Re: [PATCH 1 of 4] mm: add a ptep_modify_prot transactionabstraction

[Benjamin Herrenschmidt]

On Wed, 2008-06-18 at 17:24 -0700, Linus Torvalds wrote:
> 
> On Wed, 18 Jun 2008, Jeremy Fitzhardinge wrote:
> >
> > Along the lines of:
> 
> Hell no. There's a reason we have a special set_wrprotect() thing. We can 
> do it more efficiently on native hardware by just clearing the bit 
> atomically. No need to do the cmpxchg games.

But we can't batch ... 

Ben.


--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/