Re: cache invalidation in modload

[Antti Kantee <pooka%cs.hut.fi@localhost>]

On Wed Jan 07 2009 at 20:44:19 +0000, Andrew Doran wrote:
> On Thu, Jan 01, 2009 at 08:35:41PM +0200, Antti Kantee wrote:
> 
> > Why is cache invalidation, i.e. kobj_machdep(), required after loading
> > a module?  The module loading code doesn't appear to do anything
> > magically mystically mythical which would require a flush.  The only
> > reason I could even begin to imagine was to flush the instruction cache.
> > But at least on x86 this is not required according to my interpretation
> > of the Intel manuals.
> 
> x86: the trace cache on the Pentium 4 does not snoop writes performed by
> remote CPUs.

There's always a "but"...  I added a few comments to the code.  thanks.