linux-kernel - Re: [PATCH 1/3] mm: add comment for __mod_zone_page

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Date:	Mon, 12 May 2014 11:57:15 -0500 (CDT)
From:	Christoph Lameter <cl@...ux.com>
To:	Jianyu Zhan <nasa4836@...il.com>
cc:	akpm@...ux-foundation.org, riel@...hat.com, aarcange@...hat.com,
	oleg@...hat.com, cldu@...vell.com, fabf@...net.be,
	sasha.levin@...cle.com, zhangyanfei@...fujitsu.com,
	iamjoonsoo.kim@....com, n-horiguchi@...jp.nec.com,
	kirill.shutemov@...ux.intel.com, liwanp@...ux.vnet.ibm.com,
	gorcunov@...il.com, minchan@...nel.org,
	dave.hansen@...ux.intel.com, toshi.kani@...com,
	paul.gortmaker@...driver.com, srivatsa.bhat@...ux.vnet.ibm.com,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	Hugh Dickins <hughd@...gle.com>
Subject: Re: [PATCH 1/3] mm: add comment for __mod_zone_page_stat

On Tue, 13 May 2014, Jianyu Zhan wrote:

> diff --git a/mm/internal.h b/mm/internal.h
> index 07b6736..53d439e 100644
> --- a/mm/internal.h
> +++ b/mm/internal.h
> @@ -196,7 +196,12 @@ static inline int mlocked_vma_newpage(struct vm_area_struct *vma,
>  		return 0;
>
>  	if (!TestSetPageMlocked(page)) {
> -		mod_zone_page_state(page_zone(page), NR_MLOCK,
> +		/*
> +		 * We use the irq-unsafe __mod_zone_page_stat because
> +		 * this counter is not modified from interrupt context, and the
> +		 * pte lock is held(spinlock), which implies preemtion disabled.

Preemption is mis-spelled throughout.

Otherwise

Reviewed-by: Christoph Lameter <cl@...ux.com>

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