linux-kernel - Re: [patch V2 04/17] ARM: vdso: Compile high resolution parts conditionally

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Message-ID: <9e6dda40-66ee-f4cc-9931-da3bb832472c@arm.com>
Date:   Fri, 14 Feb 2020 11:55:28 +0000
From:   Vincenzo Frascino <vincenzo.frascino@....com>
To:     Thomas Gleixner <tglx@...utronix.de>,
        LKML <linux-kernel@...r.kernel.org>
Cc:     x86@...nel.org, John Stultz <john.stultz@...aro.org>,
        Andy Lutomirski <luto@...nel.org>,
        Christophe Leroy <christophe.leroy@....fr>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Juergen Gross <jgross@...e.com>,
        Michael Kelley <mikelley@...rosoft.com>,
        Sasha Levin <sashal@...nel.org>,
        Ralf Baechle <ralf@...ux-mips.org>,
        Paul Burton <paulburton@...nel.org>,
        James Hogan <jhogan@...nel.org>,
        Russell King <linux@...linux.org.uk>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Marc Zyngier <maz@...nel.org>, Andrei Vagin <avagin@...il.com>
Subject: Re: [patch V2 04/17] ARM: vdso: Compile high resolution parts
 conditionally

On 2/7/20 12:38 PM, Thomas Gleixner wrote:
> From: Thomas Gleixner <tglx@...utronix.de>
> 
> If the architected timer is disabled in the kernel configuration then let
> the core VDSO code drop the high resolution parts at compile time.
> 
> Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
>

Reviewed-by: Vincenzo Frascino <vincenzo.frascino@....com>
Tested-by: Vincenzo Frascino <vincenzo.frascino@....com>

> ---
>  arch/arm/include/asm/vdso/gettimeofday.h |    6 ++++++
>  1 file changed, 6 insertions(+)
> 
> --- a/arch/arm/include/asm/vdso/gettimeofday.h
> +++ b/arch/arm/include/asm/vdso/gettimeofday.h
> @@ -106,6 +106,12 @@ static __always_inline int clock_getres3
>  	return ret;
>  }
>  
> +static inline bool arm_vdso_hres_capable(void)
> +{
> +	return IS_ENABLED(CONFIG_ARM_ARCH_TIMER);
> +}
> +#define __arch_vdso_hres_capable arm_vdso_hres_capable
> +
>  static __always_inline u64 __arch_get_hw_counter(int clock_mode)
>  {
>  #ifdef CONFIG_ARM_ARCH_TIMER
> 

-- 
Regards,
Vincenzo