linux-kernel - Re: [PATCH v3 2/7] arm64: fpsimd: Make sure SVE setup is complete before SIMD is used

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Message-ID: <20200114115613.GC2289@mbp>
Date:   Tue, 14 Jan 2020 11:56:14 +0000
From:   Catalin Marinas <catalin.marinas@....com>
To:     Suzuki K Poulose <suzuki.poulose@....com>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        will@...nel.org, maz@...nel.org, ard.biesheuvel@...aro.org,
        mark.rutland@....com
Subject: Re: [PATCH v3 2/7] arm64: fpsimd: Make sure SVE setup is complete
 before SIMD is used

On Mon, Jan 13, 2020 at 11:30:18PM +0000, Suzuki K Poulose wrote:
> In-kernel users of NEON rely on may_use_simd() to check if the SIMD
> can be used. However, we must initialize the SVE before SIMD can
> be used. Add a sanity check to make sure that we have completed the
> SVE setup before anyone uses the SIMD.
> 
> Cc: Ard Biesheuvel <ard.biesheuvel@...aro.org>
> Cc: Mark Rutland <mark.rutland@....com>
> Cc: Will Deacon <will@...nel.org>
> Cc: Catalin Marinas <catalin.marinas@....com>
> Signed-off-by: Suzuki K Poulose <suzuki.poulose@....com>

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