linux-kernel - Re: Oops in 3.7-rc8 isolate_free_pages

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Message-ID: <CA+55aFy4Lv+_aPEakOJNR2F9PR=09jviT6Z70_NkWV5bSH5ABw@mail.gmail.com>
Date:	Thu, 6 Dec 2012 11:38:47 -0800
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Henrik Rydberg <rydberg@...omail.se>
Cc:	Mel Gorman <mgorman@...e.de>, Jan Kara <jack@...e.cz>,
	linux-mm <linux-mm@...ck.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Oops in 3.7-rc8 isolate_free_pages_block()

Ok, I've applied the patch.

Mel, some grepping shows that there is an old line that does

    end_pfn = ALIGN(low_pfn + pageblock_nr_pages, pageblock_nr_pages);

which looks bogus. That should probably also use "+ 1" instead. But
I'll consider that an independent issue, so I applied the one patch
regardless.

There is also a

    low_pfn += pageblock_nr_pages;
    low_pfn = ALIGN(low_pfn, pageblock_nr_pages) - 1;

that looks suspicious for similar reasons. Maybe

    low_pfn = ALIGN(low_pfn + 1, pageblock_nr_pages) - 1;

instead? Although that *can* result in the same low_pfn in the end, so
maybe that one was correct after all? I just did some grepping, no
actual semantic analysis...

                  Linus
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