From: Scott Wood <scottwood@freescale•com>
To: Mathieu Desnoyers <mathieu.desnoyers@polymtl•ca>
Cc: Eran Liberty <liberty@extricom•com>,
linux-kernel@vger•kernel.org, rostedt@goodmis•org,
linuxppc-dev@ozlabs•org, Steven Rostedt <srostedt@redhat•com>,
"Paul E. McKenney" <paulmck@linux•vnet.ibm.com>
Subject: Re: ftrace introduces instability into kernel 2.6.27(-rc2,-rc3)
Date: Mon, 18 Aug 2008 12:21:43 -0500 [thread overview]
Message-ID: <48A9AFA7.8080508@freescale.com> (raw)
In-Reply-To: <20080818154746.GA26835@Krystal>
Mathieu Desnoyers wrote:
> asm volatile (
> "1: lwz %1, 0(%2)\n"
> " cmpw %1, %5\n"
> " bne 2f\n"
> " stwu %3, 0(%2)\n"
> "2:\n"
> ".section .fixup, \"ax\"\n"
> "3: li %0, 1\n"
> " b 2b\n"
> ".previous\n"
> ".section __ex_table,\"a\"\n"
> _ASM_ALIGN "\n"
> _ASM_PTR "1b, 3b\n"
> ".previous"
> : "=r"(faulted), "=r"(replaced)
> : "r"(ip), "r"(new),
> "0"(faulted), "r"(old)
> : "memory");
Some (most likely unrelated) nits in the above inline asm:
Should use a "b" constraint for %2, or you could get r0. Or, use an "m"
constraint with %U2%X2 after the lwz/stw. Why stwu with an offset of
zero, BTW?
%1 also needs to be an early clobber.
-Scott
next prev parent reply other threads:[~2008-08-18 17:52 UTC|newest]
Thread overview: 60+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <48591941.4070408@extricom.com>
[not found] ` <48A92E15.2080709@extricom.com>
2008-08-18 15:07 ` ftrace introduces instability into kernel 2.6.27(-rc2,-rc3) Steven Rostedt
2008-08-18 15:47 ` Mathieu Desnoyers
2008-08-18 16:12 ` Steven Rostedt
2008-08-18 17:04 ` Mathieu Desnoyers
2008-08-18 17:21 ` Scott Wood [this message]
2008-08-18 18:27 ` Steven Rostedt
2008-08-18 18:29 ` Scott Wood
2008-08-19 1:53 ` Benjamin Herrenschmidt
2008-08-19 2:28 ` Steven Rostedt
2008-08-19 2:39 ` Benjamin Herrenschmidt
2008-08-19 2:41 ` Steven Rostedt
2008-08-19 2:47 ` Mathieu Desnoyers
2008-08-19 3:32 ` Steven Rostedt
2008-08-19 3:36 ` Mathieu Desnoyers
2008-08-19 4:00 ` Steven Rostedt
2008-08-19 16:47 ` Steven Rostedt
2008-08-19 17:34 ` Mathieu Desnoyers
2008-08-19 21:08 ` Steven Rostedt
2008-08-20 9:40 ` Nick Piggin
2008-08-19 21:47 ` Benjamin Herrenschmidt
2008-08-19 23:58 ` Jeremy Fitzhardinge
2008-08-20 1:17 ` Benjamin Herrenschmidt
2008-08-19 2:56 ` Benjamin Herrenschmidt
2008-08-19 3:12 ` Steven Rostedt
2008-08-19 4:17 ` Benjamin Herrenschmidt
2008-08-20 7:18 ` Benjamin Herrenschmidt
2008-08-20 13:14 ` Steven Rostedt
2008-08-20 13:19 ` Steven Rostedt
2008-08-20 13:36 ` Eran Liberty
2008-08-20 13:43 ` Steven Rostedt
2008-08-20 14:02 ` Eran Liberty
2008-08-20 14:55 ` Jon Smirl
2008-08-20 15:23 ` Steven Rostedt
2008-08-20 18:23 ` Eran Liberty
2008-08-20 18:33 ` Steven Rostedt
2008-08-20 15:27 ` Steven Rostedt
2008-08-20 21:37 ` Benjamin Herrenschmidt
2008-08-20 14:16 ` Josh Boyer
2008-08-20 14:22 ` Steven Rostedt
2008-08-20 14:50 ` Josh Boyer
2008-08-20 21:36 ` Benjamin Herrenschmidt
2008-08-20 21:44 ` Steven Rostedt
2008-08-18 18:47 ` Steven Rostedt
2008-08-18 18:56 ` Scott Wood
2008-08-18 19:28 ` Steven Rostedt
2008-08-18 18:25 ` Eran Liberty
2008-08-18 18:41 ` Mathieu Desnoyers
2008-08-19 1:54 ` Benjamin Herrenschmidt
2008-08-19 9:56 ` Eran Liberty
2008-08-19 13:02 ` Mathieu Desnoyers
2008-08-19 21:46 ` Benjamin Herrenschmidt
2008-08-18 18:50 ` Steven Rostedt
2008-08-19 12:09 ` Eran Liberty
2008-08-19 13:05 ` Mathieu Desnoyers
2008-08-19 14:21 ` Eran Liberty
2008-08-19 14:42 ` Mathieu Desnoyers
2008-08-19 20:15 ` Steven Rostedt
2008-08-20 11:18 ` Eran Liberty
2008-08-20 13:12 ` Steven Rostedt
2008-08-19 1:51 ` Benjamin Herrenschmidt
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