lkml.org 
[lkml]   [2018]   [Oct]   [16]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
Date
SubjectRe: [PATCH 1/2] ARM: copypage-fa: add kto and kfrom to input operands list
On Tue, Oct 16, 2018 at 10:44 AM Russell King - ARM Linux
<linux@armlinux.org.uk> wrote:
> On Tue, Oct 16, 2018 at 10:00:19AM +0200, Linus Walleij wrote:

> > I am on deep waters with ARM assembly, admittedly. So I wanted to
> > ask: OpenWRT has this cache patch:
> > https://github.com/openwrt/openwrt/blob/master/target/linux/gemini/patches-4.14/0001-cache-patch-from-OpenWRT.patch
> > I do not know why (sorry).
> >
> > Do you think that patch is actually a hack to hide the problem
> > fixed with this patch? (OK maybe stupid question but...)
>
> No, it looks to me like a hack to make DMA cache handling "more
> efficient" by cleaning/invalidating the entire cache when dealing
> with large streaming buffers.

Aha that makes a lot of sense.

I will attempt to drop it from OpenWRT in the next kernel upgrade
unless benchmarks can show that it is worth it.

Thanks Russell!

Linus Walleij

\
 
 \ /
  Last update: 2018-10-16 13:36    [W:0.995 / U:0.712 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site