linux-kernel - Re: [PATCH 1/8] hugetlb: move definition of is_vm_hugetlb_page() to hugepage

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Date:	Fri, 28 May 2010 11:03:50 +0100
From:	Mel Gorman <mel@....ul.ie>
To:	Naoya Horiguchi <n-horiguchi@...jp.nec.com>
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	Andi Kleen <andi@...stfloor.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Wu Fengguang <fengguang.wu@...el.com>
Subject: Re: [PATCH 1/8] hugetlb: move definition of is_vm_hugetlb_page()
	to hugepage_inline.h

On Fri, May 28, 2010 at 09:29:15AM +0900, Naoya Horiguchi wrote:
> is_vm_hugetlb_page() is a widely used inline function to insert hooks
> into hugetlb code.
> But we can't use it in pagemap.h because of circular dependency of
> the header files. This patch removes this limitation.
> 
> Signed-off-by: Naoya Horiguchi <n-horiguchi@...jp.nec.com>
> ---
>  include/linux/hugetlb.h        |   11 +----------
>  include/linux/hugetlb_inline.h |   22 ++++++++++++++++++++++
>  include/linux/pagemap.h        |    1 +
>  3 files changed, 24 insertions(+), 10 deletions(-)
>  create mode 100644 include/linux/hugetlb_inline.h
> 
> diff --git v2.6.34/include/linux/hugetlb.h v2.6.34/include/linux/hugetlb.h
> index 78b4bc6..d47a7c4 100644
> --- v2.6.34/include/linux/hugetlb.h
> +++ v2.6.34/include/linux/hugetlb.h
> @@ -2,6 +2,7 @@
>  #define _LINUX_HUGETLB_H
>  
>  #include <linux/fs.h>
> +#include <linux/hugetlb_inline.h>
>  
>  struct ctl_table;
>  struct user_struct;
> @@ -14,11 +15,6 @@ struct user_struct;
>  
>  int PageHuge(struct page *page);
>  
> -static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
> -{
> -	return vma->vm_flags & VM_HUGETLB;
> -}
> -
>  void reset_vma_resv_huge_pages(struct vm_area_struct *vma);
>  int hugetlb_sysctl_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *);
>  int hugetlb_overcommit_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *);
> @@ -77,11 +73,6 @@ static inline int PageHuge(struct page *page)
>  	return 0;
>  }
>  
> -static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
> -{
> -	return 0;
> -}
> -
>  static inline void reset_vma_resv_huge_pages(struct vm_area_struct *vma)
>  {
>  }
> diff --git v2.6.34/include/linux/hugetlb_inline.h v2.6.34/include/linux/hugetlb_inline.h
> new file mode 100644
> index 0000000..cf00b6d
> --- /dev/null
> +++ v2.6.34/include/linux/hugetlb_inline.h
> @@ -0,0 +1,22 @@
> +#ifndef _LINUX_HUGETLB_INLINE_H
> +#define _LINUX_HUGETLB_INLINE_H 1
> +

Just #define __LINUX_HUGETLB_INLINE_H is fine. No need for the 1

> +#ifdef CONFIG_HUGETLBFS
> +

Should be CONFIG_HUGETLB_PAGE

With those corrections;

Acked-by: Mel Gorman <mel@....ul.ie>

> +#include <linux/mm.h>
> +
> +static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
> +{
> +	return vma->vm_flags & VM_HUGETLB;
> +}
> +
> +#else
> +
> +static inline int is_vm_hugetlb_page(struct vm_area_struct *vma)
> +{
> +	return 0;
> +}
> +
> +#endif
> +
> +#endif
> diff --git v2.6.34/include/linux/pagemap.h v2.6.34/include/linux/pagemap.h
> index 3c62ed4..b2bd2ba 100644
> --- v2.6.34/include/linux/pagemap.h
> +++ v2.6.34/include/linux/pagemap.h
> @@ -13,6 +13,7 @@
>  #include <linux/gfp.h>
>  #include <linux/bitops.h>
>  #include <linux/hardirq.h> /* for in_interrupt() */
> +#include <linux/hugetlb_inline.h>
>  
>  /*
>   * Bits in mapping->flags.  The lower __GFP_BITS_SHIFT bits are the page
> -- 
> 1.7.0
> 

-- 
Mel Gorman
Part-time Phd Student                          Linux Technology Center
University of Limerick                         IBM Dublin Software Lab
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