Bug#609371: linux-image-2.6.37-trunk-sparc64: module scsi_mod: Unknown relocation: 36
- To: Sam Ravnborg <sam@ravnborg.org>
- Cc: David Miller <davem@davemloft.net>, rostedt@goodmis.org, richm@oldelvet.org.uk, 609371@bugs.debian.org, ben@decadent.org.uk, sparclinux@vger.kernel.org, linux-kernel@vger.kernel.org, fweisbec@gmail.com, mingo@redhat.com
- Subject: Bug#609371: linux-image-2.6.37-trunk-sparc64: module scsi_mod: Unknown relocation: 36
- From: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
- Date: Wed, 19 Jan 2011 11:18:57 -0500
- Message-id: <[🔎] 20110119161857.GC15031@Krystal>
- Reply-to: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>, 609371@bugs.debian.org
- In-reply-to: <[🔎] 20110119161455.GA18503@merkur.ravnborg.org>
- References: <[🔎] 20110118201323.GA14930@Krystal> <[🔎] 1295382144.12215.123.camel@gandalf.stny.rr.com> <[🔎] 20110119050844.GA8776@Krystal> <[🔎] 20110118.211639.68142725.davem@davemloft.net> <[🔎] 20110119151004.GA11022@Krystal> <[🔎] 20110119161455.GA18503@merkur.ravnborg.org>
* Sam Ravnborg (sam@ravnborg.org) wrote:
> >
> > If my memory serves me correctly, I think "long long" is aligned on 4 bytes on
> > ppc32, but on 8 bytes on x86_32 (yeah, that's weird). How about we create a
> > #define __long_long_aligned __attribute__((__aligned__(__alignof__(long long))))
>
> #define __u64_aligned __attribute__((__aligned__(__alignof__(long long))))
>
> A bit shorter but maybe less obvious.
Yep, that would make sense.
I'm tempted to try creating
#defined __u64_packed_aligned __attribute__((__packed__, __aligned__(__alignof__(long long))))
in the hope that gcc sees this as a strict alignment requirement (including a
max bound) rather than just a hint. From what I gather in my reading of
http://gcc.gnu.org/onlinedocs/gcc/Type-Attributes.html
"The aligned attribute can only increase the alignment; but you can decrease it
by specifying packed as well. See below."
gcc seems to support having both specified. I think this would provide the kind
of alignment guarantees we really need here: both specifying the minimum _and_
maximum alignment.
Thoughts ?
Mathieu
>
> Sam
--
Mathieu Desnoyers
Operating System Efficiency R&D Consultant
EfficiOS Inc.
http://www.efficios.com
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