linux-kernel - Re: [PATCH 1/2] x86: make save_stack_address() !CONFIG_FRAME

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Date:	Thu, 3 Jun 2010 21:52:00 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Arjan van de Ven <arjan@...ux.intel.com>,
	Ingo Molnar <mingo@...e.hu>,
	Roland McGrath <roland@...hat.com>,
	Vegard Nossum <vegard.nossum@...il.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] x86: make save_stack_address()
	!CONFIG_FRAME_POINTER friendly

On Thu, Jun 03, 2010 at 09:32:39PM +0200, Oleg Nesterov wrote:
> If CONFIG_FRAME_POINTER=n, print_context_stack() shouldn't neglect the
> non-reliable addresses on stack, this is all we have if dump_trace(bp)
> is called with the wrong or zero bp.
> 
> For example, /proc/pid/stack doesn't work if CONFIG_FRAME_POINTER=n.
> 
> This patch obviously has no effect if CONFIG_FRAME_POINTER=y, otherwise
> it reverts 1650743c "x86: don't save unreliable stack trace entries".
> 
> Also, remove the unnecessary type-cast.
> 
> Signed-off-by: Oleg Nesterov <oleg@...hat.com>


Acked-by: Frederic Weisbecker <fweisbec@...il.com>

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