linux-kernel - Re: [PATCH 0/6] generic relative extable support

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Date:	Mon, 4 Jan 2016 12:20:26 +0100
From:	Heiko Carstens <heiko.carstens@...ibm.com>
To:	Ard Biesheuvel <ard.biesheuvel@...aro.org>
Cc:	linux-alpha@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-ia64@...r.kernel.org,
	linux-s390@...r.kernel.org, x86@...nel.org, hpa@...or.com,
	mingo@...hat.com, schwidefsky@...ibm.com, mattst88@...il.com,
	ink@...assic.park.msu.ru, rth@...ddle.net, tony.luck@...el.com,
	fenghua.yu@...el.com, catalin.marinas@....com, will.deacon@....com,
	arnd@...db.de, akpm@...ux-foundation.org, mark.rutland@....com,
	marc.zyngier@....com
Subject: Re: [PATCH 0/6] generic relative extable support

On Sun, Jan 03, 2016 at 05:05:51PM +0100, Ard Biesheuvel wrote:
> There are currently four architectures (x86, ia64, alpha and s390) whose
> user-access exception tables are relative to the table entry address rather
> than absolute. Each of these architectures has its own search_extable() and
> sort_extable() implementation, which are not only mostly identical to each
> other, but also deviate very little from the generic absolute implementations
> in lib/extable.c that they override.
> 
> So before making arm64 the fifth architecture that reimplements this, let's
> refactor the existing code so that all of these architectures use common code
> for searching and sorting the relative extables. Archs may set
> ARCH_HAS_RELATIVE_EXTABLE to indicate that the table consists of a pair of
> relative ints, and may define swap_ex_entry_fixup() if the fixup member needs
> special treatment in the swapping step of the sorting routine (such as alpha).
> 
> Note that the s390 patch applies on top of the following patch:
> 
>   http://article.gmane.org/gmane.linux.kernel/2117036
> 
> which fixes a bug I spotted while working on this code. Since that probably
> needs to go to -stable, I broke it out and posted it separately.
> 
> Ard Biesheuvel (6):
>   extable: add support for relative extables to search and sort routines
>   alpha/extable: use generic search and sort routines
>   s390/extable: use generic search and sort routines
>   x86/extable: use generic search and sort routines
>   ia64/extable: use generic search and sort routines
>   arm64: switch to relative exception tables

For the s390 bits:

Acked-by: Heiko Carstens <heiko.carstens@...ibm.com>

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