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    SubjectRe: still nfs problems [Was: Linux 2.6.37-rc8]
    On Wed, 2011-01-05 at 13:08 -0800, Linus Torvalds wrote: 
    > On Wed, Jan 5, 2011 at 1:04 PM, Russell King - ARM Linux
    > <> wrote:
    > > On Wed, Jan 05, 2011 at 12:48:32PM -0800, Linus Torvalds wrote:
    > >> (You can also force the problem with vmalloc() an then following the
    > >> kernel page tables, but I hope nobody does that any more. I suspect
    > >> I'm wrong, though, there's probably code that mixes vmalloc and
    > >> physical page accesses in various drivers)
    > >
    > > Should vmalloc_to_page() (84 users)/vmalloc_to_pfn() (17 users) be
    > > deprecated then? ;)
    > I do think that the "modern" way of doing it is
    > "vmap()"/"vm_map_ram()" and friends, and it should be preferred over
    > using vmalloc() and then looking up the pages.
    > But in the end, the two approaches really are equivalent, so it's not
    > like it really matters. So I don't think we need to deprecate things
    > officially, but obviously we should make people more aware of the
    > whole virtual alias thing that crops up whenever you use any of these
    > approaches.

    So what should be the preferred way to ensure data gets flushed when
    you've written directly to a page, and then want to read through the
    vm_map_ram() virtual range? Should we be adding new semantics to

    Trond Myklebust
    Linux NFS client maintainer


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