On Wed, Aug 27, 2014 at 11:46:53AM +0100, Catalin Marinas wrote: > On Thu, Aug 21, 2014 at 04:43:28PM +0100, Steve Capper wrote: > > We need a mechanism to tag ptes as being special, this indicates that > > no attempt should be made to access the underlying struct page * > > associated with the pte. This is used by the fast_gup when operating on > > ptes as it has no means to access VMAs (that also contain this > > information) locklessly. > > > > The L_PTE_SPECIAL bit is already allocated for LPAE, this patch modifies > > pte_special and pte_mkspecial to make use of it, and defines > > __HAVE_ARCH_PTE_SPECIAL. > > > > This patch also excludes special ptes from the icache/dcache sync logic. > > > > Signed-off-by: Steve Capper <steve.capper@xxxxxxxxxx> > > Reviewed-by: Catalin Marinas <catalin.marinas@xxxxxxx> Thanks Catalin, I've added this to the patch. -- Steve > -- > To unsubscribe from this list: send the line "unsubscribe linux-arch" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>