linux-kernel - Re: s390 && user_enable_single_step() (Was: odd utrace testing results on s390x)

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Message-Id: <20100106211329.DB4F5134D@magilla.sf.frob.com>
Date:	Wed,  6 Jan 2010 13:13:29 -0800 (PST)
From:	Roland McGrath <roland@...hat.com>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	Martin Schwidefsky <schwidefsky@...ibm.com>, caiqian@...hat.com,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	Jan Kratochvil <jkratoch@...hat.com>,
	linux-kernel@...r.kernel.org, linux-s390@...r.kernel.org,
	utrace-devel@...hat.com
Subject: Re: s390 && user_enable_single_step() (Was: odd utrace testing
	results on s390x)

> However, with or without CONFIG_UTRACE, 6580807da14c423f0d0a708108e6df6ebc8bc83d
> is needed on s390 too, otherwise the child gets unnecessary traps.

This confuses me.  user_disable_single_step on non-current doesn't do
anything not already done by the memset in copy_thread.  Ooh, except
perhaps it does not clear PSW_MASK_PER.  Maybe that matters.  That's
the only thing I can think of.  Maybe Martin can make sense of it.


Thanks,
Roland
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