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

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Date:	Mon,  4 Jan 2010 12:46:56 -0800 (PST)
From:	Roland McGrath <roland@...hat.com>
To:	Martin Schwidefsky <schwidefsky@...ibm.com>
Cc:	Oleg Nesterov <oleg@...hat.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)

> 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
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