[parisc-linux] Re: Problems with kernel mmap (failing tst-mmap-eofsync in glibc on parisc)

[Russell King]

On Fri, Aug 22, 2003 at 05:34:29PM +0100, Matthew Wilcox wrote:
> On Fri, Aug 22, 2003 at 09:14:47AM -0700, David S. Miller wrote:
> > On 22 Aug 2003 09:40:37 -0500
> > James Bottomley <James.Bottomley@SteelEye.com> wrote:
> > > The reason this doesn't happen is because the mapping is not on the
> > > mmap_shared list that flush_dcache_page() updates.
> > 
> > flush_dcache_page() checks both the shared and non-shared mmap lists,
> > so if it is on _either_ list it is flushed.  It does not check only
> > the shared list.

Eww.

> Gah, that's going to get really inefficient.  I still think we want to
> split flush_dcache_page() into two operations -- flush_dcache_user() and
> flush_dcache_kernel().  flush_dcache_user() would flush this specific
> user mapping back to ram and flush_dcache_kernel() would flush the
> kernel mapping.

Where are you proposing calling only _user() and _kernel() from ?

-- 
Russell King (rmk@arm.linux.org.uk)                The developer of ARM Linux
             http://www.arm.linux.org.uk/personal/aboutme.html