linux-kernel - [PATCH v1 2/3] SMP: simpilify function generic_smp_call_function_single

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Date:	Sun,  8 Sep 2013 23:22:24 +0800
From:	Jiang Liu <liuj97@...il.com>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	Shaohua Li <shli@...nel.org>, Wang YanQing <udknight@...il.com>
Cc:	liuj97@...il.com, Jiang Liu <jiang.liu@...wei.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Ingo Molnar <mingo@...e.hu>,
	Steven Rostedt <rostedt@...dmis.org>,
	Paul Gortmaker <paul.gortmaker@...driver.com>,
	liguang <lig.fnst@...fujitsu.com>, linux-kernel@...r.kernel.org
Subject: [PATCH v1 2/3] SMP: simpilify function generic_smp_call_function_single_interrupt()

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

Now the call_single_data data structure is always locked by invoking
csd_lock() before inserting it into corresponding call_single_queue
list, so no need to save and check csd->flags in function
generic_smp_call_function_single_interrupt().

Signed-off-by: Jiang Liu <jiang.liu@...wei.com>
Cc: Jiang Liu <liuj97@...il.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Wang YanQing <udknight@...il.com>
Cc: Shaohua Li <shli@...nel.org>
Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc: Ingo Molnar <mingo@...e.hu>
Cc: Steven Rostedt <rostedt@...dmis.org>
Cc: Paul Gortmaker <paul.gortmaker@...driver.com>
Cc: liguang <lig.fnst@...fujitsu.com>
Cc: linux-kernel@...r.kernel.org
---
 kernel/smp.c | 16 +---------------
 1 file changed, 1 insertion(+), 15 deletions(-)

diff --git a/kernel/smp.c b/kernel/smp.c
index a034712..baa2a65 100644
--- a/kernel/smp.c
+++ b/kernel/smp.c
@@ -181,25 +181,11 @@ void generic_smp_call_function_single_interrupt(void)
 
 	while (!list_empty(&list)) {
 		struct call_single_data *csd;
-		unsigned int csd_flags;
 
 		csd = list_entry(list.next, struct call_single_data, list);
 		list_del(&csd->list);
-
-		/*
-		 * 'csd' can be invalid after this call if flags == 0
-		 * (when called through generic_exec_single()),
-		 * so save them away before making the call:
-		 */
-		csd_flags = csd->flags;
-
 		csd->func(csd->info);
-
-		/*
-		 * Unlocked CSDs are valid through generic_exec_single():
-		 */
-		if (csd_flags & CSD_FLAG_LOCK)
-			csd_unlock(csd);
+		csd_unlock(csd);
 	}
 }
 
-- 
1.8.1.2

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