors.
   make: *** [sub-make] Error 2

vim +121 arch/x86/include/asm/pgtable.h

54321d947 arch/x86/include/asm/pgtable.h Jeremy Fitzhardinge 2009-02-11  114  
8405b122a include/asm-x86/pgtable.h      Jeremy Fitzhardinge 2008-01-30  115  /*
4614139c6 include/asm-x86/pgtable.h      Jeremy Fitzhardinge 2008-01-30  116   * The following only work if pte_present() is true.
4614139c6 include/asm-x86/pgtable.h      Jeremy Fitzhardinge 2008-01-30  117   * Undefined behaviour if not..
4614139c6 include/asm-x86/pgtable.h      Jeremy Fitzhardinge 2008-01-30  118   */
3cbaeafeb include/asm-x86/pgtable.h      Joe Perches         2008-03-23  119  static inline int pte_dirty(pte_t pte)
3cbaeafeb include/asm-x86/pgtable.h      Joe Perches         2008-03-23  120  {
a15af1c9e include/asm-x86/pgtable.h      Jeremy Fitzhardinge 2008-05-26 @121  	return pte_flags(pte) & _PAGE_DIRTY;
3cbaeafeb include/asm-x86/pgtable.h      Joe Perches         2008-03-23  122  }
3cbaeafeb include/asm-x86/pgtable.h      Joe Perches         2008-03-23  123  

:::::: The code at line 121 was first introduced by commit
:::::: a15af1c9ea2750a9ff01e51615c45950bad8221b x86/paravirt: add pte_flags to just get pte flags

:::::: TO: Jeremy Fitzhardinge <jeremy@goop.org>
:::::: CC: Thomas Gleixner <tglx@linutronix.de>

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