From: Dave Hansen <dave.hansen@intel.com>
To: Fenghua Yu <fenghua.yu@intel.com>
Cc: "Luck, Tony" <tony.luck@intel.com>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, H Peter Anvin <hpa@zytor.com>,
"Raj, Ashok" <ashok.raj@intel.com>,
Alan Cox <alan@linux.intel.com>,
Peter Zijlstra <peterz@infradead.org>,
"Wysocki, Rafael J" <rafael.j.wysocki@intel.com>,
"Shankar, Ravi V" <ravi.v.shankar@intel.com>,
linux-kernel <linux-kernel@vger.kernel.org>, x86 <x86@kernel.org>
Subject: Re: [PATCH v2 3/4] x86/split_lock: Handle #AC exception for split lock
Date: Fri, 29 Jun 2018 10:47:19 -0700 [thread overview]
Message-ID: <ef677686-09d3-1739-d6fa-5aaa2a4a1e42@intel.com> (raw)
In-Reply-To: <20180629173948.GN18979@romley-ivt3.sc.intel.com>
On 06/29/2018 10:39 AM, Fenghua Yu wrote:
> On Fri, Jun 29, 2018 at 10:29:08AM -0700, Dave Hansen wrote:
>> On 06/29/2018 10:16 AM, Fenghua Yu wrote:
>>> On Fri, Jun 29, 2018 at 09:33:54AM -0700, Luck, Tony wrote:
>>>>>> + 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'.
>>> But WARN dump not only the state in the #AC handler, but also dump the regs
>>> in the current context. And WARN dumps stack.
>> Oh, I forgot about the fancy stack following. That might give us useful
>> output, although mixed with useless output about the #AC handler.
> The useful split lock info follows useless #AC handler info.
Can we do better than this?
Why don't I see the page fault stack in oopses that result in page
fault, for instance?
next prev parent reply other threads:[~2018-06-29 17:47 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-06-29 14:33 [PATCH v2 0/4] x86/split_lock: Enable #AC exception for split locked accesses Fenghua Yu
2018-06-29 14:33 ` [PATCH v2 1/4] x86/split_lock: Enumerate #AC exception for split locked access feature Fenghua Yu
2018-06-29 14:56 ` Dave Hansen
2018-06-29 16:23 ` Thomas Gleixner
2018-06-29 16:32 ` Dave Hansen
2018-07-04 20:07 ` Eduardo Habkost
2018-07-10 18:45 ` Fenghua Yu
2018-07-10 18:54 ` Dave Hansen
2018-07-10 19:47 ` Thomas Gleixner
2018-07-11 19:59 ` Dave Hansen
2018-07-12 20:00 ` Thomas Gleixner
2018-06-29 14:33 ` [PATCH v2 2/4] x86/split_lock: Align x86_capability to unsigned long to avoid split locked access Fenghua Yu
2018-06-29 16:04 ` Dave Hansen
2018-06-29 16:35 ` Thomas Gleixner
2018-06-29 19:03 ` Fenghua Yu
2018-06-29 20:08 ` Thomas Gleixner
2018-06-29 20:38 ` Fenghua Yu
2018-06-29 20:48 ` Dave Hansen
2018-06-29 21:10 ` Fenghua Yu
2018-06-29 21:44 ` Thomas Gleixner
2018-06-30 0:00 ` Fenghua Yu
2018-06-30 0:14 ` Fenghua Yu
2018-06-30 6:23 ` Thomas Gleixner
2018-07-02 12:18 ` Peter Zijlstra
2018-07-02 14:11 ` Fenghua Yu
2018-06-29 14:33 ` [PATCH v2 3/4] x86/split_lock: Handle #AC exception for split lock Fenghua Yu
2018-06-29 16:29 ` Dave Hansen
2018-06-29 16:33 ` Luck, Tony
2018-06-29 17:16 ` Fenghua Yu
2018-06-29 17:29 ` Dave Hansen
2018-06-29 17:39 ` Fenghua Yu
2018-06-29 17:47 ` Dave Hansen [this message]
2018-06-29 14:33 ` [PATCH v2 4/4] x86/split_lock: Disable #AC for split locked accesses Fenghua Yu
2018-06-29 16:31 ` Dave Hansen
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