Messages in this thread |  | | | Date | Thu, 19 Oct 2006 00:41:18 -0700 | | From | Andrew Morton <> | | 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@davemloft.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).
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