linux-kernel - Re: [PATCH v2 7/7] mm/pgtable: Don't accumulate addr during pgd prepopulate pmd

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Message-ID: <20130617082040.GC19194@dhcp22.suse.cz>
Date:	Mon, 17 Jun 2013 10:20:40 +0200
From:	Michal Hocko <mhocko@...e.cz>
To:	Wanpeng Li <liwanp@...ux.vnet.ibm.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	David Rientjes <rientjes@...gle.com>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Fengguang Wu <fengguang.wu@...el.com>,
	Rik van Riel <riel@...hat.com>,
	Andrew Shewmaker <agshew@...il.com>,
	Jiri Kosina <jkosina@...e.cz>,
	Namjae Jeon <linkinjeon@...il.com>, Jan Kara <jack@...e.cz>,
	Tejun Heo <tj@...nel.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 7/7] mm/pgtable: Don't accumulate addr during pgd
 prepopulate pmd

On Sun 16-06-13 09:14:50, Wanpeng Li wrote:
> The old codes accumulate addr to get right pmd, however,
> currently pmds are preallocated and transfered as a parameter,
> there is unnecessary to accumulate addr variable any more, this
> patch remove it.
> 
> Signed-off-by: Wanpeng Li <liwanp@...ux.vnet.ibm.com>

Reviewed-by: Michal Hocko <mhocko@...e.cz>

> ---
>  arch/x86/mm/pgtable.c | 4 +---
>  1 file changed, 1 insertion(+), 3 deletions(-)
> 
> diff --git a/arch/x86/mm/pgtable.c b/arch/x86/mm/pgtable.c
> index 17fda6a..cb787da 100644
> --- a/arch/x86/mm/pgtable.c
> +++ b/arch/x86/mm/pgtable.c
> @@ -240,7 +240,6 @@ static void pgd_mop_up_pmds(struct mm_struct *mm, pgd_t *pgdp)
>  static void pgd_prepopulate_pmd(struct mm_struct *mm, pgd_t *pgd, pmd_t *pmds[])
>  {
>  	pud_t *pud;
> -	unsigned long addr;
>  	int i;
>  
>  	if (PREALLOCATED_PMDS == 0) /* Work around gcc-3.4.x bug */
> @@ -248,8 +247,7 @@ static void pgd_prepopulate_pmd(struct mm_struct *mm, pgd_t *pgd, pmd_t *pmds[])
>  
>  	pud = pud_offset(pgd, 0);
>  
> - 	for (addr = i = 0; i < PREALLOCATED_PMDS;
> -	     i++, pud++, addr += PUD_SIZE) {
> +	for (i = 0; i < PREALLOCATED_PMDS; i++, pud++) {
>  		pmd_t *pmd = pmds[i];
>  
>  		if (i >= KERNEL_PGD_BOUNDARY)
> -- 
> 1.8.1.2
> 

-- 
Michal Hocko
SUSE Labs
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