Re: [tip:x86/urgent] x86/mce: Fix CMCI preemption bugs
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- Subject: Re: [tip:x86/urgent] x86/mce: Fix CMCI preemption bugs
- From: Borislav Petkov <bp@xxxxxxxxx>
- Date: Thu, 17 Apr 2014 21:42:41 +0200
- Cc: Josh Boyer <jwboyer@xxxxxxxxxxxxxxxxx>, Owen Kibel <qmewlo@xxxxxxxxx>, "Luck, Tony" <tony.luck@xxxxxxxxx>, Peter Zijlstra <peterz@xxxxxxxxxxxxx>, "mingo@xxxxxxxxxx" <mingo@xxxxxxxxxx>, "hpa@xxxxxxxxx" <hpa@xxxxxxxxx>, "linux-kernel@xxxxxxxxxxxxxxx" <linux-kernel@xxxxxxxxxxxxxxx>, "atodorov@xxxxxxxxxx" <atodorov@xxxxxxxxxx>, "gong.chen@xxxxxxxxxxxxxxx" <gong.chen@xxxxxxxxxxxxxxx>, "tglx@xxxxxxxxxxxxx" <tglx@xxxxxxxxxxxxx>, "linux-tip-commits@xxxxxxxxxxxxxxx" <linux-tip-commits@xxxxxxxxxxxxxxx>
- In-reply-to: <CA+55aFyz62W7CD9=9p9OxKuFs9Rck_p93E_40CqLat1HvDdf0Q@mail.gmail.com>
- User-agent: Mutt/1.5.23 (2014-03-12)
On Thu, Apr 17, 2014 at 12:25:14PM -0700, Linus Torvalds wrote:
> No, Owen tested a simpler patch that just changes the "get_cpu_var()"
> to "__get_cpu_var()" and avoids the preempt increment.
Which basically would be the same as doing this_cpu_write() in the
proposed fix - both don't touch preemption. So it is something else.
More staring...
--
Regards/Gruss,
Boris.
Sent from a fat crate under my desk. Formatting is fine.
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