linux-kernel - Re: [PATCH 01/16] x86/tsc: Add a standalone helpers for getting TSC info from CPUID.0x15

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Message-ID: <20250211184021.GFZ6uZlZWPVTI5qO1_@fat_crate.local>
Date: Tue, 11 Feb 2025 19:40:21 +0100
From: Borislav Petkov <bp@...en8.de>
To: Sean Christopherson <seanjc@...gle.com>
Cc: Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>,
	Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Juergen Gross <jgross@...e.com>,
	"K. Y. Srinivasan" <kys@...rosoft.com>,
	Haiyang Zhang <haiyangz@...rosoft.com>,
	Wei Liu <wei.liu@...nel.org>, Dexuan Cui <decui@...rosoft.com>,
	Ajay Kaher <ajay.kaher@...adcom.com>,
	Alexey Makhalov <alexey.amakhalov@...adcom.com>,
	Jan Kiszka <jan.kiszka@...mens.com>,
	Paolo Bonzini <pbonzini@...hat.com>,
	Andy Lutomirski <luto@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>, linux-kernel@...r.kernel.org,
	linux-coco@...ts.linux.dev, virtualization@...ts.linux.dev,
	linux-hyperv@...r.kernel.org, jailhouse-dev@...glegroups.com,
	kvm@...r.kernel.org, xen-devel@...ts.xenproject.org,
	Nikunj A Dadhania <nikunj@....com>,
	Tom Lendacky <thomas.lendacky@....com>
Subject: Re: [PATCH 01/16] x86/tsc: Add a standalone helpers for getting TSC
 info from CPUID.0x15

On Tue, Feb 11, 2025 at 09:25:47AM -0800, Sean Christopherson wrote:
> Because obviously optimizing code that's called once during boot is super
> critical?

Because let's stick 'em where they belong and keep headers containing only
small, trivial and inlineable functions. Having unusually big functions in
a header triggers my weird code patterns detector. :)

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette