linux-kernel - Re: [RFC v1 0/8] x86/init: Linux linker tables

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Message-ID: <56A27DB0.4090706@zytor.com>
Date:	Fri, 22 Jan 2016 11:06:24 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Michael Matz <matz@...e.de>
CC:	"Luis R. Rodriguez" <mcgrof@...e.com>,
	"Luis R. Rodriguez" <mcgrof@...not-panic.com>, tglx@...utronix.de,
	mingo@...hat.com, bp@...en8.de, konrad.wilk@...cle.com,
	rusty@...tcorp.com.au, luto@...capital.net,
	boris.ostrovsky@...cle.com, mcb30@...e.org, jgross@...e.com,
	JBeulich@...e.com, joro@...tes.org, ryabinin.a.a@...il.com,
	andreyknvl@...gle.com, long.wanglong@...wei.com,
	qiuxishi@...wei.com, aryabinin@...tuozzo.com,
	mchehab@....samsung.com, valentinrothberg@...il.com,
	peter.senna@...il.com, x86@...nel.org,
	Michal Marek <mmarek@...e.com>, xen-devel@...ts.xensource.com,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC v1 0/8] x86/init: Linux linker tables

On 01/22/2016 05:44 AM, Michael Matz wrote:
> Hi,
> 
> On Thu, 21 Jan 2016, H. Peter Anvin wrote:
> 
>> Something that confuses me is that gcc seems to give these sections the 
>> "aw" attributes which makes as complain.  This might be a gcc bug.
> 
> Workaround: use an (possibly empty) intializer:
> 
> struct foo {int i;};
> const struct foo
> __attribute__((used,section(".rodata.tbl.tablename.0"))) tablename[0] = {};
> 

And indeed that works.  Awesome!  Much better than having to do an
assembly hack.

	-hpa