linux-kernel - Re: [PATCH v5 3/4] x86/smpboot: moves x86_topology to static initialize and truncate

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Message-ID: <20250711123523.GC905792@noisy.programming.kicks-ass.net>
Date: Fri, 11 Jul 2025 14:35:23 +0200
From: Peter Zijlstra <peterz@...radead.org>
To: Li Chen <me@...ux.beauty>
Cc: Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>,
	Borislav Petkov <bp@...en8.de>,
	Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
	"H . Peter Anvin" <hpa@...or.com>,
	"Rafael J . Wysocki" <rafael.j.wysocki@...el.com>,
	Sohil Mehta <sohil.mehta@...el.com>,
	Brian Gerst <brgerst@...il.com>,
	Patryk Wlazlyn <patryk.wlazlyn@...ux.intel.com>,
	linux-kernel@...r.kernel.org, Li Chen <chenl311@...natelecom.cn>,
	K Prateek Nayak <kprateek.nayak@....com>
Subject: Re: [PATCH v5 3/4] x86/smpboot: moves x86_topology to static
 initialize and truncate

On Thu, Jul 10, 2025 at 06:57:09PM +0800, Li Chen wrote:

> +		memset(&x86_topology[pkgdom], 0, sizeof(x86_topology[pkgdom]));

$ git grep "memset(&\([^,]*\), 0, sizeof(\1))" | wc -l
6439
$ git grep "memset(\([^,]*\), 0, sizeof(\*\1))" | wc -l
3319

But we don't have anything like:

#define zero_ref(var) memset(&(var), 0, sizeof(var))
#define zero_ptr(ptr) memset((ptr), 0, sizeof(*(ptr)))

Oh well..