linux-kernel - Re: [PATCH 3/3] arm64/fpsimd: Use ID_AA64PFR0_EL1

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Message-ID: <f0a6a6de-8a54-52d3-f0c6-773c43989eb7@arm.com>
Date:   Mon, 7 Nov 2016 16:31:16 +0000
From:   Suzuki K Poulose <Suzuki.Poulose@....com>
To:     Alexander Kuleshov <kuleshovmail@...il.com>,
        Catalin Marinas <Catalin.Marinas@....com>,
        Will Deacon <Will.Deacon@....com>
Cc:     "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/3] arm64/fpsimd: Use ID_AA64PFR0_EL1_.* macros

On 03/09/15 19:12, Alexander Kuleshov wrote:
> The 26d75e67c commit (arm64/cpufeature.h: Add macros for a cpu features
> testing) provides set of macros for the testing processor's FP and advanced
> SIMD features.
>
> Let's use these macros instead of direct calculation.
>
> Signed-off-by: Alexander Kuleshov <kuleshovmail@...il.com>
> ---
>  arch/arm64/kernel/fpsimd.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
>
> diff --git a/arch/arm64/kernel/fpsimd.c b/arch/arm64/kernel/fpsimd.c
> index 44d6f75..12943a5 100644
> --- a/arch/arm64/kernel/fpsimd.c
> +++ b/arch/arm64/kernel/fpsimd.c
> @@ -27,6 +27,7 @@
>
>  #include <asm/fpsimd.h>
>  #include <asm/cputype.h>
> +#include <asm/cpufeature.h>
>
>  #define FPEXC_IOF	(1 << 0)
>  #define FPEXC_DZF	(1 << 1)
> @@ -333,13 +334,13 @@ static int __init fpsimd_init(void)
>  {
>  	u64 pfr = read_cpuid(ID_AA64PFR0_EL1);
>
> -	if (pfr & (0xf << 16)) {
> +	if (ID_AA64PFR0_EL1_FP(pfr)) {
>  		pr_notice("Floating-point is not implemented\n");
>  		return 0;
>  	}
>  	elf_hwcap |= HWCAP_FP;
>
> -	if (pfr & (0xf << 20))
> +	if (ID_AA64PFR0_EL1_ADV_SIMD(pfr))
>  		pr_notice("Advanced SIMD is not implemented\n");
>  	else
>  		elf_hwcap |= HWCAP_ASIMD;
>

Similar to the previous one, this won't apply anymore.

Suzuki