linux-kernel - [RFC PATCH v2 20/25] smp, tile: kill SMP single function call interrupt

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Date:	Thu, 12 Sep 2013 00:07:24 +0800
From:	Jiang Liu <liuj97@...il.com>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	Chris Metcalf <cmetcalf@...era.com>,
	Shaohua Li <shli@...nel.org>
Cc:	liuj97@...il.com, Jiang Liu <jiang.liu@...wei.com>,
	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Steven Rostedt <rostedt@...dmis.org>,
	Jiri Kosina <trivial@...nel.org>,
	Wang YanQing <udknight@...il.com>,
	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org
Subject: [RFC PATCH v2 20/25] smp, tile: kill SMP single function call interrupt

From: Jiang Liu <jiang.liu@...wei.com>

Commit 9a46ad6d6df3b54 "smp: make smp_call_function_many() use logic
similar to smp_call_function_single()" has unified the way to handle
single and multiple cross-CPU function calls. Now only one interrupt
is needed for architecture specific code to support generic SMP function
call interfaces, so kill the redundant single function call interrupt.

Signed-off-by: Jiang Liu <jiang.liu@...wei.com>
Cc: Jiang Liu <liuj97@...il.com>
---
 arch/tile/include/asm/smp.h | 7 +++----
 arch/tile/kernel/smp.c      | 6 +-----
 2 files changed, 4 insertions(+), 9 deletions(-)

diff --git a/arch/tile/include/asm/smp.h b/arch/tile/include/asm/smp.h
index 1aa759a..4b39184 100644
--- a/arch/tile/include/asm/smp.h
+++ b/arch/tile/include/asm/smp.h
@@ -67,19 +67,18 @@ static inline int xy_to_cpu(int x, int y)
 /* Hypervisor message tags sent via the tile send_IPI*() routines. */
 #define MSG_TAG_START_CPU		1
 #define MSG_TAG_STOP_CPU		2
-#define MSG_TAG_CALL_FUNCTION_MANY	3
-#define MSG_TAG_CALL_FUNCTION_SINGLE	4
+#define MSG_TAG_CALL_FUNCTION		3
 
 /* Hook for the generic smp_call_function_many() routine. */
 static inline void arch_send_call_function_ipi_mask(struct cpumask *mask)
 {
-	send_IPI_many(mask, MSG_TAG_CALL_FUNCTION_MANY);
+	send_IPI_many(mask, MSG_TAG_CALL_FUNCTION);
 }
 
 /* Hook for the generic smp_call_function_single() routine. */
 static inline void arch_send_call_function_single_ipi(int cpu)
 {
-	send_IPI_single(cpu, MSG_TAG_CALL_FUNCTION_SINGLE);
+	send_IPI_single(cpu, MSG_TAG_CALL_FUNCTION);
 }
 
 /* Print out the boot string describing which cpus were disabled. */
diff --git a/arch/tile/kernel/smp.c b/arch/tile/kernel/smp.c
index cbc73a8..44d7132 100644
--- a/arch/tile/kernel/smp.c
+++ b/arch/tile/kernel/smp.c
@@ -134,14 +134,10 @@ void evaluate_message(int tag)
 		smp_stop_cpu_interrupt();
 		break;
 
-	case MSG_TAG_CALL_FUNCTION_MANY: /* Call function on cpumask */
+	case MSG_TAG_CALL_FUNCTION: /* Call function on cpumask */
 		generic_smp_call_function_interrupt();
 		break;
 
-	case MSG_TAG_CALL_FUNCTION_SINGLE: /* Call function on one other CPU */
-		generic_smp_call_function_single_interrupt();
-		break;
-
 	default:
 		panic("Unknown IPI message tag %d", tag);
 		break;
-- 
1.8.1.2

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