linux-kernel - Re: [PATCH 08/11] mm,thp: reduce ifdef'ery for THP in generic code

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Date:	Wed, 16 Sep 2015 15:25:40 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Vineet Gupta <Vineet.Gupta1@...opsys.com>
Cc:	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Mel Gorman <mgorman@...e.de>,
	"Matthew Wilcox" <matthew.r.wilcox@...el.com>,
	Minchan Kim <minchan@...nel.org>, <linux-arch@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <linux-mm@...ck.org>,
	<arc-linux-dev@...opsys.com>
Subject: Re: [PATCH 08/11] mm,thp: reduce ifdef'ery for THP in generic code

On Thu, 27 Aug 2015 14:33:11 +0530 Vineet Gupta <Vineet.Gupta1@...opsys.com> wrote:

> This is purely cosmetic, just makes code more readable
> 
> ...
>
> --- a/include/asm-generic/pgtable.h
> +++ b/include/asm-generic/pgtable.h
> @@ -30,9 +30,20 @@ extern int ptep_set_access_flags(struct vm_area_struct *vma,
>  #endif
>  
>  #ifndef __HAVE_ARCH_PMDP_SET_ACCESS_FLAGS
> +#ifdef CONFIG_TRANSPARENT_HUGEPAGE
>  extern int pmdp_set_access_flags(struct vm_area_struct *vma,
>  				 unsigned long address, pmd_t *pmdp,
>  				 pmd_t entry, int dirty);
> +#else /* CONFIG_TRANSPARENT_HUGEPAGE */
> +static inline int pmdp_set_access_flags(struct vm_area_struct *vma,
> +					unsigned long address, pmd_t *pmdp,
> +					pmd_t entry, int dirty)
> +{
> +	BUG();
> +	return 0;
> +}

Is it possible to simply leave this undefined?  So the kernel fails at
link time?

> --- a/mm/pgtable-generic.c
> +++ b/mm/pgtable-generic.c

Good heavens that file is a mess.  Your patch does improve it.


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