Re: kern/54486: athn driver panics on arm

[Rin Okuyama <rokuyama%meiji.ac.jp@localhost>]

The following reply was made to PR kern/54486; it has been noted by GNATS.

From: Rin Okuyama <rokuyama%meiji.ac.jp@localhost>
To: Nick Hudson <nick.hudson%gmx.co.uk@localhost>, matthew green <mrg%eterna.com.au@localhost>,
	Andreas Gustafsson <gson%gson.org@localhost>
Cc: Christos Zoulas <christos%astron.com@localhost>, "maya%NetBSD.org@localhost"
	<maya%NetBSD.org@localhost>, "gnats-bugs%netbsd.org@localhost" <gnats-bugs%netbsd.org@localhost>
Subject: Re: kern/54486: athn driver panics on arm
Date: Mon, 26 Aug 2019 16:53:17 +0000

 On 2019/08/25 16:54, Nick Hudson wrote:
 > My focus is elsewhere at the moment, so feel free to apply the workaround=
 .
 
 I see. I will commit the workaround soon.
 
 > Perhaps we can compile a handful of drivers with -mno-unaligned-access
 > and not the whole kernel?
 
 Well, but it is difficult to make sure which components access
 DMA buffers and which do not. I prefer to forbid whole kernel to
 unaligned access. The affect on performance is, anyway, negligibly
 small as far as I can see; some lazy ``benchmark'' of building
 lang/perl shows only 0.1% difference between kernels with and
 without -mno-unaligned-access:
 
 http://mail-index.netbsd.org/port-arm/2019/01/07/msg005371.html
 
 If there's no objection, I will also send pull-up request for
 netbsd-9 in few days.
 
 Thanks,
 rin