Re: [Qemu-devel] [PATCH 05/35] tcg-s390: Icache flush is a no-op.

[Aurelien Jarno]

On Thu, Jun 10, 2010 at 03:04:04PM -0700, Richard Henderson wrote:
> On 06/09/2010 03:55 PM, Aurelien Jarno wrote:
> > On Fri, Jun 04, 2010 at 12:14:13PM -0700, Richard Henderson wrote:
> >> Before gcc 4.2, __builtin___clear_cache doesn't exist, and
> >> afterward the gcc s390 backend implements it as nothing.
> > 
> > Does it means that instruction and data caches are coherent on s390?
> 
> Yes.
> 
> Principles of Operation, 2.1 Main storage:
> # Main storage may include a faster-access buffer storage, sometimes called a 
> cache.
> # Each CPU may have an associated cache. The effects, except on  performance, 
> of
> # the physical construction and the use of distinct storage media are not 
> observable
> # by the program.
> 
> This architecture pre-dates caches, I think.  ;-)

Ok, I have applied the patch

-- 
Aurelien Jarno                          GPG: 1024D/F1BCDB73
address@hidden                 http://www.aurel32.net