linux-kernel - Re: [PATCH RFC 1/5] scripts: Add sortextable to sort the kernel's exception table.

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Date:	Mon, 21 Nov 2011 10:25:36 -0800
From:	David Daney <ddaney.cavm@...il.com>
To:	Mike Frysinger <vapier@...too.org>
CC:	linux-mips@...ux-mips.org, ralf@...ux-mips.org,
	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
	linux-embedded@...r.kernel.org, x86@...nel.org,
	David Daney <david.daney@...ium.com>
Subject: Re: [PATCH RFC 1/5] scripts: Add sortextable to sort the kernel's
 exception table.

On 11/20/2011 03:22 PM, Mike Frysinger wrote:
> On Friday 18 November 2011 14:37:44 David Daney wrote:
>> --- /dev/null
>> +++ b/scripts/sortextable.c
>>
>> +/*
>> + * sortextable.c: Sort the kernel's exception table
>> + *
>> + * Copyright 2011 Cavium, Inc.
>> + *
>> + * Based on code taken from recortmcount.c which is:
>
> seems like it'd be nice if the duplicate helper funcs were placed in a common
> header file rather than copying&  pasting between them.
>

Yes, I may try to factor out some common code if we decide to move 
forward with the patch set.


>> +	switch (w2(ehdr->e_machine)) {
>> +	default:
>> +		fprintf(stderr, "unrecognized e_machine %d %s\n",
>> +			w2(ehdr->e_machine), fname);
>> +		fail_file();
>> +		break;
>> +	case EM_386:
>> +	case EM_MIPS:
>> +	case EM_X86_64:
>> +		break;
>> +	}  /* end switch */
>
> unlike recordmcount, this file doesn't do anything arch specific.  so let's just
> delete this and be done.

Not really true at this point.  We don't know the size or layout of the 
architecture specific exception table entries, likewise for 
CONFIG_ARCH_HAS_SORT_EXTABLE, we don't even know how to do the comparison.

I was trying to be a little conservative and only apply the build time 
sort to configurations that I could test.

David Daney
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