linux-kernel - RE: [RFC PATCH v3 15/32] x86/fred: make unions for the cs and ss fields in struct pt

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Date:   Fri, 24 Feb 2023 16:34:36 +0000
From:   "Li, Xin3" <xin3.li@...el.com>
To:     "andrew.cooper3@...rix.com" <andrew.cooper3@...rix.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "x86@...nel.org" <x86@...nel.org>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>
CC:     "tglx@...utronix.de" <tglx@...utronix.de>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "bp@...en8.de" <bp@...en8.de>,
        "dave.hansen@...ux.intel.com" <dave.hansen@...ux.intel.com>,
        "hpa@...or.com" <hpa@...or.com>,
        "peterz@...radead.org" <peterz@...radead.org>,
        "Christopherson,, Sean" <seanjc@...gle.com>,
        "pbonzini@...hat.com" <pbonzini@...hat.com>,
        "Shankar, Ravi V" <ravi.v.shankar@...el.com>
Subject: RE: [RFC PATCH v3 15/32] x86/fred: make unions for the cs and ss
 fields in struct pt_regs

> > +	union {
> > +		unsigned long  csl; /* CS + any fields above it */
> 
> I guess that CSL here is supposed to mean cs long, but CSL (Current Stack Level) is a
> new term in the FRED spec which isn't this.

Good catch!

> 
> This causes changes such as the final hunk in patch 27 to read incorrectly, despite
> being technically correct.
> 
> cs_slot would be much clearer in code, but tbh, even cs_l would be better than the
> version without an underscore.

cs_slot sounds a good term unless someone comes up with a better one.

> 
> And obviously, whatever is done here should be mirrored for ss.

Probably ss_slot then.
  Xin