Re: [PATCH 6/6] arm64: switch to relative exception tables
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- To: Ard Biesheuvel <ard.biesheuvel@xxxxxxxxxx>
- Subject: Re: [PATCH 6/6] arm64: switch to relative exception tables
- From: "Luck, Tony" <tony.luck@xxxxxxxxx>
- Date: Mon, 4 Jan 2016 11:49:26 -0800
- Cc: "H. Peter Anvin" <hpa@xxxxxxxxx>, Will Deacon <will.deacon@xxxxxxx>, "linux-alpha@xxxxxxxxxxxxxxx" <linux-alpha@xxxxxxxxxxxxxxx>, "linux-kernel@xxxxxxxxxxxxxxx" <linux-kernel@xxxxxxxxxxxxxxx>, "linux-arm-kernel@xxxxxxxxxxxxxxxxxxx" <linux-arm-kernel@xxxxxxxxxxxxxxxxxxx>, "linux-ia64@xxxxxxxxxxxxxxx" <linux-ia64@xxxxxxxxxxxxxxx>, "linux-s390@xxxxxxxxxxxxxxx" <linux-s390@xxxxxxxxxxxxxxx>, "x86@xxxxxxxxxx" <x86@xxxxxxxxxx>, "mingo@xxxxxxxxxx" <mingo@xxxxxxxxxx>, "heiko.carstens@xxxxxxxxxx" <heiko.carstens@xxxxxxxxxx>, "schwidefsky@xxxxxxxxxx" <schwidefsky@xxxxxxxxxx>, "mattst88@xxxxxxxxx" <mattst88@xxxxxxxxx>, "ink@xxxxxxxxxxxxxxxxxxxx" <ink@xxxxxxxxxxxxxxxxxxxx>, "rth@xxxxxxxxxxx" <rth@xxxxxxxxxxx>, "Yu, Fenghua" <fenghua.yu@xxxxxxxxx>, "catalin.marinas@xxxxxxx" <catalin.marinas@xxxxxxx>, "arnd@xxxxxxxx" <arnd@xxxxxxxx>, "akpm@xxxxxxxxxxxxxxxxxxxx" <akpm@xxxxxxxxxxxxxxxxxxxx>, "mark.rutland@xxxxxxx" <mark.rutland@xxxxxxx>, "marc.zyngier@xxxxxxx" <marc.zyngier@xxxxxxx>
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On Mon, Jan 04, 2016 at 08:28:52PM +0100, Ard Biesheuvel wrote:
> On 4 January 2016 at 20:21, H. Peter Anvin <hpa@xxxxxxxxx> 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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