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Re: [XenPPC] Re: [Xen-devel] [PATCH 1/2] [xencomm, linux] linux xencomm

To: Isaku Yamahata <yamahata@xxxxxxxxxxxxx>
Subject: Re: [XenPPC] Re: [Xen-devel] [PATCH 1/2] [xencomm, linux] linux xencomm consolidation
From: Hollis Blanchard <hollisb@xxxxxxxxxx>
Date: Fri, 10 Aug 2007 10:59:29 -0500
Cc: xen-ia64-devel@xxxxxxxxxxxxxxxxxxx, xen-devel@xxxxxxxxxxxxxxxxxxx, xen-ppc-devel <xen-ppc-devel@xxxxxxxxxxxxxxxxxxx>
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Reply-to: Hollis Blanchard <hollisb@xxxxxxxxxx>
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On Fri, 2007-08-10 at 15:59 +0900, Isaku Yamahata wrote:
> On Tue, Aug 07, 2007 at 05:48:54PM +0900, Isaku Yamahata wrote:
> >   - add gcc bug work around. gcc 4.1.2 on ia64 doesn't handle
> >     properly auto variables with align attribute.
> I thought this gcc issue was ia64 specific at first.
> But it seems to be generic (non-arch specific) issue.
> http://gcc.gnu.org/bugzilla/show_bug.cgi?id=16660
> (The patch exists, but it doesn't seem to be included in the main line yet.)
> Does the current xencomm_map_no_alloc() work on powerpc properly?
> At least my powerpc64-linux-gcc (gcc 4.1.1) doesn't seem to support
> __attribute__((aligned(32))) on stack variables.

Hmm, the bug includes a comment that says "If the code is not very
complex, the alignment appears to work," so I guess we've just been
getting lucky...

Hollis Blanchard
IBM Linux Technology Center

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