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

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Date:	Mon, 30 Jul 2012 15:38:48 -0700
From:	Stephen Boyd <sboyd@...eaurora.org>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
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 07/30/12 14:56, Russell King - ARM Linux wrote:
> 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.
>

Thanks for the hint. I'm unfamiliar with how XIP works so I'll take a
closer look there.

-- 
Sent by an employee of the Qualcomm Innovation Center, Inc.
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum.

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