linux-kernel - RE: [PATCH v2 3/4] x86/split_lock: Handle #AC exception for split lock

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Date:   Fri, 29 Jun 2018 16:33:54 +0000
From:   "Luck, Tony" <tony.luck@...el.com>
To:     "Hansen, Dave" <dave.hansen@...el.com>,
        "Yu, Fenghua" <fenghua.yu@...el.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, H Peter Anvin <hpa@...or.com>
CC:     "Raj, Ashok" <ashok.raj@...el.com>,
        Alan Cox <alan@...ux.intel.com>,
        "Peter Zijlstra" <peterz@...radead.org>,
        "Wysocki, Rafael J" <rafael.j.wysocki@...el.com>,
        "Shankar, Ravi V" <ravi.v.shankar@...el.com>,
        linux-kernel <linux-kernel@...r.kernel.org>, x86 <x86@...nel.org>
Subject: RE: [PATCH v2 3/4] x86/split_lock: Handle #AC exception for split
 lock

>> +	WARN_ONCE(1, "A split lock issue is detected. Please FIX it\n");
>
> But, warning here is also not super useful.  Shouldn't we be dumping out
> the info in 'regs' instead of the current context?  We don't care about
> the state in the #AC handler, we care about 'regs'.

Maybe:

	WARN_ONCE(1, "split lock detected at %pF\n", regs[EIP]);

-Tony