linux-kernel - [tip:perf/urgent] x86/dumpstack: Remove unneeded check in dump

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Date:	Mon, 30 Jan 2012 05:20:51 -0800
From:	tip-bot for Dan Carpenter <dan.carpenter@...cle.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...hat.com,
	a.p.zijlstra@...llo.nl, namhyung@...il.com, fweisbec@...il.com,
	tglx@...utronix.de, mingo@...e.hu, dan.carpenter@...cle.com,
	clemens@...isch.de
Subject: [tip:perf/urgent] x86/dumpstack:
  Remove unneeded check in dump_trace()

Commit-ID:  d0caf292505d051b1026e85faf3a85e907566f31
Gitweb:     http://git.kernel.org/tip/d0caf292505d051b1026e85faf3a85e907566f31
Author:     Dan Carpenter <dan.carpenter@...cle.com>
AuthorDate: Sat, 28 Jan 2012 13:52:46 +0300
Committer:  Ingo Molnar <mingo@...e.hu>
CommitDate: Sat, 28 Jan 2012 13:09:06 +0100

x86/dumpstack: Remove unneeded check in dump_trace()

Smatch complains that we have some inconsistent NULL checking.

If "task" were NULL then it would lead to a NULL dereference
later. We can remove this test because earlier on in the
function we have:

 if (!task)
	task = current;

Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
Acked-by: Frederic Weisbecker <fweisbec@...il.com>
Cc: Namhyung Kim <namhyung@...il.com>
Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc: Clemens Ladisch <clemens@...isch.de>
Link: http://lkml.kernel.org/r/20120128105246.GA25092@elgon.mountain
Signed-off-by: Ingo Molnar <mingo@...e.hu>
---
 arch/x86/kernel/dumpstack_64.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/arch/x86/kernel/dumpstack_64.c b/arch/x86/kernel/dumpstack_64.c
index 6d728d9..af7785f 100644
--- a/arch/x86/kernel/dumpstack_64.c
+++ b/arch/x86/kernel/dumpstack_64.c
@@ -129,7 +129,7 @@ void dump_trace(struct task_struct *task, struct pt_regs *regs,
 	if (!stack) {
 		if (regs)
 			stack = (unsigned long *)regs->sp;
-		else if (task && task != current)
+		else if (task != current)
 			stack = (unsigned long *)task->thread.sp;
 		else
 			stack = &dummy;
--
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