linux-kernel - Re: [PATCH 02/20] perf/x86/intel: Fix ARCH_PERFMON_NUM_COUNTER

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Message-ID: <20250127212901.GB9557@noisy.programming.kicks-ass.net>
Date: Mon, 27 Jan 2025 22:29:01 +0100
From: Peter Zijlstra <peterz@...radead.org>
To: "Liang, Kan" <kan.liang@...ux.intel.com>
Cc: Dapeng Mi <dapeng1.mi@...ux.intel.com>, Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Namhyung Kim <namhyung@...nel.org>, Ian Rogers <irogers@...gle.com>,
	Adrian Hunter <adrian.hunter@...el.com>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	Andi Kleen <ak@...ux.intel.com>,
	Eranian Stephane <eranian@...gle.com>, linux-kernel@...r.kernel.org,
	linux-perf-users@...r.kernel.org, Dapeng Mi <dapeng1.mi@...el.com>,
	stable@...r.kernel.org
Subject: Re: [PATCH 02/20] perf/x86/intel: Fix ARCH_PERFMON_NUM_COUNTER_LEAF

On Mon, Jan 27, 2025 at 11:43:53AM -0500, Liang, Kan wrote:

> But they are used for a 64-bit register.
> The ARCH_PERFMON_NUM_COUNTER_LEAF is for the CPUID enumeration, which is
> a u32.

A well, but CPUID should be using unions, no?

we have cpuid10_e[abd]x cpuid28_e[abc]x, so wheres cpuid23_e?x at?