[parisc-linux] Fwd: Problems with raw interface.

[Santosh Abraham]

The flush_dcache_page () might be required in cases when the
same user buffer is being used for both reads and writes in an
alternating fashion, right ?

-----Original Message-----
From: willy@www.linux.org.uk [mailto:willy@www.linux.org.uk]On Behalf Of
Matthew Wilcox
Sent: Friday, September 26, 2003 4:54 PM
To: David S. Miller
Cc: Matthew Wilcox; santosh.abraham@hp.com; randolph@tausq.org;
parisc-linux@lists.parisc-linux.org; sct@redhat.com
Subject: Re: [parisc-linux] Fwd: Problems with raw interface.


On Thu, Sep 25, 2003 at 06:08:48PM -0700, David S. Miller wrote:
> On Thu, 25 Sep 2003 15:26:23 +0100
> Matthew Wilcox <willy@debian.org> wrote:
>
> > I think you're right.  flush_dcache_page is for page cache pages, not
for
> > random user addresses.  Would something like this make sense?
>
> The flush_dcache_page() is needed in case the platform has deferred
> the flushing for a kernel cpu store to a page cache page.

But this isn't a page cache page.

> You cannot just delete this call and replace it with a flush_cache_range()
> call, that simply won't work.

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