linux-kernel - Re: [PATCH v1 4/6] x86/hyperv: Add trampoline asm code to transition from hypervisor

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Message-ID: <20250919090625.GBaM0dEegelsB724bZ@fat_crate.local>
Date: Fri, 19 Sep 2025 11:06:25 +0200
From: Borislav Petkov <bp@...en8.de>
To: Michael Kelley <mhklinux@...look.com>,
	Mukesh R <mrathor@...ux.microsoft.com>
Cc: "linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>,
	"kys@...rosoft.com" <kys@...rosoft.com>,
	"haiyangz@...rosoft.com" <haiyangz@...rosoft.com>,
	"wei.liu@...nel.org" <wei.liu@...nel.org>,
	"decui@...rosoft.com" <decui@...rosoft.com>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	"mingo@...hat.com" <mingo@...hat.com>,
	"dave.hansen@...ux.intel.com" <dave.hansen@...ux.intel.com>,
	"x86@...nel.org" <x86@...nel.org>, "hpa@...or.com" <hpa@...or.com>,
	"arnd@...db.de" <arnd@...db.de>
Subject: Re: [PATCH v1 4/6] x86/hyperv: Add trampoline asm code to transition
 from hypervisor

On Thu, Sep 18, 2025 at 11:52:35PM +0000, Michael Kelley wrote:
> From: Mukesh R <mrathor@...ux.microsoft.com> Sent: Tuesday, September 16, 2025 2:31 PM
> > 
> > On 9/15/25 10:55, Michael Kelley wrote:
> > > From: Mukesh Rathor <mrathor@...ux.microsoft.com> Sent: Tuesday, September 9, 2025 5:10 PM
> > >>
> > >> Introduce a small asm stub to transition from the hypervisor to linux
> > >
> > > I'd argue for capitalizing "Linux" here and in other places in commit
> > > text and code comments throughout this patch set.
> > 
> > I'd argue against it. A quick grep indicates it is a common practice,
> > and in the code world goes easy on the eyes :).

But not in commit messages.

Commit messages should be maximally readable and things should start in
capital letters if that is their common spelling.

When it comes to "Linux", yeah, that's so widespread so you have both. If I'm
referring to what Linux does as a policy or in general or so on, I'd spell it
capitalized but I don't think we've enforced that too strictly...

> I'll offer a final comment on this topic, and then let it be. There's
> a history of Greg K-H, Marc Zyngier, Boris Petkov, Sean Christopherson,
> and other maintainers giving comments to use the capitalized form
> of "Linux", "MSR", "RAM", etc. See:

MSR, RAM and other abbreviations are capitalized and that's the only correct
way to spell them.

> > >> upon devirtualization.

What is "devirtualization"?

> > since control comes back to linux at the callback here, i fail to
> > understand what is vague about it. when hyp completes devirt,
> > devirt is complete.

This "speak" is what gets on my nerves. You're writing here as if everyone is
in your head and everyone knows what "hyp" and "devirt" is.

Commit mesages are not code and they should be maximally readable and
accessible to the widest audience, not only to the three people who develop
the feature.

If this patch were aimed at the things I maintain, it'll need a serious commit
message scrubbing and sanitizing first.

HTH.

-- 
Regards/Gruss,
    Boris.

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