From: Andreas Schwab <schwab@suse.de>
To: linux-ia64@vger.kernel.org
Subject: Re: Fix asm constraint in put_user
Date: Mon, 21 Nov 2005 16:48:31 +0000 [thread overview]
Message-ID: <jey83ilzfk.fsf@sykes.suse.de> (raw)
In-Reply-To: <je7jb2nigc.fsf@sykes.suse.de>
David Mosberger-Tang <David.Mosberger@acm.org> writes:
> If memory services, you should use the "o" constraint instead.
That doesn't work.
> Note that there is no "memory" clobber, so if you change from "m" to "r"
> constraint, GCC won't know that the location at "addr" is being stored
> to.
There is nothing worth clobbering here. The memory written to is
completely separate to anything GCC knows about. The old version didn't
clobber either.
Andreas.
--
Andreas Schwab, SuSE Labs, schwab@suse.de
SuSE Linux Products GmbH, Maxfeldstraße 5, 90409 Nürnberg, Germany
PGP key fingerprint = 58CA 54C7 6D53 942B 1756 01D3 44D5 214B 8276 4ED5
"And now for something completely different."
next prev parent reply other threads:[~2005-11-21 16:48 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-11-21 15:12 Fix asm constraint in put_user Andreas Schwab
2005-11-21 16:08 ` David Mosberger-Tang
2005-11-21 16:48 ` Andreas Schwab [this message]
2005-11-21 19:03 ` James E Wilson
2005-11-21 20:32 ` Andreas Schwab
2005-11-21 21:26 ` Andreas Schwab
2005-11-21 22:11 ` Luck, Tony
2005-11-21 22:38 ` David Mosberger-Tang
2005-11-23 6:02 ` James E Wilson
2005-11-23 22:08 ` James E Wilson
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