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Message-ID: <BYAPR21MB16884B3D0E15E501A7BB8E78D7869@BYAPR21MB1688.namprd21.prod.outlook.com>
Date: Wed, 22 Mar 2023 19:52:21 +0000
From: "Michael Kelley (LINUX)" <mikelley@...rosoft.com>
To: Dave Hansen <dave.hansen@...el.com>,
"tglx@...utronix.de" <tglx@...utronix.de>,
"mingo@...hat.com" <mingo@...hat.com>,
"bp@...en8.de" <bp@...en8.de>,
"dave.hansen@...ux.intel.com" <dave.hansen@...ux.intel.com>,
"hpa@...or.com" <hpa@...or.com>, "x86@...nel.org" <x86@...nel.org>,
"linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH 1/1] x86/irq: Add hardcoded hypervisor interrupts to
/proc/stat
From: Dave Hansen <dave.hansen@...el.com> Sent: Wednesday, March 22, 2023 11:07 AM
>
> 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?
I'm following the coding pattern in arch_show_interrupts(), in irq_cpustat_t,
and most other places that test CONFIG_HYPERV. Maybe all those existing
cases are a mis-application of Documentation/process/coding-style.rst
Section 21, which prefers "if (IS_ENABLED(CONFIG_HYPERV))" over
"#ifdef CONFIG_HYPERV". "#if IS_ENABLED()" is not the same as
"if (IS_ENABLED())". :-)
Net, I don't have a strong preference either way.
Michael
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