linux-kernel - Re: [S390] Fix reboot hang on LPARs

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Date:	Sat, 16 Dec 2006 11:31:39 +0100
From:	Martin Schwidefsky <schwidefsky@...ibm.com>
To:	Heiko Carstens <heiko.carstens@...ibm.com>
Cc:	linux-kernel@...r.kernel.org, holzheu@...ibm.com
Subject: Re: [S390] Fix reboot hang on LPARs

On Fri, 2006-12-15 at 22:15 +0100, Heiko Carstens wrote:
> This is broken. pgm_check_occured must be volatile, otherwise the -EIO path
> in stsch_reset might get optimized away.

That is true, good spotting. Only adding a "volatile" in not the right
solution. The point here is that the stsch inline assembly can write to
pgm_check_occured. We better tell the compiler, e.g. by adding a
"memory" clobber or better a "+m" (pgm_check_occured). For the later
we'd have to copy the inline assembly though.

-- 
blue skies,
  Martin.

Martin Schwidefsky
Linux for zSeries Development & Services
IBM Deutschland Entwicklung GmbH

"Reality continues to ruin my life." - Calvin.

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