linux-kernel - Re: [PATCH v2 1/3] x86/mm: disable ioremap free page handling on x86-PAE

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Date:   Wed, 16 May 2018 19:00:53 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Toshi Kani <toshi.kani@....com>
Cc:     kbuild-all@...org, mhocko@...e.com, akpm@...ux-foundation.org,
        tglx@...utronix.de, mingo@...hat.com, hpa@...or.com,
        cpandya@...eaurora.org, linux-mm@...ck.org, x86@...nel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Toshi Kani <toshi.kani@....com>,
        Joerg Roedel <joro@...tes.org>, stable@...r.kernel.org
Subject: Re: [PATCH v2 1/3] x86/mm: disable ioremap free page handling on
 x86-PAE

Hi Toshi,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on arm64/for-next/core]
[also build test ERROR on v4.17-rc5 next-20180515]
[cannot apply to tip/x86/core]
[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/Toshi-Kani/fix-free-pmd-pte-page-handlings-on-x86/20180516-183317
base:   https://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-next/core
config: i386-randconfig-x013-201819 (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/Toshi-Kani/fix-free-pmd-pte-page-handlings-on-x86/20180516-183317 HEAD 93944422fcef9bfadf22e345c1d7a34723cc3203 builds fine.
      It only hurts bisectibility.

All errors (new ones prefixed by >>):

>> arch/x86/mm/pgtable.c:757:5: error: conflicting types for 'pud_free_pmd_page'
    int pud_free_pmd_page(pud_t *pud, unsigned long addr)
        ^~~~~~~~~~~~~~~~~
   In file included from arch/x86/include/asm/pgtable.h:1301:0,
                    from include/linux/memremap.h:8,
                    from include/linux/mm.h:27,
                    from arch/x86/mm/pgtable.c:2:
   include/asm-generic/pgtable.h:1022:5: note: previous declaration of 'pud_free_pmd_page' was here
    int pud_free_pmd_page(pud_t *pud);
        ^~~~~~~~~~~~~~~~~
>> arch/x86/mm/pgtable.c:766:5: error: conflicting types for 'pmd_free_pte_page'
    int pmd_free_pte_page(pmd_t *pmd, unsigned long addr)
        ^~~~~~~~~~~~~~~~~
   In file included from arch/x86/include/asm/pgtable.h:1301:0,
                    from include/linux/memremap.h:8,
                    from include/linux/mm.h:27,
                    from arch/x86/mm/pgtable.c:2:
   include/asm-generic/pgtable.h:1023:5: note: previous declaration of 'pmd_free_pte_page' was here
    int pmd_free_pte_page(pmd_t *pmd);
        ^~~~~~~~~~~~~~~~~

vim +/pud_free_pmd_page +757 arch/x86/mm/pgtable.c

   756	
 > 757	int pud_free_pmd_page(pud_t *pud, unsigned long addr)
   758	{
   759		return pud_none(*pud);
   760	}
   761	
   762	/*
   763	 * Disable free page handling on x86-PAE. This assures that ioremap()
   764	 * does not update sync'd pmd entries. See vmalloc_sync_one().
   765	 */
 > 766	int pmd_free_pte_page(pmd_t *pmd, unsigned long addr)
   767	{
   768		return pmd_none(*pmd);
   769	}
   770	

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