linux-kernel - Re: [PATCH] arm64: extable: sort the exception table at build time

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Message-ID: <20130520094950.GG31359@mudshark.cambridge.arm.com>
Date:	Mon, 20 May 2013 10:49:50 +0100
From:	Will Deacon <will.deacon@....com>
To:	Sam Ravnborg <sam@...nborg.org>
Cc:	Catalin Marinas <Catalin.Marinas@....com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"david.daney@...ium.com" <david.daney@...ium.com>
Subject: Re: [PATCH] arm64: extable: sort the exception table at build time

On Fri, May 17, 2013 at 07:49:50PM +0100, Sam Ravnborg wrote:
> On Fri, May 17, 2013 at 05:43:41PM +0100, Will Deacon wrote:
> > +	. = ALIGN(8);
> > +	__ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) {
> > +		__start___ex_table = .;
> > +		*(__ex_table)
> > +		__stop___ex_table = .;
> > +	}
> 
> Here you could use:
>      EXCEPTION_TABLE(align)
> 
> (From include/asm-generic/vmlinux.lds.h)

Good spot, I'll spin a v2 using that. Looks like we don't use that for
arch/arm/ because we want to discard the section ifdef CONFIG_MMU. Maybe we
could change the generic macro to expand to nothing if !MMU, but I'm not
sure if other MMU-less architectures are playing tricks with this.

Will
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