linux-kernel - Re: [PATCH] perf/x86/intel: use hexidecimal value for cpuid

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Message-ID: <ZAk67tyBMde8k1C5@debian-scheme>
Date:   Thu, 9 Mar 2023 09:48:30 +0800
From:   Zhenyu Wang <zhenyuw@...ux.intel.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Kan Liang <kan.liang@...ux.intel.com>
Subject: Re: [PATCH] perf/x86/intel: use hexidecimal value for cpuid

On 2023.03.08 15:16:19 +0100, Peter Zijlstra wrote:
> On Wed, Mar 08, 2023 at 11:15:01AM +0800, Zhenyu Wang wrote:
> > It's easier to use hexidecimal value instead of decimal for reading
> > and following with SDM doc, also align with other cpuid calls.
> 
> *shrug*..
> 
> > Signed-off-by: Zhenyu Wang <zhenyuw@...ux.intel.com>
> > ---
> >  arch/x86/events/intel/core.c | 2 +-
> >  arch/x86/events/intel/lbr.c  | 2 +-
> >  arch/x86/events/intel/pt.c   | 2 +-
> >  3 files changed, 3 insertions(+), 3 deletions(-)
> > 
> > diff --git a/arch/x86/events/intel/core.c b/arch/x86/events/intel/core.c
> > index 14f0a746257d..5af084198c8f 100644
> > --- a/arch/x86/events/intel/core.c
> > +++ b/arch/x86/events/intel/core.c
> > @@ -5903,7 +5903,7 @@ __init int intel_pmu_init(void)
> >  	 * Check whether the Architectural PerfMon supports
> >  	 * Branch Misses Retired hw_event or not.
> >  	 */
> > -	cpuid(10, &eax.full, &ebx.full, &fixed_mask, &edx.full);
> > +	cpuid(0xA, &eax.full, &ebx.full, &fixed_mask, &edx.full);
> >  	if (eax.split.mask_length < ARCH_PERFMON_EVENTS_COUNT)
> >  		return -ENODEV;
> 
> But now the data type names and the cpuid calls are no longer related.

oh, right, missed that. How about we change those too e.g union cpuid_0xa_eax?

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