linux-kernel - Re: [PATCH -mm v2] mm: add page_check_address

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Message-ID: <20151124042941.GE705@swordfish>
Date:	Tue, 24 Nov 2015 13:29:41 +0900
From:	Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
To:	Vladimir Davydov <vdavydov@...tuozzo.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	"Kirill A. Shutemov" <kirill@...temov.name>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, sergey.senozhatsky.work@...il.com
Subject: Re: [PATCH -mm v2] mm: add page_check_address_transhuge helper

Hello,

On (11/20/15 12:31), Vladimir Davydov wrote:
[..]
> -	if (ptep_clear_flush_young_notify(vma, address, pte)) {
> -		/*
> -		 * Don't treat a reference through a sequentially read
> -		 * mapping as such.  If the page has been used in
> -		 * another mapping, we will catch it; if this other
> -		 * mapping is already gone, the unmap path will have
> -		 * set PG_referenced or activated the page.
> -		 */
> -		if (likely(!(vma->vm_flags & VM_SEQ_READ)))
> +	if (pte) {
> +		if (ptep_clear_flush_young_notify(vma, address, pte)) {
> +			/*
> +			 * Don't treat a reference through a sequentially read
> +			 * mapping as such.  If the page has been used in
> +			 * another mapping, we will catch it; if this other
> +			 * mapping is already gone, the unmap path will have
> +			 * set PG_referenced or activated the page.
> +			 */
> +			if (likely(!(vma->vm_flags & VM_SEQ_READ)))
> +				referenced++;
> +		}
> +		pte_unmap(pte);
> +	} else {
> +		if (pmdp_clear_flush_young_notify(vma, address, pmd))
>  			referenced++;
>  	}

# CONFIG_TRANSPARENT_HUGEPAGE is not set

x86_64, 4.4.0-rc2-mm1


mm/built-in.o: In function `page_referenced_one':
rmap.c:(.text+0x32070): undefined reference to `pmdp_clear_flush_young'


	-ss
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