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Message-ID: <20080922180535.GB22024@localhost>
Date: Mon, 22 Sep 2008 22:05:35 +0400
From: Cyrill Gorcunov <gorcunov@...il.com>
To: Aristeu Rozanski <aris@...hat.com>
Cc: Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org,
dzickus@...hat.com, prarit@...hat.com, vgoyal@...hat.com
Subject: Re: [PATCH] NMI watchdog: setup before enabling NMI watchdog
[Aristeu Rozanski - Mon, Sep 22, 2008 at 01:13:59PM -0400]
| There's a small window when NMI watchdog is being set up that if any NMIs
| are triggered, the NMI code will make make use of not initalized wd_ops
| elements:
Hi Aristeu,
thanks for the patch! I may be _absolutely_ wrong but could you
explain me how we reach this site in traps
---
if (!(reason & 0xc0)) {
if (notify_die(DIE_NMI_IPI, "nmi_ipi", regs, reason,
2, SIGINT) == NOTIFY_STOP)
return;
/*
* Ok, so this is none of the documented NMI sources,
* so it must be the NMI watchdog.
^^^^
*/
if (nmi_watchdog_tick(regs, reason))
return;
if (!do_nmi_callback(regs, cpu))
unknown_nmi_error(reason, regs);
return;
}
---
not having masked APIC registers as NMI entry yet (which is done during
perfctl initialization)?
- Cyrill -
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