linux-kernel - Re: [PATCH] ARM: Sort exception table at compile time

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Message-ID: <20120730215617.GA10335@n2100.arm.linux.org.uk>
Date:	Mon, 30 Jul 2012 22:56:17 +0100
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Stephen Boyd <sboyd@...eaurora.org>
Cc:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	David Daney <david.daney@...ium.com>
Subject: Re: [PATCH] ARM: Sort exception table at compile time

On Mon, Jul 30, 2012 at 02:30:03PM -0700, Stephen Boyd wrote:
> Add the ARM machine identifier to sortextable and select the
> config option so that we can sort the exception table at compile
> time. sortextable relies on a section named __ex_table existing
> in the vmlinux, but ARM's linker script places the exception
> table in the data section. Give the exception table its own
> section so that sortextable can find it.
> 
> This allows us to skip the runtime sorting step during boot.
> 
> Signed-off-by: Stephen Boyd <sboyd@...eaurora.org>
> Cc: David Daney <david.daney@...ium.com>
> ---
> 
> I can't find any information on why the exception table lives in the data
> section. If there's a good reason for that, I'll look into changing
> sortextable to look for the __start___ex_table symbol.

Be careful about the placement of this, especially with XIP.

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