Message-ID: <9ff94a5f-bb7e-501a-65cf-f260ae75b506@infradead.org>
Date:   Mon, 6 Dec 2021 13:24:03 -0800
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Subject: Re: [PATCH v2] Documentation: Fill the gaps about entry/noinstr
 constraints
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To:     paulmck@kernel.org, Mark Rutland <mark.rutland@arm.com>
Cc:     Thomas Gleixner <tglx@linutronix.de>,
        Steven Rostedt <rostedt@goodmis.org>,
        Nicolas Saenz Julienne <nsaenzju@redhat.com>,
        linux-kernel <linux-kernel@vger.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@lists.infradead.org>,
        rcu@vger.kernel.org, Peter Zijlstra <peterz@infradead.org>,
        mtosatti <mtosatti@redhat.com>, frederic <frederic@kernel.org>,
        Jonathan Corbet <corbet@lwn.net>
References: <875ys9dacq.ffs@tglx> <20211130091356.7336e277@gandalf.local.home>
 <878rx5b7i5.ffs@tglx> <YadU1aSE6/0yGWny@FVFF77S0Q05N> <87v9088a5q.ffs@tglx>
 <Yae9tbtZW5mjcBVt@FVFF77S0Q05N> <87ee6w83yw.ffs@tglx> <87bl2083mu.ffs@tglx>
 <1158239c-4e65-d3d9-41b3-4fedac856622@infradead.org>
 <Ya5KM05XaUBjlthn@FVFF77S0Q05N>
 <20211206175323.GB641268@paulmck-ThinkPad-P17-Gen-1>
From:   Randy Dunlap <rdunlap@infradead.org>
In-Reply-To: <20211206175323.GB641268@paulmck-ThinkPad-P17-Gen-1>
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On 12/6/21 09:53, Paul E. McKenney wrote:
> 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.

Oh. I see. Thanks.

>> * 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".

Any of those works. Or even 'cause' registers.

-- 
~Randy