linux-kernel - Re: Bug#609371: linux-image-2.6.37-trunk-sparc64: module scsi

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Date:	Wed, 19 Jan 2011 13:44:28 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	mathieu.desnoyers@...icios.com
Cc:	rostedt@...dmis.org, richm@...elvet.org.uk, 609371@...s.debian.org,
	ben@...adent.org.uk, sparclinux@...r.kernel.org,
	linux-kernel@...r.kernel.org, fweisbec@...il.com, mingo@...hat.com
Subject: Re: Bug#609371: linux-image-2.6.37-trunk-sparc64: module scsi_mod:
 Unknown relocation: 36

From: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Date: Wed, 19 Jan 2011 13:20:53 -0500

> Now what I'm discussing with David Miller is if creating a
> 
>   __long_packed_aligned
> 
> and using it for *both* type and variable alignment would be more palatable (it
> also works, and is more compact).

As I mentioned in another reply, we should not be using packed.

Packed has other implications, which makes it use byte-at-a-time accesses
for all parts of a structure when you tag it with 'packed'.  GCC doesn't
try to be clever and see that actually such accesses are safe.

If plain "__long_aligned" works and, since you're tagging it to the structure
definition, it only specifies a minimum-alignment, then I'm fine with using
that to fix this.
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