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

From: Suzuki K. Poulose
Date: Tue Aug 11 2015 - 11:37:53 EST

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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