linux-kernel - [PATCH 5/6] x86, UV2: ack BAU interrupt earlier

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Date:	Mon, 16 Jan 2012 15:21:46 -0600
From:	Cliff Wickman <cpw@....com>
To:	linux-kernel@...r.kernel.org, mingo@...e.hu, x86@...nel.org
Cc:	mingo@...e.hu, x86@...nel.org
Subject: [PATCH 5/6] x86, UV2: ack BAU interrupt earlier


This patch moves the ack of the BAU interrupt to the beginning of 
the interrupt handler so that there is less possibility of a lost
interrupt and slower response to a shootdown message.

Signed-off-by: Cliff Wickman <cpw@....com>
---
 arch/x86/platform/uv/tlb_uv.c |    3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

Index: 120113.linux-3.2.1/arch/x86/platform/uv/tlb_uv.c
===================================================================
--- 120113.linux-3.2.1.orig/arch/x86/platform/uv/tlb_uv.c
+++ 120113.linux-3.2.1/arch/x86/platform/uv/tlb_uv.c
@@ -1218,6 +1218,7 @@ void uv_bau_message_interrupt(struct pt_
 	struct ptc_stats *stat;
 	struct msg_desc msgdesc;
 
+	ack_APIC_irq();
 	time_start = get_cycles();
 
 	bcp = &per_cpu(bau_control, smp_processor_id());
@@ -1247,8 +1248,6 @@ void uv_bau_message_interrupt(struct pt_
 		stat->d_nomsg++;
 	else if (count > 1)
 		stat->d_multmsg++;
-
-	ack_APIC_irq();
 }
 
 /*
--
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