linux-kernel - Re: [PATCH RFC v2 0/2] arm64: Add infrastructure for use of AT

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Message-Id: <172918775909.3620066.7512436802272338661.b4-ty@arm.com>
Date: Thu, 17 Oct 2024 18:58:13 +0100
From: Catalin Marinas <catalin.marinas@....com>
To: 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>,
	Will Deacon <will@...nel.org>,
	Jonathan Corbet <corbet@....net>,
	Mark Brown <broonie@...nel.org>
Cc: 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 0/2] arm64: Add infrastructure for use of AT_HWCAP3

On Fri, 04 Oct 2024 21:26:28 +0100, Mark Brown wrote:
> Since arm64 has now used all of AT_HWCAP2 it needs to either start using
> AT_HWCAP3 (which was recently added for PowerPC) or start allocating
> bits 32..61 of AT_HWCAP first.  Those are documented in elf_hwcaps.rst
> as unused and in uapi/asm/hwcap.h as unallocated for potential use by
> libc, glibc does currently use bits 62 and 63.  This series has the code
> for enabling AT_HWCAP3 as a reference.
> 
> [...]

Applied to arm64 (for-next/hwcap3), thanks! I decided to queue this now
as we seem to burn through about 15 hwcaps at a time with features like
dpISA. It gives libcs out there a bit of time to wire it up.

[1/2] binfmt_elf: Wire up AT_HWCAP3 at AT_HWCAP4
      https://git.kernel.org/arm64/c/4e6e8c2b757f
[2/2] arm64: Support AT_HWCAP3
      https://git.kernel.org/arm64/c/ddadbcdaaed5

-- 
Catalin