linux-kernel - Re: [PATCH V5 1/3] mm/thp: Split out pmd collpase flush into a separate functions

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Message-ID: <871tihn8e4.fsf@linux.vnet.ibm.com>
Date:	Fri, 15 May 2015 21:24:43 +0530
From:	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
To:	akpm@...ux-foundation.org, benh@...nel.crashing.org,
	paulus@...ba.org, mpe@...erman.id.au,
	kirill.shutemov@...ux.intel.com, aarcange@...hat.com,
	schwidefsky@...ibm.com
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH V5 1/3] mm/thp: Split out pmd collpase flush into a separate functions


 diff --git a/include/asm-generic/pgtable.h b/include/asm-generic/pgtable.h
> index 39f1d6a2b04d..acdcaac77d93 100644
> --- a/include/asm-generic/pgtable.h
> +++ b/include/asm-generic/pgtable.h
> @@ -189,6 +189,28 @@ extern void pmdp_splitting_flush(struct vm_area_struct *vma,
>  				 unsigned long address, pmd_t *pmdp);
>  #endif
>
> +#ifndef pmdp_collapse_flush
> +#define pmdp_collapse_flush pmdp_collapse_flush
> +#ifdef CONFIG_TRANSPARENT_HUGEPAGE
> +static inline pmd_t pmdp_collapse_flush(struct vm_area_struct *vma,
> +					unsigned long address,
> +					pmd_t *pmdp)


extra pmdp_collapse_flush #define here

> +{
> +	return pmdp_clear_flush(vma, address, pmdp);
> +}
> +#define pmdp_collapse_flush pmdp_collapse_flush
> +#else
> +static inline pmd_t pmdp_collapse_flush(struct vm_area_struct *vma,
> +					unsigned long address,
> +					pmd_t *pmdp)
> +{
> +	BUILD_BUG();
> +	return *pmdp;
> +}
> +#define pmdp_collapse_flush pmdp_collapse_flush
> +#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
> +#endif
> +
>  #ifndef __HAVE_ARCH_PGTABLE_DEPOSIT
>  extern void pgtable_trans_huge_deposit(struct mm_struct *mm, pmd_t *pmdp,
>  				       pgtable_t pgtable);

diff --git a/include/asm-generic/pgtable.h b/include/asm-generic/pgtable.h
index acdcaac77d93..2c3ca89e9aee 100644
--- a/include/asm-generic/pgtable.h
+++ b/include/asm-generic/pgtable.h
@@ -190,7 +190,6 @@ extern void pmdp_splitting_flush(struct vm_area_struct *vma,
 #endif
 
 #ifndef pmdp_collapse_flush
-#define pmdp_collapse_flush pmdp_collapse_flush
 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
 static inline pmd_t pmdp_collapse_flush(struct vm_area_struct *vma,
 					unsigned long address,

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