Re: [Xen-devel] [PATCH] [media] ivtv: use arch_phys_wc_add() and require PAT disabled

2015-04-27 Thread Luis R. Rodriguez
On Sat, Apr 25, 2015 at 07:12:05AM -0400, Andy Walls wrote: Hi Luis, Sorry for the late reply. Thank you for the patch! See my comments below: On Wed, 2015-04-22 at 12:33 -0700, Luis R. Rodriguez wrote: From: Luis R. Rodriguez mcg...@suse.com We are burrying direct access to MTRR

Re: [Xen-devel] [PATCH] [media] ivtv: use arch_phys_wc_add() and require PAT disabled

2015-04-26 Thread Andy Walls
Hi Luis, Sorry for the late reply. Thank you for the patch! See my comments below: On Wed, 2015-04-22 at 12:33 -0700, Luis R. Rodriguez wrote: From: Luis R. Rodriguez mcg...@suse.com We are burrying direct access to MTRR code support on x86 in order to take advantage of PAT. In the future

[Xen-devel] [PATCH] [media] ivtv: use arch_phys_wc_add() and require PAT disabled

2015-04-22 Thread Luis R. Rodriguez
From: Luis R. Rodriguez mcg...@suse.com We are burrying direct access to MTRR code support on x86 in order to take advantage of PAT. In the future we also want to make the default behaviour of ioremap_nocache() to use strong UC, use of mtrr_add() on those systems would make write-combining void.