From mboxrd@z Thu Jan  1 00:00:00 1970
From: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Subject: Re: [PATCHv2, RFC 16/30] thp: handle file pages in split_huge_page()
Date: Thu, 28 Mar 2013 16:32:27 +0200 (EET)
Message-ID: <20130328143227.61B0CE0085@blue.fi.intel.com>
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 <514CA05D.6030302@sr71.net>
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Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
 Andrea Arcangeli <aarcange@redhat.com>,
 Andrew Morton <akpm@linux-foundation.org>,
 Al Viro <viro@zeniv.linux.org.uk>,
 Hugh Dickins <hughd@google.com>,
 Wu Fengguang <fengguang.wu@intel.com>,
 Jan Kara <jack@suse.cz>,
 Mel Gorman <mgorman@suse.de>,
 linux-mm@kvack.org,
 Andi Kleen <ak@linux.intel.com>,
 Matthew Wilcox <matthew.r.wilcox@intel.com>,
 "Kirill A. Shutemov" <kirill@shutemov.name>,
 Hillf Danton <dhillf@gmail.com>,
 linux-fsdevel@vger.kernel.org,
 linux-kernel@vger.kernel.org
To: Dave <dave@sr71.net>
Return-path: <owner-linux-mm@kvack.org>
In-Reply-To: <514CA05D.6030302@sr71.net>
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Dave wrote:
> On 03/14/2013 10:50 AM, Kirill A. Shutemov wrote:
> > +static int split_anon_huge_page(struct page *page)
> >  {
> >  	struct anon_vma *anon_vma;
> >  	int ret = 1;
> >  
> > -	BUG_ON(is_huge_zero_pfn(page_to_pfn(page)));
> > -	BUG_ON(!PageAnon(page));
> 
> Did you really mean to kill these BUG_ON()s?  They still look relevant
> to me.

The zero page BUG_ON() is moved to new split_huge_page().
!PageAnon(page) we now can handle.

Note: nobody should call split_anon_huge_page() directly, only
split_huge_page().

-- 
 Kirill A. Shutemov

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