linux-kernel - Re: [RFC PATCH 01/10] arm64: feature registers: Documentation

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Message-ID: <55CA16CA.8060609@arm.com>
Date:	Tue, 11 Aug 2015 16:37:46 +0100
From:	"Suzuki K. Poulose" <Suzuki.Poulose@....com>
To:	Catalin Marinas <catalin.marinas@....com>,
	Ard Biesheuvel <ard.biesheuvel@...aro.org>
CC:	Mark Rutland <Mark.Rutland@....com>,
	"aph@...hat.com" <aph@...hat.com>,
	Will Deacon <Will.Deacon@....com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"edward.nevill@...aro.org" <edward.nevill@...aro.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [RFC PATCH 01/10] arm64: feature registers: Documentation

On 11/08/15 15:23, Catalin Marinas wrote:
> On Mon, Aug 10, 2015 at 07:48:48PM +0200, Ard Biesheuvel wrote:
>>> On 10/08/15 17:06, Catalin Marinas wrote:
>>>> And to debunk some of the counter arguments:
>>>>
>>>> a) Running out of HWCAP bits - I really doubt this, we can always
>>>>      introduce 64 more via a new elf_hwcapX
>>
>> Note that ELF_HWCAP is also wired into ifunc resolution of GNU
>> indirect functions, which looks like a useful feature although it
>> isn't used that widely yet.
>
> I forgot to mention, we also need an HWCAP_CPUID with these patches when
> we expose the MRS interface. The ifunc resolver could use MRS when
> available. But I would still keep adding HWCAP bits for new features,
> even if we risk running out of the 64-bit we have now.
>

Sure, I will add the HWCAP_CPUID in the next version of the series.

Thanks
Suzuki

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