From: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
To: Ingo Molnar <mingo@redhat.com>
Cc: Andrew Morton <akpm@osdl.org>,
Greg Kroah-Hartman <gregkh@suse.de>,
Christoph Hellwig <hch@infradead.org>,
linux-kernel@vger.kernel.org, ltt-dev@shafik.org,
"Martin J. Bligh" <mbligh@mbligh.org>,
Douglas Niehaus <niehaus@eecs.ku.edu>,
systemtap@sources.redhat.com,
Thomas Gleixner <tglx@linutronix.de>,
Richard J Moore <richardj_moore@uk.ibm.com>
Subject: [PATCH 1/2] lockdep missing barrier()
Date: Tue, 16 Jan 2007 12:56:24 -0500 [thread overview]
Message-ID: <20070116175624.GA16022@Krystal> (raw)
In-Reply-To: <OFAB3D8A6C.1643F2D3-ON80257262.000581E4-80257262.00088F04@uk.ibm.com>
This patch adds a barrier() to lockdep.c lockdep_recursion updates. This
variable behaves like the preemption count and should therefore use similar
memory barriers.
This patch applies on 2.6.20-rc4-git3.
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
--- a/kernel/lockdep.c
+++ b/kernel/lockdep.c
@@ -166,12 +166,14 @@ static struct list_head chainhash_table[CHAINHASH_SIZE];
void lockdep_off(void)
{
current->lockdep_recursion++;
+ barrier();
}
EXPORT_SYMBOL(lockdep_off);
void lockdep_on(void)
{
+ barrier();
current->lockdep_recursion--;
}
--
OpenPGP public key: http://krystal.dyndns.org:8080/key/compudj.gpg
Key fingerprint: 8CD5 52C3 8E3C 4140 715F BA06 3F25 A8FE 3BAE 9A68
next prev parent reply other threads:[~2007-01-16 17:56 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-12-20 23:52 [PATCH 0/4] Linux Kernel Markers Mathieu Desnoyers
2006-12-20 23:57 ` [PATCH 1/4] Linux Kernel Markers : Architecture agnostic code Mathieu Desnoyers
2006-12-20 23:59 ` [PATCH 2/4] Linux Kernel Markers : kconfig menus Mathieu Desnoyers
2006-12-21 0:00 ` [PATCH 3/4] Linux Kernel Markers : i386 optimisation Mathieu Desnoyers
2006-12-21 0:01 ` [PATCH 4/4] Linux Kernel Markers : powerpc optimisation Mathieu Desnoyers
2006-12-21 0:01 ` Mathieu Desnoyers
2007-01-13 1:33 ` [PATCH 0/4] Linux Kernel Markers Richard J Moore
2007-01-13 5:45 ` Mathieu Desnoyers
2007-01-16 17:41 ` [PATCH 0/4 update] Linux Kernel Markers - i386 : pIII erratum 49 : XMC Mathieu Desnoyers
2007-01-16 18:35 ` Frank Ch. Eigler
2007-01-16 21:27 ` [PATCH 0/4 update] kprobes and traps Mathieu Desnoyers
2007-01-17 12:25 ` S. P. Prasanna
2007-01-16 17:56 ` Mathieu Desnoyers [this message]
2007-01-24 4:26 ` [PATCH 1/2] lockdep missing barrier() Andrew Morton
2007-01-24 16:51 ` Mathieu Desnoyers
2007-01-24 17:24 ` [PATCH] order of lockdep off/on in vprintk() should be changed Mathieu Desnoyers
2007-01-24 17:55 ` [PATCH] minimize lockdep_on/off side-effect Mathieu Desnoyers
2007-01-16 17:56 ` [PATCH 2/2] lockdep reentrancy Mathieu Desnoyers
2007-01-24 4:29 ` Andrew Morton
2007-01-24 16:55 ` Mathieu Desnoyers
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