[RFC PATCH 01/10] arm64: feature registers: Documentation

Suzuki K. Poulose Suzuki.Poulose at arm.com
Tue Aug 11 08:37:46 PDT 2015

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.


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