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

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Message-ID: <20160121213732.GG15622@localhost.localdomain>
Date:	Thu, 21 Jan 2016 16:37:33 -0500
From:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To:	"Luis R. Rodriguez" <mcgrof@...e.com>
Cc:	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Andy Lutomirski <luto@...capital.net>,
	Boris Ostrovsky <boris.ostrovsky@...cle.com>, mcb30@...e.org,
	Juergen Gross <jgross@...e.com>,
	Jan Beulich <JBeulich@...e.com>, joro@...tes.org,
	Andrey Ryabinin <ryabinin.a.a@...il.com>,
	andreyknvl@...gle.com, long.wanglong@...wei.com,
	qiuxishi@...wei.com, aryabinin@...tuozzo.com,
	Mauro Carvalho Chehab <mchehab@....samsung.com>,
	Valentin Rothberg <valentinrothberg@...il.com>,
	Peter Senna Tschudin <peter.senna@...il.com>,
	X86 ML <x86@...nel.org>, Michal Marek <mmarek@...e.com>,
	"xen-devel@...ts.xensource.com" <xen-devel@...ts.xensource.com>,
	Michael Matz <matz@...e.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [RFC v1 0/8] x86/init: Linux linker tables

On Thu, Jan 21, 2016 at 12:33:43PM -0800, Luis R. Rodriguez wrote:
> On Thu, Jan 21, 2016 at 12:19 PM, H. Peter Anvin <hpa@...or.com> wrote:
> > On 12/17/15 20:40, H. Peter Anvin wrote:
> >>>
> >>> const struct
> >>> foo__attribute__((used,section(".rodata.tbl.tablename.0"))) tablename[0];
> >>>
> >>> const struct
> >>> foo__attribute__((used,section(".rodata.tbl.tablename.999")))
> >>> tablename__end[0];
> >>>
> >
> > (Over)thinking about this some more, I suggest using the empty string
> > for the start and "~" for the end.  And, yes, I did check that ~ works
> > as part of a section name.
> 
> Sure, do we know if that ICC compatible? Do we care? There are a
> series of ICC hacks put in place on ipxe's original solution which
> I've folded in, it seems that works but if we care about ICC those
> folks should perhaps help review as well.

I didn't know the kernel could even be compiled with ICC? Thought
only GCC worked?

Anyhow - it may be that those fixes were for quite old ICC versions.
Does the latest one manifest these oddities?

> 
> > 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.
> > Worst case we have to use an assembly statement to create these
> > sections; it isn't a big deal and shouldn't make it any more
> > architecture-specific.
> 
> OK!
> 
>  Luis