linux-kernel - Re: [PATCH v2] uapi/auxvec: Define AT_HWCAP3 and AT

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Date: Tue, 20 Feb 2024 23:53:58 +1100
From: Michael Ellerman <patch-notifications@...erman.id.au>
To: linux-api@...r.kernel.org, linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org, Peter Bergner <bergner@...ux.ibm.com>
Cc: Adhemerval Zanella <adhemerval.zanella@...aro.org>, Szabolcs Nagy <szabolcs.nagy@....com>, Nick Piggin <npiggin@....ibm.com>, Arnd Bergmann <arnd@...nel.org>
Subject: Re: [PATCH v2] uapi/auxvec: Define AT_HWCAP3 and AT_HWCAP4 aux vector, entries

On Wed, 14 Feb 2024 16:34:06 -0600, Peter Bergner wrote:
> Changes from v1:
> - Add Acked-by lines.
> 
> The powerpc toolchain keeps a copy of the HWCAP bit masks in our TCB for fast
> access by the __builtin_cpu_supports built-in function.  The TCB space for
> the HWCAP entries - which are created in pairs - is an ABI extension, so
> waiting to create the space for HWCAP3 and HWCAP4 until we need them is
> problematical.  Define AT_HWCAP3 and AT_HWCAP4 in the generic uapi header
> so they can be used in glibc to reserve space in the powerpc TCB for their
> future use.
> 
> [...]

Applied to powerpc/next.

[1/1] uapi/auxvec: Define AT_HWCAP3 and AT_HWCAP4 aux vector, entries
      https://git.kernel.org/powerpc/c/3281366a8e79a512956382885091565db1036b64

cheers