linux-kernel - Re: [PATCH 17/36] arm64, thp: remove infrastructure for handling splitting PMDs

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Date:	Wed, 15 Jul 2015 16:23:57 +0100
From:	"Suzuki K. Poulose" <Suzuki.Poulose@....com>
To:	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Hugh Dickins <hughd@...gle.com>
CC:	Dave Hansen <dave.hansen@...el.com>, Mel Gorman <mgorman@...e.de>,
	Rik van Riel <riel@...hat.com>,
	Vlastimil Babka <vbabka@...e.cz>,
	Christoph Lameter <cl@...two.org>,
	Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
	Steve Capper <steve.capper@...aro.org>,
	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Michal Hocko <mhocko@...e.cz>,
	Jerome Marchand <jmarchan@...hat.com>,
	Sasha Levin <sasha.levin@...cle.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>
Subject: Re: [PATCH 17/36] arm64, thp: remove infrastructure for handling
 splitting PMDs

On 10/07/15 18:41, Kirill A. Shutemov wrote:
> With new refcounting we don't need to mark PMDs splitting. Let's drop
> code to handle this.
>
> pmdp_splitting_flush() is not needed too: on splitting PMD we will do
> pmdp_clear_flush() + set_pte_at(). pmdp_clear_flush() will do IPI as
> needed for fast_gup.
>
> Signed-off-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
> ---
>   arch/arm64/include/asm/pgtable.h |  9 ---------
>   arch/arm64/mm/flush.c            | 16 ----------------
>   2 files changed, 25 deletions(-)
>
> diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h
> index bd5db28324ba..37cdbf37934c 100644
> --- a/arch/arm64/include/asm/pgtable.h
> +++ b/arch/arm64/include/asm/pgtable.h
> @@ -274,20 +274,11 @@ static inline pgprot_t mk_sect_prot(pgprot_t prot)
>
>   #ifdef CONFIG_TRANSPARENT_HUGEPAGE
>   #define pmd_trans_huge(pmd)	(pmd_val(pmd) && !(pmd_val(pmd) & PMD_TABLE_BIT))
> -#define pmd_trans_splitting(pmd)	pte_special(pmd_pte(pmd))
> -#ifdef CONFIG_HAVE_RCU_TABLE_FREE
> -#define __HAVE_ARCH_PMDP_SPLITTING_FLUSH
> -struct vm_area_struct;
> -void pmdp_splitting_flush(struct vm_area_struct *vma, unsigned long address,
> -			  pmd_t *pmdp);
> -#endif /* CONFIG_HAVE_RCU_TABLE_FREE */
> -#endif /* CONFIG_TRANSPARENT_HUGEPAGE */

Wouldn't this cause a build failure(Untested) ? We need to retain the last line,

#endif /* CONFIG_TRANSPARENT_HUGEPAGE */

isn't it ?


Thanks
Suzuki

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