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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@oracle.com>
AuthorDate: Sat, 28 Jan 2012 13:52:46 +0300
Committer: Ingo Molnar <mingo@elte.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@oracle.com>
Acked-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Namhyung Kim <namhyung@gmail.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Clemens Ladisch <clemens@ladisch.de>
Link: http://lkml.kernel.org/r/20120128105246.GA25092@elgon.mountain
Signed-off-by: Ingo Molnar <mingo@elte.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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