linux-kernel - Re: [PATCH RFC v2 2/2] arm64: Support AT

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Message-ID: <ZwUDmYbXNMede2Ui@finisterre.sirena.org.uk>
Date: Tue, 8 Oct 2024 11:04:09 +0100
From: Mark Brown <broonie@...nel.org>
To: Anshuman Khandual <anshuman.khandual@....com>
Cc: Alexander Viro <viro@...iv.linux.org.uk>,
	Christian Brauner <brauner@...nel.org>, Jan Kara <jack@...e.cz>,
	Eric Biederman <ebiederm@...ssion.com>, Kees Cook <kees@...nel.org>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will@...nel.org>, Jonathan Corbet <corbet@....net>,
	linux-fsdevel@...r.kernel.org, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	Yury Khrustalev <yury.khrustalev@....com>,
	Wilco Dijkstra <wilco.dijkstra@....com>,
	linux-arm-kernel@...ts.infradead.org, linux-doc@...r.kernel.org
Subject: Re: [PATCH RFC v2 2/2] arm64: Support AT_HWCAP3

On Tue, Oct 08, 2024 at 12:45:42PM +0530, Anshuman Khandual wrote:
> On 10/5/24 01:56, Mark Brown wrote:

> > +unsigned long cpu_get_elf_hwcap3(void)
> > +{
> > +	return elf_hwcap[2];
> > +}
> > +
> >  static void __init setup_boot_cpu_capabilities(void)
> >  {
> >  	/*

> LGTM, but just curious do you have a upcoming feature to be added
> in AT_HWCAP3 soon ?

We've filled AT_HWCAP2 already and are starting on the free bits in
AT_HWCAP, there's only 29 of those remaining and we get things like the
dpISA releases often burning through 15 at a time.  Like the cover says
it's not a pressing issue at this minute but whenever it does become a
pressing issue there's likely to be multiple extensions in flight and
it'll help not to have them all trying to carry the same serieses.

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