linux-kernel - Re: [PATCH] allow placing exception table in .rodata (and do so on x86)

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Message-ID: <20110428104306.GC2431@osiris.boeblingen.de.ibm.com>
Date:	Thu, 28 Apr 2011 12:43:06 +0200
From:	Heiko Carstens <heiko.carstens@...ibm.com>
To:	Jan Beulich <JBeulich@...ell.com>
Cc:	mingo@...e.hu, tglx@...utronix.de, hpa@...or.com,
	linux-arch@...r.kernel.org, linux-kbuild@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] allow placing exception table in .rodata (and do so on
	 x86)

On Wed, Apr 27, 2011 at 04:36:04PM +0100, Jan Beulich wrote:
> This is since the table is really a set of pointers, i.e. misplaced in
> .text.
> 
> Quite likely other architectures would want to follow.
> 
> Signed-off-by: Jan Beulich <jbeulich@...ell.com>
> 

[...]

> --- 2.6.39-rc5/include/asm-generic/vmlinux.lds.h
> +++ 2.6.39-rc5-extable-in-rodata/include/asm-generic/vmlinux.lds.h
> @@ -226,6 +226,7 @@
>  		*(.rodata1)						\
>  	}								\
>  									\
> +	EXCEPTION_TABLE_RO						\

That's odd. The kernel actually writes to it (sort_main_extable()), so
it shouldn't be in the ro data section, but the data section.

>  	JUMP_TABLE							\

same here.
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