linux-kernel - [PATCH] x86: fix set_extra_move

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Date:	Tue, 24 Mar 2009 13:23:16 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	x86@...nel.org, Ingo Molnar <mingo@...e.hu>
CC:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	linux-kernel@...r.kernel.org
Subject: [PATCH] x86: fix set_extra_move_desc calling


Impact: fix bug with desc moving when logical flat

Eric pointed out that we should compare with old affinity.
acctually this bug is introduced by:
| commit 22f65d31b25a320a5246592160bcb102d2791c45
|
| Author: Mike Travis <travis@....com>
| Date:   Tue Dec 16 17:33:56 2008 -0800
|
|    x86: Update io_apic.c to use new cpumask API
|
|    Impact: cleanup, consolidate patches, use new API

so need to move that before...

---
 arch/x86/kernel/apic/io_apic.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

Index: linux-2.6/arch/x86/kernel/apic/io_apic.c
===================================================================
--- linux-2.6.orig/arch/x86/kernel/apic/io_apic.c
+++ linux-2.6/arch/x86/kernel/apic/io_apic.c
@@ -592,8 +592,9 @@ set_desc_affinity(struct irq_desc *desc,
 	if (assign_irq_vector(irq, cfg, mask))
 		return BAD_APICID;
 
-	cpumask_and(desc->affinity, cfg->domain, mask);
+	/* check that before desc->addinity get updated */
 	set_extra_move_desc(desc, mask);
+	cpumask_and(desc->affinity, cfg->domain, mask);
 
 	return apic->cpu_mask_to_apicid_and(desc->affinity, cpu_online_mask);
 }
--
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