Re: SysV IPC shared memory and virtual alising

[Dominic Sweetman <dom@algor.co.uk>]

Atsushi Nemoto (nemoto@toshiba-tops.co.jp) writes:

> 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.

Dominic Sweetman
Algorithmics Ltd