linux-kernel - [tip:sched/core] generic-ipi: Kill unnecessary variable

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Date:	Wed, 31 Jul 2013 01:55:48 -0700
From:	tip-bot for Xie XiuQi <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...nel.org,
	rusty@...tcorp.com.au, torvalds@...ux-foundation.org,
	peterz@...radead.org, jens.axboe@...cle.com,
	paulmck@...ux.vnet.ibm.com, npiggin@...e.de, xiexiuqi@...wei.com,
	tglx@...utronix.de, oleg@...hat.com
Subject: [tip:sched/core] generic-ipi:
  Kill unnecessary variable - csd_flags

Commit-ID:  46591962cb5bfd2bfb0baf42497119c816503598
Gitweb:     http://git.kernel.org/tip/46591962cb5bfd2bfb0baf42497119c816503598
Author:     Xie XiuQi <xiexiuqi@...wei.com>
AuthorDate: Tue, 30 Jul 2013 11:06:09 +0800
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Tue, 30 Jul 2013 22:19:05 +0200

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. Remove it.

Signed-off-by: Xie XiuQi <xiexiuqi@...wei.com>
Signed-off-by: Peter Zijlstra <peterz@...radead.org>
Cc: Oleg Nesterov <oleg@...hat.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Nick Piggin <npiggin@...e.de>
Cc: Jens Axboe <jens.axboe@...cle.com>
Cc: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc: Rusty Russell <rusty@...tcorp.com.au>
Link: http://lkml.kernel.org/r/51F72DA1.7010401@huawei.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 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);
 	}
 }
 
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