linux-kernel - Re: [PATCH v2 4/7] arm64: cpufeature: Set the FP/SIMD compat HWCAP bits properly

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Date:   Fri, 10 Jan 2020 14:51:13 +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, mark.rutland@....com,
        dave.martin@....com, ard.biesheuvel@...aro.org,
        christoffer.dall@....com
Subject: Re: [PATCH v2 4/7] arm64: cpufeature: Set the FP/SIMD compat HWCAP
 bits properly

On Tue, Dec 17, 2019 at 06:33:59PM +0000, Suzuki K Poulose wrote:
> We set the compat_elf_hwcap bits unconditionally on arm64 to
> include the VFP and NEON support. However, the FP/SIMD unit
> is optional on Arm v8 and thus could be missing. We already
> handle this properly in the kernel, but still advertise to
> the COMPAT applications that the VFP is available. Fix this
> to make sure we only advertise when we really have them.
> 
> Fixes: 82e0191a1aa11abf ("arm64: Support systems without FP/ASIMD")
> Cc: Will Deacon <will@...nel.org>
> Cc: Catalin Marinas <catalin.marinas@....com>
> Cc: Mark Rutland <mark.rutland@....com>
> Signed-off-by: Suzuki K Poulose <suzuki.poulose@....com>

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