linux-kernel - [PATCH] x86: sgi uv BAU initialization

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Message-Id: <E1NBGB9-0005nU-Dp@eag09.americas.sgi.com>
Date:	Thu, 19 Nov 2009 17:12:43 -0600
From:	Cliff Wickman <cpw@....com>
To:	linux-kernel@...r.kernel.org
Cc:	mingo@...e.hu
Subject: [PATCH] x86: sgi uv BAU initialization

From: Cliff Wickman <cpw@....com>

A memory mapped register that affects the SGI UV Broadcast Assist Unit's
interrupt handling may sometimes be unintialized.

Remove the condition on its initialization, as that condition can be
randomly satisfied by a hardware reset.

Diffed against 2.6.32-rc7

Signed-off-by: Cliff Wickman <cpw@....com>
---
 arch/x86/kernel/tlb_uv.c |    4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

Index: 091119.linux/arch/x86/kernel/tlb_uv.c
===================================================================
--- 091119.linux.orig/arch/x86/kernel/tlb_uv.c
+++ 091119.linux/arch/x86/kernel/tlb_uv.c
@@ -817,10 +817,8 @@ static int __init uv_init_blade(int blad
 	 */
 	apicid = blade_to_first_apicid(blade);
 	pa = uv_read_global_mmr64(pnode, UVH_BAU_DATA_CONFIG);
-	if ((pa & 0xff) != UV_BAU_MESSAGE) {
-		uv_write_global_mmr64(pnode, UVH_BAU_DATA_CONFIG,
+	uv_write_global_mmr64(pnode, UVH_BAU_DATA_CONFIG,
 				      ((apicid << 32) | UV_BAU_MESSAGE));
-	}
 	return 0;
 }
 
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