linux-kernel - Re: [PATCH 1/1] x86/irq: Add hardcoded hypervisor interrupts to /proc/stat

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Message-ID: <dce372bd-e63c-f24c-5b79-1ef65fd1e59a@intel.com>
Date:   Wed, 22 Mar 2023 11:07:29 -0700
From:   Dave Hansen <dave.hansen@...el.com>
To:     Michael Kelley <mikelley@...rosoft.com>, tglx@...utronix.de,
        mingo@...hat.com, bp@...en8.de, dave.hansen@...ux.intel.com,
        hpa@...or.com, x86@...nel.org, linux-hyperv@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] x86/irq: Add hardcoded hypervisor interrupts to
 /proc/stat

On 2/27/23 10:46, Michael Kelley wrote:
> diff --git a/arch/x86/kernel/irq.c b/arch/x86/kernel/irq.c
> index 766ffe3..9f668d2 100644
> --- a/arch/x86/kernel/irq.c
> +++ b/arch/x86/kernel/irq.c
> @@ -211,6 +211,13 @@ u64 arch_irq_stat_cpu(unsigned int cpu)
>  #ifdef CONFIG_X86_MCE_THRESHOLD
>  	sum += irq_stats(cpu)->irq_threshold_count;
>  #endif
> +#ifdef CONFIG_X86_HV_CALLBACK_VECTOR
> +	sum += irq_stats(cpu)->irq_hv_callback_count;
> +#endif
> +#if IS_ENABLED(CONFIG_HYPERV)
> +	sum += irq_stats(cpu)->irq_hv_reenlightenment_count;
> +	sum += irq_stats(cpu)->hyperv_stimer0_count;
> +#endif
>  #ifdef CONFIG_X86_MCE
>  	sum += per_cpu(mce_exception_count, cpu);
>  	sum += per_cpu(mce_poll_count, cpu);

This seems fine, especially since arch_show_interrupts() has them.  But,
what's with the "#if IS_ENABLED" versus the plain #ifdef?  Is there some
difference I'm missing?  Why not just be consistent with the other code
and use a plain #ifdef for both?