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Date:   Wed, 23 Feb 2022 15:42:58 +0000
From:   Catalin Marinas <catalin.marinas@arm.com>
To:     Mark Brown <broonie@kernel.org>
Cc:     Will Deacon <will@kernel.org>, Marc Zyngier <maz@kernel.org>,
        Shuah Khan <skhan@linuxfoundation.org>,
        Shuah Khan <shuah@kernel.org>,
        Alan Hayward <alan.hayward@arm.com>,
        Luis Machado <luis.machado@arm.com>,
        Salil Akerkar <Salil.Akerkar@arm.com>,
        Basant Kumar Dwivedi <Basant.KumarDwivedi@arm.com>,
        Szabolcs Nagy <szabolcs.nagy@arm.com>,
        James Morse <james.morse@arm.com>,
        Alexandru Elisei <alexandru.elisei@arm.com>,
        Suzuki K Poulose <suzuki.poulose@arm.com>,
        linux-arm-kernel@lists.infradead.org,
        linux-kselftest@vger.kernel.org, kvmarm@lists.cs.columbia.edu
Subject: Re: [PATCH v11 32/40] kselftest/arm64: Add tests for TPIDR2
Message-ID: <YhZWAnLcBIqhHowG@arm.com>
References: <20220207152109.197566-1-broonie@kernel.org>
 <20220207152109.197566-33-broonie@kernel.org>
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On Mon, Feb 07, 2022 at 03:21:01PM +0000, Mark Brown wrote:
> The Scalable Matrix Extension adds a new system register TPIDR2 intended to
> be used by libc for its own thread specific use, add some kselftests which
> exercise the ABI for it.
> 
> Since this test should with some adjustment work for TPIDR and any other
> similar registers added in future add tests for it in a separate
> directory rather than placing it with the other floating point tests,
> nothing existing looked suitable so I created a new test directory
> called "abi".
> 
> Since this feature is intended to be used by libc the test is built as
> freestanding code using nolibc so we don't end up with the test program
> and libc both trying to manage the register simultaneously and
> distrupting each other. As a result of being written using nolibc rather
> than using hwcaps to identify if SME is available in the system we check
> for the default SME vector length configuration in proc, adding hwcap
> support to nolibc seems like disproportionate effort and didn't feel
> entirely idiomatic for what nolibc is trying to do.
> 
> Signed-off-by: Mark Brown <broonie@kernel.org>

Acked-by: Catalin Marinas <catalin.marinas@arm.com>