linux-kernel - Re: [PATCH trivial] include: asm-generic: Notice about 80 columns in pgtable-no*.h

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Message-ID: <201512152357.WYk2QnGK%fengguang.wu@intel.com>
Date:	Tue, 15 Dec 2015 23:34:58 +0800
From:	kbuild test robot <lkp@...el.com>
To:	Chen Gang <chengang@...ndsoft.com.cn>
Cc:	kbuild-all@...org, Arnd Bergmann <arnd@...db.de>,
	trivial@...nel.org, Linux-Arch <linux-arch@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH trivial] include: asm-generic: Notice about 80 columns in
 pgtable-no*.h

Hi Chen,

[auto build test ERROR on v4.4-rc5]
[also build test ERROR on next-20151215]

url:    https://github.com/0day-ci/linux/commits/Chen-Gang/include-asm-generic-Notice-about-80-columns-in-pgtable-no-h/20151215-221607
config: mips-xway_defconfig (attached as .config)
reproduce:
        wget https://git.kernel.org/cgit/linux/kernel/git/wfg/lkp-tests.git/plain/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        make.cross ARCH=mips 

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

   In file included from include/linux/mm.h:55:0,
                    from include/linux/pid_namespace.h:6,
                    from include/linux/ptrace.h:8,
                    from arch/mips/mm/fault.c:16:
   arch/mips/mm/fault.c: In function '__do_page_fault':
>> arch/mips/include/asm/pgtable.h:241:33: error: expected expression before 'do'
    #define set_pmd(pmdptr, pmdval) do { *(pmdptr) = (pmdval); } while(0)
                                    ^
>> include/asm-generic/pgtable-nopmd.h:41:36: note: in expansion of macro 'set_pmd'
    #define set_pud(pudptr, pudval)   (set_pmd((pmd_t *)(pudptr), \
                                       ^
>> include/asm-generic/pgtable-nopud.h:36:36: note: in expansion of macro 'set_pud'
    #define set_pgd(pgdptr, pgdval)   (set_pud((pud_t *)(pgdptr), \
                                       ^
>> arch/mips/mm/fault.c:314:3: note: in expansion of macro 'set_pgd'
      set_pgd(pgd, *pgd_k);
      ^

vim +/set_pmd +41 include/asm-generic/pgtable-nopmd.h

    25	 * The "pud_xxx()" functions here are trivial for a folded two-level
    26	 * setup: the pmd is never bad, and a pmd always exists (as it's folded
    27	 * into the pud entry)
    28	 */
    29	static inline int pud_none(pud_t pud)		{ return 0; }
    30	static inline int pud_bad(pud_t pud)		{ return 0; }
    31	static inline int pud_present(pud_t pud)	{ return 1; }
    32	static inline void pud_clear(pud_t *pud)	{ }
    33	#define pmd_ERROR(pmd)				(pud_ERROR((pmd).pud))
    34	
    35	#define pud_populate(mm, pmd, pte)		do { } while (0)
    36	
    37	/*
    38	 * (pmds are folded into puds so this doesn't get actually called,
    39	 * but the define is needed for a generic inline function.)
    40	 */
  > 41	#define set_pud(pudptr, pudval)			(set_pmd((pmd_t *)(pudptr), \
    42								(pmd_t) { pudval }))
    43	
    44	static inline pmd_t * pmd_offset(pud_t * pud, unsigned long address)
    45	{
    46		return (pmd_t *)pud;
    47	}
    48	
    49	#define pmd_val(x)				(pud_val((x).pud))

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