From mboxrd@z Thu Jan  1 00:00:00 1970
From: Ingo Molnar <mingo@kernel.org>
Subject: Re: [RFC PATCH v2 25/27] x86/cet: Add PTRACE interface for CET
Date: Thu, 12 Jul 2018 16:03:27 +0200
Message-ID: <20180712140327.GA7810@gmail.com>
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To: Yu-cheng Yu <yu-cheng.yu@intel.com>
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* Yu-cheng Yu <yu-cheng.yu@intel.com> wrote:

> > > diff --git a/arch/x86/kernel/ptrace.c b/arch/x86/kernel/ptrace.c
> > > index e2ee403865eb..ac2bc3a18427 100644
> > > --- a/arch/x86/kernel/ptrace.c
> > > +++ b/arch/x86/kernel/ptrace.c
> > > @@ -49,7 +49,9 @@ enum x86_regset {
> > >  	REGSET_IOPERM64 = REGSET_XFP,
> > >  	REGSET_XSTATE,
> > >  	REGSET_TLS,
> > > +	REGSET_CET64 = REGSET_TLS,
> > >  	REGSET_IOPERM32,
> > > +	REGSET_CET32,
> > >  };
> > Why does REGSET_CET64 alias on REGSET_TLS?
> 
> In x86_64_regsets[], there is no [REGSET_TLS].  The core dump code
> cannot handle holes in the array.

Is there a fundamental (ABI) reason for that?

> > to "CET" (which is a well-known acronym for "Central European Time"),
> > not to CFE?
> > 
> 
> I don't know if I can change that, will find out.

So what I'd suggest is something pretty simple: to use CFT/cft in kernel internal 
names, except for the Intel feature bit and any MSR enumeration which can be CET 
if Intel named it that way, and a short comment explaining the acronym difference.

Or something like that.

Thanks,

	Ingo