linux-kernel - Re: [PATCH] Revert "drm/i915: Performed deferred clflush inside set-cache-level"

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Date:	Mon, 13 Apr 2015 11:28:46 +0530
From:	Sudip Mukherjee <sudipm.mukherjee@...il.com>
To:	Chris Wilson <chris@...is-wilson.co.uk>,
	Daniel Vetter <daniel.vetter@...el.com>,
	Jani Nikula <jani.nikula@...ux.intel.com>,
	David Airlie <airlied@...ux.ie>,
	Ville Syrjälä 
	<ville.syrjala@...ux.intel.com>, huax.lu@...el.com,
	Daniel Vetter <daniel.vetter@...ll.ch>,
	intel-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Revert "drm/i915: Performed deferred clflush inside
 set-cache-level"

On Wed, Apr 01, 2015 at 10:01:50AM +0530, Sudip Mukherjee wrote:
> On Tue, Mar 31, 2015 at 04:35:49PM +0100, Chris Wilson wrote:
> > On Tue, Mar 31, 2015 at 08:40:12PM +0530, Sudip Mukherjee wrote:
> > > This reverts commit <0f71979ab7fbd0c71c41c2798de3d33937915434>.
> > > 
> > > my display was getting garbled for a moment very frequently. it looked
> > > like when the screen was getting refreshed then something was going
> > > wrong.
> > > git bisect gave this as the first bad commit, and after reverting it
> > > now display is not having that problem.
> > 
> > Hmm, I fear you would be just papering over a bug. Could you please file
> > a bug on bugs.freedesktop.org so that we can root cause this?
> > -Chris
> filed at https://bugs.freedesktop.org/show_bug.cgi?id=89857
> 
> since this patch workes perfectly for me, i guess i need to apply it to
> every new release till you are able to root cause and fix it.

I am having the same problem with v4.0 also. Though I guess there is
some improvement as now the problem is not appearing as frequently as
it used to be.
And reverting the patch again completely removed the problem.

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