linux-kernel - [PATCH v2] generic-ipi: kill unnecessary variable

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Date:	Tue, 30 Jul 2013 11:06:09 +0800
From:	Xie XiuQi <xiexiuqi@...wei.com>
To:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:	Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Hanjun Guo <guohanjun@...wei.com>,
	Li Zefan <lizefan@...wei.com>
Subject: [PATCH v2] generic-ipi: kill unnecessary variable - csd_flags

After commit:8969a5ede0f9e17da4b943712429aef2c9bcd82b
"generic-ipi: remove kmalloc()", wait = 0 can be guaranteed.

And all callsites of generic_exec_single() do an unconditional
csd_lock() now.

So csd_flags is unnecessary now. Remote it.

Signed-off-by: Xie XiuQi <xiexiuqi@...wei.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Link: https://patchwork.kernel.org/patch/2834744/
---
 kernel/smp.c | 14 +-------------
 1 file changed, 1 insertion(+), 13 deletions(-)

diff --git a/kernel/smp.c b/kernel/smp.c
index fe9f773..7332697 100644
--- a/kernel/smp.c
+++ b/kernel/smp.c
@@ -186,25 +186,13 @@ 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);
 	}
 }

-- 
1.8.2.1


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