linux-kernel - Re: [PATCH] mm: Define set_pmd_at for numabalance for CONFIG

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Date:	Fri, 18 Jan 2013 13:39:01 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Michal Hocko <mhocko@...e.cz>
Cc:	linux-mm@...ck.org, Andrea Arcangeli <aarcange@...hat.com>,
	Mel Gorman <mgorman@...e.de>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm: Define set_pmd_at for numabalance for
 CONFIG_PARAVIRT

On Fri, 18 Jan 2013 10:33:24 +0100
Michal Hocko <mhocko@...e.cz> wrote:

> CONFIG_PARAVIRT defines set_pmd_at only for CONFIG_TRANSPARENT_HUGEPAGE
> which leads to the following compile errors when randconfig selected
> CONFIG_NUMA_BALANCING && CONFIG_PARAVIRT && !CONFIG_TRANSPARENT_HUGEPAGE:
> 
> mm/mprotect.c: In function ___change_pmd_protnuma___:
> mm/mprotect.c:120: error: implicit declaration of function ___set_pmd_at___
> 
> mm/memory.c: In function ___do_pmd_numa_page___:
> mm/memory.c:3529: error: implicit declaration of function ___set_pmd_at___
> 
> Signed-off-by: Michal Hocko <mhocko@...e.cz>
> ---
>  arch/x86/include/asm/paravirt.h |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/x86/include/asm/paravirt.h b/arch/x86/include/asm/paravirt.h
> index a0facf3..f551e89 100644
> --- a/arch/x86/include/asm/paravirt.h
> +++ b/arch/x86/include/asm/paravirt.h
> @@ -528,7 +528,7 @@ static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
>  		PVOP_VCALL4(pv_mmu_ops.set_pte_at, mm, addr, ptep, pte.pte);
>  }
>  
> -#ifdef CONFIG_TRANSPARENT_HUGEPAGE
> +#if defined(CONFIG_TRANSPARENT_HUGEPAGE) || defined(CONFIG_NUMA_BALANCING)
>  static inline void set_pmd_at(struct mm_struct *mm, unsigned long addr,
>  			      pmd_t *pmdp, pmd_t pmd)
>  {

Confused - there is no "#ifdef CONFIG_TRANSPARENT_HUGEPAGE" in there in
any kernel version I can think of.

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