linux-kernel - Re: [PATCH v2 20/27] KVM: x86/mmu: Use page-track notifiers iff there are external users

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Message-ID: <ZBLhZBITQo/ieexM@yzhao56-desk.sh.intel.com>
Date:   Thu, 16 Mar 2023 17:29:08 +0800
From:   Yan Zhao <yan.y.zhao@...el.com>
To:     Sean Christopherson <seanjc@...gle.com>
CC:     Paolo Bonzini <pbonzini@...hat.com>,
        Zhenyu Wang <zhenyuw@...ux.intel.com>,
        Zhi Wang <zhi.a.wang@...el.com>, <kvm@...r.kernel.org>,
        <intel-gvt-dev@...ts.freedesktop.org>,
        <intel-gfx@...ts.freedesktop.org>, <linux-kernel@...r.kernel.org>,
        Ben Gardon <bgardon@...gle.com>
Subject: Re: [PATCH v2 20/27] KVM: x86/mmu: Use page-track notifiers iff
 there are external users

On Wed, Mar 15, 2023 at 09:21:34AM -0700, Sean Christopherson wrote:
> On Wed, Mar 15, 2023, Yan Zhao wrote:
> > Nit: there is a typo in the commit header: "iff" -> "if"
> > 
> > > -void kvm_page_track_write(struct kvm_vcpu *vcpu, gpa_t gpa, const u8 *new,
> > > -			  int bytes)
> > > +void __kvm_page_track_write(struct kvm *kvm, gpa_t gpa, const u8 *new, int bytes)
> > Line length is 81 characters. A little longer than 80 :)
> > 
> > > +static inline bool kvm_page_track_has_external_user(struct kvm *kvm) { return false; }
> > This line is also too long.
> 
> The 80 character limit is a "soft" limit these days, e.g. checkpatch only complains
> if a line is 100+.  In KVM x86, the preferred style is to treat the 80 char limit
> as "firm", for lack of a better word.  E.g. let a line run over if it's just a
> char or two and there's no other wrapping in the declaration, but don't create long
> lines just because checkpatch no longer yells.
> 
Got it. It's helpful to me!

> There's obviously a fair bit of subjectivity, but the guideline has worked well
> so far (hopefully I didn't just jinx us).