linux-kernel - Re: powerpc: fork && stepping (Was: [RFC,PATCH 0/14] utrace/ptrace)

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Message-ID: <m28wdsykot.fsf@igel.home>
Date:	Thu, 26 Nov 2009 23:40:02 +0100
From:	Andreas Schwab <schwab@...ux-m68k.org>
To:	Paul Mackerras <paulus@...ba.org>
Cc:	Oleg Nesterov <oleg@...hat.com>,
	Veaceslav Falico <vfalico@...hat.com>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Alexey Dobriyan <adobriyan@...il.com>,
	Christoph Hellwig <hch@...radead.org>,
	"Frank Ch. Eigler" <fche@...hat.com>, Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <peterz@...radead.org>,
	Roland McGrath <roland@...hat.com>,
	linux-kernel@...r.kernel.org, utrace-devel@...hat.com,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Subject: Re: powerpc: fork && stepping (Was: [RFC,PATCH 0/14] utrace/ptrace)

Paul Mackerras <paulus@...ba.org> writes:

> I believe gdb has code to recognize this kind of sequence and run
> through it without stopping until after the bne, precisely to avoid
> this problem.

See gdb/rs6000-tdep.c:ppc_deal_with_atomic_sequence.

Andreas.

-- 
Andreas Schwab, schwab@...ux-m68k.org
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