linux-kernel - Re: ftrace introduces instability into kernel 2.6.27(-rc2,-rc3)

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Message-ID: <alpine.DEB.1.10.0808182304300.13401@gandalf.stny.rr.com>
Date:	Mon, 18 Aug 2008 23:12:35 -0400 (EDT)
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
cc:	Scott Wood <scottwood@...escale.com>,
	Eran Liberty <liberty@...ricom.com>,
	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>,
	linux-kernel@...r.kernel.org, linuxppc-dev@...abs.org,
	Steven Rostedt <srostedt@...hat.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Subject: Re: ftrace introduces instability into kernel 2.6.27(-rc2,-rc3)


On Tue, 19 Aug 2008, Benjamin Herrenschmidt wrote:

> Ok, so i did a patch, but it doesn't fix the problem. So
> there's something else whacking on the stack frames.

Is it 32 bit or 64?  I've tested the 64 bit quite a bit, but not so much 
the 32 (my powerbook is not usually that stable).

You might want to look at the entry.S mcount code too.

> 
> Still, here it is:

Thanks,

> 
> powerpc/ftrace: Fix broken assembly for code replacement
> 
> Instead, uses __get_user() and __put_user().
> 

Acked-by: Steven Rostedt <srostedt@...hat.com>

-- Steve

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