linux-kernel - Re: [PATCH v2] Documentation: Fill the gaps about entry/noinstr constraints

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Message-ID: <20211206175323.GB641268@paulmck-ThinkPad-P17-Gen-1>
Date:   Mon, 6 Dec 2021 09:53:23 -0800
From:   "Paul E. McKenney" <paulmck@...nel.org>
To:     Mark Rutland <mark.rutland@....com>
Cc:     Randy Dunlap <rdunlap@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Steven Rostedt <rostedt@...dmis.org>,
        Nicolas Saenz Julienne <nsaenzju@...hat.com>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        rcu@...r.kernel.org, Peter Zijlstra <peterz@...radead.org>,
        mtosatti <mtosatti@...hat.com>, frederic <frederic@...nel.org>,
        Jonathan Corbet <corbet@....net>
Subject: Re: [PATCH v2] Documentation: Fill the gaps about entry/noinstr
 constraints

On Mon, Dec 06, 2021 at 05:36:51PM +0000, Mark Rutland wrote:
> On Fri, Dec 03, 2021 at 07:48:08PM -0800, Randy Dunlap wrote:
> > On 12/1/21 12:35, Thomas Gleixner wrote:
> > > +Aside of that many architectures have to save register state, e.g. debug or
> > 
> >                                                           state (e.g. debug) or
> > 
> > > +cause registers before another exception of the same type can happen. A
> > 
> >    ^^^^^ cannot parse (with or without the change to the previous line)
> 
> I think the difficulty here is with "cause register"? That' a register which
> indicates the cause of an exception, e.g.
> 
> * MIPS has `cause` (coprocessor 0 register 13)
> * arm64 / AArch64 has `ESR_ELx` (Exception Syndrome Register, ELx)
> 
> We could probably clarify this as "exception cause registers" or "exception
> status registers", if that helps?

Or to make it word-by-word unambiguous, "exception-cause registers"
and "exception-status registers".

							Thanx, Paul