Re: [RFC 1/3] powerpc: __copy_tofrom_user tweaked for Cell

Thu, 19 Jun 2008 09:19:59 -0700 


--- On Thu, 6/19/08, Gunnar von Boehn <[EMAIL PROTECTED]> wrote:

> You are right the main copy2user requires that the SRC is
> cacheable.
> IMHO because of the exception on load, the routine should
> fallback to the
> byte copy loop.
> 
> Arnd, could you verify that it works on localstore?

Since the main loops use 'dcbz', the destination must also be cacheable. IIRC, 
if the destination is write-through or cache-inhibited, the 'dcbz' will cause 
an alignment exception. I suppose it would still function correctly via the 
handler, but horribly slowly.

--Sanjay




      
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