Re: kern/50038: udl (DisplayLink GX-DVI_U2B) alignment fault on earmv6hf NETWALKER

[Martin Husemann <martin%duskware.de@localhost>]

The following reply was made to PR kern/50038; it has been noted by GNATS.

From: Martin Husemann <martin%duskware.de@localhost>
To: MOCHIDA Shuji <mochid%netside.co.jp@localhost>
Cc: skrll%netbsd.org@localhost, gnats-bugs%NetBSD.org@localhost, kern-bug-people%netbsd.org@localhost,
	gnats-admin%netbsd.org@localhost, netbsd-bugs%netbsd.org@localhost
Subject: Re: kern/50038: udl (DisplayLink GX-DVI_U2B) alignment fault on earmv6hf NETWALKER
Date: Thu, 10 Nov 2016 18:54:57 +0100

 On Thu, Nov 10, 2016 at 11:46:41PM +0900, MOCHIDA Shuji wrote:
 > Replace be32enc(), be16enc() to use !(GCC >= 2.95) version, then the device
 > works good.
 > Something wrong with __builtin_memcpy()? or compiler optimization?
 
 I don't see what is wrong with the source - sc->sc_cmd_buf is a uint8_t*
 passed directly as void* to the inline function, no bogus casts involved,
 so the compiler can not assume proper alignment.
 
 Maybe I am missing something, or it is a compiler bug.
 
 Martin