linux-kernel - arch/x86/include/asm/pgtable.h:888:2: error: implicit declaration of function 'native_pud

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Date:   Sun, 12 Mar 2017 06:55:59 +0800
From:   kbuild test robot <fengguang.wu@...el.com>
To:     Matthew Wilcox <willy@...ux.intel.com>
Cc:     kbuild-all@...org, linux-kernel@...r.kernel.org,
        Dave Jiang <dave.jiang@...el.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linux Memory Management List <linux-mm@...ck.org>
Subject: arch/x86/include/asm/pgtable.h:888:2: error: implicit declaration of
 function 'native_pud_clear'

Hi Matthew,

FYI, the error/warning still remains.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   84c37c168c0e49a412d7021cda3183a72adac0d0
commit: a00cc7d9dd93d66a3fb83fc52aa57a4bec51c517 mm, x86: add support for PUD-sized transparent hugepages
date:   2 weeks ago
config: i386-randconfig-a0-201711 (attached as .config)
compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901
reproduce:
        git checkout a00cc7d9dd93d66a3fb83fc52aa57a4bec51c517
        # save the attached .config to linux build tree
        make ARCH=i386 

All errors (new ones prefixed by >>):

   In file included from include/linux/mm.h:68:0,
                    from include/linux/suspend.h:8,
                    from arch/x86/kernel/asm-offsets.c:12:
   arch/x86/include/asm/pgtable.h: In function 'native_local_pudp_get_and_clear':
>> arch/x86/include/asm/pgtable.h:888:2: error: implicit declaration of function 'native_pud_clear' [-Werror=implicit-function-declaration]
     native_pud_clear(pudp);
     ^~~~~~~~~~~~~~~~
   cc1: some warnings being treated as errors
   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 +/native_pud_clear +888 arch/x86/include/asm/pgtable.h

   882	}
   883	
   884	static inline pud_t native_local_pudp_get_and_clear(pud_t *pudp)
   885	{
   886		pud_t res = *pudp;
   887	
 > 888		native_pud_clear(pudp);
   889		return res;
   890	}
   891	

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