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Message-ID: <28c262360910160343m1cf8bbf3g527085f29e0ae868@mail.gmail.com> Date: Fri, 16 Oct 2009 19:43:20 +0900 From: Minchan Kim <minchan.kim@...il.com> To: Ralf Baechle <ralf@...ux-mips.org> Cc: Atsushi Nemoto <anemo@....ocn.ne.jp>, lkml <linux-kernel@...r.kernel.org>, linux-mips <linux-mips@...ux-mips.org>, Chungki woo <chungki.woo@...il.com> Subject: Re: BUG? linux-mips flush_dcache_page On Fri, Oct 16, 2009 at 6:24 PM, Ralf Baechle <ralf@...ux-mips.org> wrote: > On Fri, Oct 16, 2009 at 02:17:19PM +0900, Minchan Kim wrote: > >> Many code of kernel fs usually allocate high page and flush. >> But flush_dcache_page of mips checks PageHighMem to avoid flush >> so that data consistency is broken, I think. > > What processor and cache configuration? Chungki. Could you anwer this question ? >> I found it's by you and Atsushi-san on 585fa724. >> Why do we need the check? >> Could you elaborte please? > > The if statement exists because __flush_dcache_page would crash if a page > is not mapped. This of course isn't correct but that wasn't a problem > since highmem still is only supported on machines that don't have aliases. Thansk for good explanation. Chungki. Please let us know your machine(processor and cache configuration) > > Ralf > -- Kind regards, Minchan Kim -- 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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