linux-kernel - Re: Re-implement MCE log ring buffer as per-CPU ring buffer

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Mon, 27 Apr 2009 09:53:19 +0200
From:	Andi Kleen <ak@...ux.intel.com>
To:	Huang Ying <ying.huang@...el.com>
CC:	Steven Rostedt <rostedt@...dmis.org>,
	Robert Richter <robert.richter@....com>,
	Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Hidetoshi Seto <seto.hidetoshi@...fujitsu.com>
Subject: Re: Re-implement MCE log ring buffer as per-CPU ring buffer

Huang Ying wrote:
> On Fri, 2009-04-24 at 21:36 +0800, Steven Rostedt wrote:
>> On Fri, 24 Apr 2009, Robert Richter wrote:
>>>> It seems that ring_buffer is not NMI-safe, while mcelog buffer will be
>>>> used in NMI context and interrupt context. When will ring_buffer to be
>>>> NMI-safe?
>>> You can use it in nmi context with separate read and write
>>> buffers. See this patch description:
>>> 6dad828b76c7224a22ddc9ce7aa495d994f03b31
>>>
>>> Not sure if somebody will make the ring_buffer non-locking.
>> It already is ;-)
>>
>> I've put in for a patent application on the algorithm so I must wait till 
>> it is processed before I can release the code.
> 
> When will it be merged by mainline kernel? Do you have a plan?

Patent applications tend to be measured in years. Also I'm not sure
we really want patented algorithms in the kernel anyways if it can
be avoided. So the patent probably makes it impractical to use this
thing at all.

-Andi
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/