lkml.org 
[lkml]   [2015]   [Apr]   [21]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH v4 2/2] IB/qib: use arch_phys_wc_add()
On Tue, Apr 21, 2015 at 02:50:35PM -0700, Luis R. Rodriguez wrote:
> - if (qib_wc_pat) {
> - resource_size_t vl15off;
> - /*
> - * We do not set WC on the VL15 buffers to avoid
> - * a rare problem with unaligned writes from
> - * interrupt-flushed store buffers, so we need
> - * to map those separately here. We can't solve
> - * this for the rarely used mtrr case.
> - */
> - ret = init_chip_wc_pat(dd, 0);
> - if (ret)
> - goto bail;
> + /*
> + * We do not set WC on the VL15 buffers to avoid
> + * a rare problem with unaligned writes from
> + * interrupt-flushed store buffers, so we need
> + * to map those separately here. We can't solve
> + * this for the rarely used mtrr case.
> + */

This is a small change in behavior, but it doesn't seem important..

Mike, what do you think about adding:

if (dd->wc_cookie)
dev_err(.., "Using this device without CPU PAT support is known to be broken");

or similar..

Jason


\
 
 \ /
  Last update: 2015-04-22 00:41    [W:0.088 / U:0.928 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site