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Message-ID: <CA+55aFwDZHXf2FkWugCy4DF+mPTjxvjZH87ydhE5cuFFcJ-dJg@mail.gmail.com> Date: Thu, 6 Dec 2012 10:19:35 -0800 From: Linus Torvalds <torvalds@...ux-foundation.org> To: Mel Gorman <mgorman@...e.de> Cc: Jan Kara <jack@...e.cz>, Henrik Rydberg <rydberg@...omail.se>, 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() On Thu, Dec 6, 2012 at 9:55 AM, Mel Gorman <mgorman@...e.de> wrote: > > Yeah. I was listening to a talk while I was writing it, a bit cranky and > didn't see why I should suffer alone. Makes sense. > Quasimoto strikes again Is that Quasimodo's Japanese cousin? > - end_pfn = min(pfn + pageblock_nr_pages, zone_end_pfn); > + > + /* > + * As pfn may not start aligned, pfn+pageblock_nr_page > + * may cross a MAX_ORDER_NR_PAGES boundary and miss > + * a pfn_valid check. Ensure isolate_freepages_block() > + * only scans within a pageblock. > + */ > + end_pfn = ALIGN(pfn + pageblock_nr_pages, pageblock_nr_pages); > + end_pfn = min(end_pfn, end_pfn); Ok, this looks much nicer, except it's obviously buggy. The min(end_pfn, end_pfn) thing is insane, and I'm sure you meant for that line to be + end_pfn = min(end_pfn, zone_end_pfn); Henrik, does that - corrected - patch (*instead* of the previous one, not in addition to) also fix your issue? Linus -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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