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

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Date:   Tue, 14 Mar 2017 08:56:34 +0800
From:   Fengguang Wu <fengguang.wu@...el.com>
To:     Dave Jiang <dave.jiang@...el.com>
Cc:     Matthew Wilcox <willy@...ux.intel.com>, kbuild-all@...org,
        linux-kernel@...r.kernel.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linux Memory Management List <linux-mm@...ck.org>
Subject: Re: arch/x86/include/asm/pgtable.h:888:2: error: implicit
 declaration of function 'native_pud_clear'

Hi Dave,

On Mon, Mar 13, 2017 at 08:57:54AM -0700, Dave Jiang wrote:
>Fengguang,
>I don't believe Andrew has picked up this patch yet:
>http://marc.info/?l=linux-mm&m=148883870428812&w=2
>
>Unless you are seeing issues with that patch.

It looks the patch is not in mainline or linux-next yet:

% git show linus/master:arch/x86/include/asm/pgtable-3level.h |grep -C3 CONFIG_PARAVIRT
}

#if !defined(CONFIG_SMP) || (defined(CONFIG_HIGHMEM64G) && \
                defined(CONFIG_PARAVIRT))
static inline void native_pud_clear(pud_t *pudp)
{
}

% git show linux-next/master:arch/x86/include/asm/pgtable-3level.h |grep -C3 CONFIG_PARAVIRT
}

#if !defined(CONFIG_SMP) || (defined(CONFIG_HIGHMEM64G) && \
                defined(CONFIG_PARAVIRT))
static inline void native_pud_clear(pud_t *pudp)
{
}

Thanks,
Fengguang

>On 03/11/2017 03:55 PM, kbuild test robot wrote:
>> 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	
>>
>> ---
>> 0-DAY kernel test infrastructure                Open Source Technology Center
>> https://lists.01.org/pipermail/kbuild-all                   Intel Corporation
>>