linux-kernel - Re: [PATCH 0/4] A new selftests/ directory for arm compatibility testing

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Date: Fri, 5 Apr 2024 18:37:59 +0100
From: Mark Brown <broonie@...nel.org>
To: Dev Jain <dev.jain@....com>
Cc: shuah@...nel.org, linux-arm-kernel@...ts.infradead.org,
	linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org,
	Anshuman.Khandual@....com, suzuki.poulose@....com,
	ryan.roberts@....com, rob.herring@....com, Catalin.Marinas@....com,
	will@...nel.org, mark.rutland@....com,
	Russell King <linux@...linux.org.uk>
Subject: Re: [PATCH 0/4] A new selftests/ directory for arm compatibility
 testing

On Fri, Apr 05, 2024 at 02:14:06PM +0530, Dev Jain wrote:
> This series introduces the selftests/arm directory, which tests 32 and 64-bit
> kernel compatibility with 32-bit ELFs running on the Aarch platform.
> The need for this bucket of tests is that 32 bit applications built on legacy
> ARM architecture must not break on the new Aarch64 platforms and the 64-bit
> kernel. The kernel must emulate the data structures, system calls and the
> registers according to Aarch32, when running a 32-bit process; this directory
> fills that testing requirement.

You should copy Russell King, the 32 bit architeture maintainer, on this
- I've added him here.

FWIW it was me who suggested this work, like Dev says having some
coverage of the corners of the 32 bit ABI feels especially sensible for
arm64 since compat mode could relatively easily get accidentally broken
making changes for 64 bit.

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