linux-kernel - Re: [PATCH v2 0/6] generic relative extable support

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Message-ID: <CAKv+Gu_qJESX1iafST2M-dqP1nx2Y+bHt6TPXL2sb6ZoSq-yYw@mail.gmail.com>
Date:	Fri, 15 Jan 2016 10:59:36 +0100
From:	Ard Biesheuvel <ard.biesheuvel@...aro.org>
To:	Heiko Carstens <heiko.carstens@...ibm.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-alpha@...r.kernel.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-ia64@...r.kernel.org" <linux-ia64@...r.kernel.org>,
	linux-s390@...r.kernel.org, "x86@...nel.org" <x86@...nel.org>,
	"hpa@...or.com" <hpa@...or.com>,
	"mingo@...hat.com" <mingo@...hat.com>, schwidefsky@...ibm.com,
	Matt Turner <mattst88@...il.com>, ink@...assic.park.msu.ru,
	Richard Henderson <rth@...ddle.net>,
	Tony Luck <tony.luck@...el.com>,
	"Yu, Fenghua" <fenghua.yu@...el.com>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>,
	Arnd Bergmann <arnd@...db.de>, Helge Deller <deller@....de>,
	Mark Rutland <mark.rutland@....com>
Subject: Re: [PATCH v2 0/6] generic relative extable support

On 14 January 2016 at 08:57, Heiko Carstens <heiko.carstens@...ibm.com> wrote:
> On Mon, Jan 11, 2016 at 02:59:46PM +0100, Ard Biesheuvel wrote:
>> On 5 January 2016 at 16:19, Ard Biesheuvel <ard.biesheuvel@...aro.org> 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).
>> >
>>
>> [...]
>>
>> Now that I have collected acks for all the patches, I think this is
>> good to go in.
>>
>> @Andrew: since this touches 5 different architectures, is this perhaps
>> something that could go in via your tree after -rc1?
>> (assuming that the s390 bugfix has been merged by then)
>
> Your s390 bugfix has been merged.  See git commit id bcb7825a77f4 ("s390:
> fix normalization bug in exception table sorting").
>

Thanks for the head's up.