linux-kernel - Re: [PATCH 19/28] mips,kgdb: kdb low level trap catch and stack trace

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Date:	Thu, 25 Feb 2010 15:01:21 +0100
From:	Ralf Baechle <ralf@...ux-mips.org>
To:	Jason Wessel <jason.wessel@...driver.com>
Cc:	linux-kernel@...r.kernel.org, kgdb-bugreport@...ts.sourceforge.net,
	mingo@...e.hu
Subject: Re: [PATCH 19/28] mips,kgdb: kdb low level trap catch and stack trace

On Fri, Feb 12, 2010 at 04:35:34PM -0600, Jason Wessel wrote:

> The only way the debugger can handle a trap in inside rcu_lock,
> notify_die, or atomic_notifier_call_chain without a recursive fault is
> to have a low level "first opportunity handler" do_trap_or_bp() handler.
> 
> Generally this will be something the vast majority of folks will not
> need, but for those who need it, it is added as a kernel .config
> option called KGDB_LOW_LEVEL_TRAP.
> 
> Also added was a die notification for oops such that kdb can catch an
> oops for analysis.
> 
> There appeared to be no obvious way to pass the struct pt_regs from
> the original exception back to the stack back tracer, so a special
> case was added to show_stack() for when kdb is active because you
> generally desire to generally look at the back trace of the original
> exception.
> 
> CC: Ralf Baechle <ralf@...ux-mips.org>
> Signed-off-by: Jason Wessel <jason.wessel@...driver.com>

Acked-by: Ralf Baechle <ralf@...ux-mips.org>

  Ralf
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