linux-kernel - Re: [PATCHv2 2/4] zsmalloc: use page->private instead of page->first

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Message-ID: <20150825171014.GA4881@node.dhcp.inet.fi>
Date:	Tue, 25 Aug 2015 20:10:14 +0300
From:	"Kirill A. Shutemov" <kirill@...temov.name>
To:	Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
Cc:	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Minchan Kim <minchan@...nel.org>,
	Hugh Dickins <hughd@...gle.com>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Dave Hansen <dave.hansen@...el.com>,
	Vlastimil Babka <vbabka@...e.cz>,
	Johannes Weiner <hannes@...xchg.org>,
	Michal Hocko <mhocko@...e.cz>,
	David Rientjes <rientjes@...gle.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Sergey Senozhatsky <sergey.senozhatsky@...il.com>
Subject: Re: [PATCHv2 2/4] zsmalloc: use page->private instead of
 page->first_page

On Tue, Aug 25, 2015 at 11:17:35AM +0900, Sergey Senozhatsky wrote:
> On (08/17/15 18:09), Kirill A. Shutemov wrote:
> [..]
> > @@ -980,7 +979,7 @@ static struct page *alloc_zspage(struct size_class *class, gfp_t flags)
> >  		if (i == 1)
> >  			set_page_private(first_page, (unsigned long)page);
> >  		if (i >= 1)
> > -			page->first_page = first_page;
> > +			set_page_private(first_page, (unsigned long)first_page);
> 
> This patch breaks zram/zsmalloc.
> 
> Shouldn't it be `page->private = first_page' instead of
> `first_page->private = first_page'? IOW:
> 
> -	set_page_private(first_page, (unsigned long)first_page);
> +	set_page_private(page, (unsigned long)first_page);
> 
> ?

Good catch. Thanks!

-- 
 Kirill A. Shutemov
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