linux-kernel - Re: mmotm 2009-09-09-22-56 uploaded

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Message-ID: <alpine.DEB.1.00.0909180339200.6267@chino.kir.corp.google.com>
Date:	Fri, 18 Sep 2009 03:41:10 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Suresh Jayaram <sureshjayaram@...il.com>,
	Ingo Molnar <mingo@...e.hu>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	mm-commits@...r.kernel.org, linux-kernel@...r.kernel.org,
	Thomas Gleixner <tglx@...utronix.de>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Yinghai Lu <yinghai@...nel.org>,
	Jesse Brandeburg <jesse.brandeburg@...il.com>
Subject: Re: mmotm 2009-09-09-22-56 uploaded

On Fri, 18 Sep 2009, David Rientjes wrote:

> This seems to be related to 2547089 "x86/PCI: initialize PCI bus node 
> numbers early" since cpumask_of_pcibus() on x86 doesn't check for -1 
> pcibus_to_node() like most other architectures.  It'll simply index into 
> cpumask_of_node for whatever the pci_sysdata's node is, and in this case 
> that's -1.
> 

Suresh, could you give this patch a try?  It turns out that the 
mp_bus_to_node map simply leaves all busses that don't have memory 
affinity to -1, so cpu_online_mask is actually the appropriate cpumask to 
return and x86 doesn't catch this.


x86: default pcibus cpumask to all cpus if it lacks affinity

The early initialization of the pci bus to node mapping leaves all busses
with a node id of -1 if it lacks memory affinity.  Thus, cpumask_of_pcibus
must return all online cpus for such busses.

Signed-off-by: David Rientjes <rientjes@...gle.com>
---
 arch/x86/include/asm/pci.h |    6 +++++-
 1 files changed, 5 insertions(+), 1 deletions(-)

diff --git a/arch/x86/include/asm/pci.h b/arch/x86/include/asm/pci.h
--- a/arch/x86/include/asm/pci.h
+++ b/arch/x86/include/asm/pci.h
@@ -143,7 +143,11 @@ static inline int __pcibus_to_node(const struct pci_bus *bus)
 static inline const struct cpumask *
 cpumask_of_pcibus(const struct pci_bus *bus)
 {
-	return cpumask_of_node(__pcibus_to_node(bus));
+	int node;
+
+	node = __pcibus_to_node(bus);
+	return (node == -1) ? cpu_online_mask :
+			      cpumask_of_node(node);
 }
 #endif
 
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