Re: [patch] x86, dumpstack: removed unneeded check in dump_trace()

[Frederic Weisbecker]

On Sat, Jan 28, 2012 at 01:52:46PM +0300, Dan Carpenter wrote:
> 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@xxxxxxxxxx>

Acked-by: Frederic Weisbecker <fweisbec@xxxxxxxxx>

> 
> 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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