Re: SysV IPC shared memory and virtual alising

[Ralf Baechle <ralf@oss.sgi.com>]

On Mon, Aug 06, 2001 at 09:50:14AM +0100, Dominic Sweetman wrote:

> > Here is an patch to fix virtual aliasing problem with SysV IPC
> > shared memory.  I tested this patch on a r4k cpu with 32Kb D-cache.
> > 
> > If D-cache is smaller than PAGE_SIZE this patch is not needed at
> > all...
> 
> More precisely, if the size of a D-cache "set" is smaller than
> PAGE_SIZE.  So a CPU with a 16Kbyte 4-way set-associative cache and
> 4Kbyte PAGE_SIZE is safe.

Or is physically indexed and physically tagged or magically deals with
aliasing such as R4000 / R4400 SC and MC versions or R10000, R12000 or
R14000.

  Ralf