linux-kernel - [PATCH] x86_64 - UV fix for memory-only blades

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Message-ID: <20090515194508.GA8305@sgi.com>
Date:	Fri, 15 May 2009 14:45:08 -0500
From:	Jack Steiner <steiner@....com>
To:	mingo@...e.hu, tglx@...utronix.de
Cc:	linux-kernel@...r.kernel.org
Subject: [PATCH] x86_64 - UV fix for memory-only blades

Fix an endcase in handling UV blades that have memory
but no cpus. The calculation of the highest blade number
failed to handle these blades if they appear last in the
configuration.

Signed-off-by: Jack Steiner <steiner@....com>

---
 arch/x86/kernel/apic/x2apic_uv_x.c |    1 +
 1 file changed, 1 insertion(+)

Index: linux/arch/x86/kernel/apic/x2apic_uv_x.c
===================================================================
--- linux.orig/arch/x86/kernel/apic/x2apic_uv_x.c	2009-05-15 12:00:59.000000000 -0500
+++ linux/arch/x86/kernel/apic/x2apic_uv_x.c	2009-05-15 14:38:16.000000000 -0500
@@ -632,6 +632,7 @@ void __init uv_system_init(void)
 		pnode = (paddr >> m_val) & pnode_mask;
 		blade = boot_pnode_to_blade(pnode);
 		uv_node_to_blade[nid] = blade;
+		max_pnode = max(pnode, max_pnode);
 	}
 
 	map_gru_high(max_pnode);
--
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