linux-kernel - [patch] x86, dumpstack: removed unneeded check in dump

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Message-ID: <20120128105246.GA25092@elgon.mountain>
Date:	Sat, 28 Jan 2012 13:52:46 +0300
From:	Dan Carpenter <dan.carpenter@...cle.com>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	Ingo Molnar <mingo@...hat.com>, "H. Peter Anvin" <hpa@...or.com>,
	x86@...nel.org, Frederic Weisbecker <fweisbec@...il.com>,
	Namhyung Kim <namhyung@...il.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Clemens Ladisch <clemens@...isch.de>,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: [patch] x86, dumpstack: removed 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>

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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