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From: Roland McGrath <roland@redhat.com>
Subject: Re: s390 && user_enable_single_step() (Was: odd utrace testing
 results	on s390x)
In-Reply-To: Martin Schwidefsky's message of  Monday, 4 January 2010 17:16:26 +0100 <20100104171626.22ea2d9c@mschwide.boeblingen.de.ibm.com>
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Date: Mon,  4 Jan 2010 12:46:56 -0800 (PST)
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To: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Oleg Nesterov <oleg@redhat.com>, caiqian@redhat.com, Heiko Carstens <heiko.carstens@de.ibm.com>, Jan Kratochvil <jkratoch@redhat.com>, linux-kernel@vger.kernel.org, linux-s390@vger.kernel.org, utrace-devel@redhat.com
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> The PER control registers only get reloaded on task switch. Can you test
> if this patch fixes your problem?

Long ago when I first worked with David Wilder on s390 arch code,
I remember we made this change.  It seems to have been forgotten
in the later rounds of reworking and merging.


Thanks,
Roland