[parisc-linux] Re: RFC: mmap patch

[Matthew Wilcox]

On Sat, Mar 08, 2003 at 03:02:14PM -0800, David S. Miller wrote:
>    One other difference you forgot is that Sparc64 has writethrough caches
>    and PA has writeback caches.  This can make a difference.
>    
> It certainly could, but I think sparc64's schemes will work.
> Please document any differences you discover, preferably with
> text to go into Documentation/cachetlb.txt

Well.. one patch which affected us, but wouldn't affect a writethrough
cache is:

http://ftp.linux.org.uk/pub/linux/willy/patches/applied/shmem.diff

In that situation, the user has no view of that page currently so they
will read from memory.  With a writethrough cache it works without the
flush_dcache_page(), with writeback it does not.

-- 
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victory, it is about death.  I've seen thousands and thousands of dead bodies.
Do you think I want to have an academic debate on this subject?" -- Robert Fisk