linux-kernel - Re: [PATCH] perf: fix kernel panic when parsing user space CS saved in pt

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Message-ID: <20140605091517.GB6758@twins.programming.kicks-ass.net>
Date:	Thu, 5 Jun 2014 11:15:17 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	"Zhang, Yanmin" <yanmin_zhang@...ux.intel.com>
Cc:	Liu ShuoX <shuox.liu@...el.com>, linux-kernel@...r.kernel.org,
	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...hat.com>,
	Zhang Yanmin <yanmin.zhang@...el.com>
Subject: Re: [PATCH] perf: fix kernel panic when parsing user space CS saved
 in pt_regs

On Thu, Jun 05, 2014 at 04:00:24PM +0800, Zhang, Yanmin wrote:
> On 2014/6/5 15:55, Peter Zijlstra wrote:

> >Why does pstore cause corruption? I thought that stuff was supposed to
> >be 'good' ?

> pstore is good if the board is reset by WarmReset as memory content is kept
> across rebooting.
> If it's a ColdReset, memory might lose some or all contents. My board uses
> Coldreset, which is a very
> fast ColdReset. Most memory content can be kept. But sometimes, some data
> has little change.

Oh, I thought pstore was persistent across cold resets or even power
outages. My bad then.

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