linux-kernel - Re: [PATCH 6/6] arm64: switch to relative exception tables

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Message-ID: <20160104194925.GA19213@agluck-desk.sc.intel.com>
Date:	Mon, 4 Jan 2016 11:49:26 -0800
From:	"Luck, Tony" <tony.luck@...el.com>
To:	Ard Biesheuvel <ard.biesheuvel@...aro.org>
Cc:	"H. Peter Anvin" <hpa@...or.com>,
	Will Deacon <will.deacon@....com>,
	"linux-alpha@...r.kernel.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" <linux-s390@...r.kernel.org>,
	"x86@...nel.org" <x86@...nel.org>,
	"mingo@...hat.com" <mingo@...hat.com>,
	"heiko.carstens@...ibm.com" <heiko.carstens@...ibm.com>,
	"schwidefsky@...ibm.com" <schwidefsky@...ibm.com>,
	"mattst88@...il.com" <mattst88@...il.com>,
	"ink@...assic.park.msu.ru" <ink@...assic.park.msu.ru>,
	"rth@...ddle.net" <rth@...ddle.net>,
	"Yu, Fenghua" <fenghua.yu@...el.com>,
	"catalin.marinas@....com" <catalin.marinas@....com>,
	"arnd@...db.de" <arnd@...db.de>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"mark.rutland@....com" <mark.rutland@....com>,
	"marc.zyngier@....com" <marc.zyngier@....com>
Subject: Re: [PATCH 6/6] arm64: switch to relative exception tables

On Mon, Jan 04, 2016 at 08:28:52PM +0100, Ard Biesheuvel wrote:
> On 4 January 2016 at 20:21, H. Peter Anvin <hpa@...or.com> wrote:
> > I suspect that means we will also need to go back to arch-specific
> > sorting for x86.
> >
> 
> AFAICT, Tony's patches are not incompatible with mine. The fixup
> address is offset with a large constant, but this does not affect the
> sort order (since that is based on the other member), and the swap
> operation that adds/subtracts the delta should not care about the
> class bits. (I don't see any changes to sort_extable() in Tony's
> patch)

Correct. Sorting is by the "insn" field (which I did not change).
The "fixup" field is just modified by an offset value, so survives
the math when moved to a new slot by the sort.

> @Tony: any comments? And do you have any objections to the ia64 patch
> in this series?
The ia64 bits look OK. I haven't tested, but add my Acked-by: anyway.

-Tony
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