linux-kernel - Re: [PATCH v2 1/2] thp: add HPAGE_PMD_* definitions for !CONFIG_TRANSPARENT

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Date:	Fri, 2 Mar 2012 13:20:22 +0100
From:	Andrea Arcangeli <aarcange@...hat.com>
To:	Naoya Horiguchi <n-horiguchi@...jp.nec.com>
Cc:	linux-mm@...ck.org, Andrew Morton <akpm@...ux-foundation.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Daisuke Nishimura <nishimura@....nes.nec.co.jp>,
	Hillf Danton <dhillf@...il.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/2] thp: add HPAGE_PMD_* definitions for
 !CONFIG_TRANSPARENT_HUGEPAGE

On Thu, Mar 01, 2012 at 07:31:52PM -0500, Naoya Horiguchi wrote:
> These macros will be used in later patch, where all usage are expected
> to be optimized away without #ifdef CONFIG_TRANSPARENT_HUGEPAGE.
> But to detect unexpected usages, we convert existing BUG() to BUILD_BUG().
> 
> Signed-off-by: Naoya Horiguchi <n-horiguchi@...jp.nec.com>
> ---
>  include/linux/huge_mm.h |   11 ++++++-----
>  1 files changed, 6 insertions(+), 5 deletions(-)
> 
> diff --git linux-next-20120228.orig/include/linux/huge_mm.h linux-next-20120228/include/linux/huge_mm.h
> index f56cacb..c8af7a2 100644
> --- linux-next-20120228.orig/include/linux/huge_mm.h
> +++ linux-next-20120228/include/linux/huge_mm.h
> @@ -51,6 +51,9 @@ extern pmd_t *page_check_address_pmd(struct page *page,
>  				     unsigned long address,
>  				     enum page_check_address_pmd_flag flag);
>  
> +#define HPAGE_PMD_ORDER (HPAGE_PMD_SHIFT-PAGE_SHIFT)
> +#define HPAGE_PMD_NR (1<<HPAGE_PMD_ORDER)
> +
>  #ifdef CONFIG_TRANSPARENT_HUGEPAGE
>  #define HPAGE_PMD_SHIFT HPAGE_SHIFT
>  #define HPAGE_PMD_MASK HPAGE_MASK
> @@ -102,8 +105,6 @@ extern void __split_huge_page_pmd(struct mm_struct *mm, pmd_t *pmd);
>  		BUG_ON(pmd_trans_splitting(*____pmd) ||			\
>  		       pmd_trans_huge(*____pmd));			\
>  	} while (0)
> -#define HPAGE_PMD_ORDER (HPAGE_PMD_SHIFT-PAGE_SHIFT)
> -#define HPAGE_PMD_NR (1<<HPAGE_PMD_ORDER)
>  #if HPAGE_PMD_ORDER > MAX_ORDER
>  #error "hugepages can't be allocated by the buddy allocator"
>  #endif

I did the same change to make AutoNUMA build in all configs/archs.

> @@ -158,9 +159,9 @@ static inline struct page *compound_trans_head(struct page *page)
>  	return page;
>  }
>  #else /* CONFIG_TRANSPARENT_HUGEPAGE */
> -#define HPAGE_PMD_SHIFT ({ BUG(); 0; })
> -#define HPAGE_PMD_MASK ({ BUG(); 0; })
> -#define HPAGE_PMD_SIZE ({ BUG(); 0; })
> +#define HPAGE_PMD_SHIFT ({ BUILD_BUG(); 0; })
> +#define HPAGE_PMD_MASK ({ BUILD_BUG(); 0; })
> +#define HPAGE_PMD_SIZE ({ BUILD_BUG(); 0; })

Builds with my config with THP=off. Thanks.

Reviewed-by: Andrea Arcangeli <aarcange@...hat.com>
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