From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Gabriel Paubert <paubert@iram.es>
Cc: ppc-dev <linuxppc-dev@ozlabs.org>,
Dave Liu <r63238@freescale.com>,
Paul Mackerras <paulus@samba.org>,
Kumar Gala <galak@gate.crashing.org>
Subject: Re: fsl booke MM vs. SMP questions
Date: Tue, 22 May 2007 19:14:38 +1000 [thread overview]
Message-ID: <1179825278.32247.827.camel@localhost.localdomain> (raw)
In-Reply-To: <20070522084645.GA12009@iram.es>
> Why do you want to clear the reservation here?
>
> Coming out of some code path with the reservation still held
> can only affect buggy code (someone doing st[dw]cx. before
> l[dw]arx) AFAIK.
And buggy CPUs :-)
Seriously, lots of CPU implementations don't test the address for local
lwarx stwcx. so if your kernel code "replaces" a reservation with
another that is left set, the userland stwcx. might well succeed which
is bogus.
Ben.
next prev parent reply other threads:[~2007-05-22 9:15 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-05-21 7:06 fsl booke MM vs. SMP questions Benjamin Herrenschmidt
[not found] ` <1179741447.3660.7.camel@localhost.localdomain>
[not found] ` <1179742083.32247.689.camel@localhost.localdomain>
2007-05-21 11:37 ` Dave Liu
2007-05-21 22:07 ` Benjamin Herrenschmidt
2007-05-22 3:09 ` Benjamin Herrenschmidt
2007-05-22 10:56 ` Dave Liu
2007-05-22 22:42 ` Benjamin Herrenschmidt
2007-05-23 2:38 ` Dave Liu
2007-05-23 3:08 ` Benjamin Herrenschmidt
2007-05-28 9:05 ` Liu Dave-r63238
2007-05-28 9:24 ` Benjamin Herrenschmidt
2007-05-28 9:37 ` Liu Dave-r63238
2007-05-28 10:00 ` Benjamin Herrenschmidt
2007-05-28 10:23 ` Gabriel Paubert
2007-05-28 10:28 ` Benjamin Herrenschmidt
2007-05-22 8:46 ` Gabriel Paubert
2007-05-22 9:14 ` Benjamin Herrenschmidt [this message]
2007-05-22 10:02 ` Gabriel Paubert
2007-05-22 10:05 ` Benjamin Herrenschmidt
2007-05-23 9:12 ` Gabriel Paubert
2007-05-22 3:03 ` Kumar Gala
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