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Date: Thu, 19 Oct 2006 00:41:18 -0700 From: Andrew Morton <akpm@...l.org> To: David Miller <davem@...emloft.net> Cc: dmonakhov@...nvz.org, linux-kernel@...r.kernel.org, linux-mm@...ck.org Subject: Re: [PATCH] mm:D-cache aliasing issue in cow_user_page On Thu, 19 Oct 2006 00:22:37 -0700 (PDT) David Miller <davem@...emloft.net> wrote: > > > Architectures typically take care of this in copy_user_page() and > > > clear_user_page(). The absolutely depend upon those two routines > > > being used for anonymous pages, and handle the D-cache issues there. > > > > Only anonymous pages? There are zillions of places where we modify > > pagecache without a flush, especially against the blockdev mapping (fs > > metadata). > > It's cpu stores that matter, not device DMA and the like, and we have > flush_dcache_page() calls in the correct spots. You can see that > we take care of this even in places such as the loop driver :-) grep b_data fs/*/*.c All of them ;) It's possible to mmap /dev/hda, but it's a rather odd thing to do (INND can do it, but not a live filesystem). - 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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