Re: [PATCH] x86, 32-bit: Fix invalid stack address while in softirq

From: Steven Rostedt
Date: Thu Sep 06 2012 - 11:54:42 EST


On Thu, 2012-09-06 at 17:36 +0200, Robert Richter wrote:

> I meant:
>
> unsigned long kernel_stack_pointer(struct pt_regs *regs)
> {
> unsigned long context = (unsigned long)regs & ~(THREAD_SIZE - 1);
> unsigned long sp = (unsigned long)&regs->sp;
> struct thread_info *tinfo;
>
> if (context == (sp & ~(THREAD_SIZE - 1)))
> return sp;
>
> tinfo = (struct thread_info *)context;
> if (tinfo->previous_esp)
> return tinfo->previous_esp;
>
> return (unsigned long)regs;
> }
>
> -Robert
>
> >
> > Maybe this is even better.
> >
> >

Yeah, this is probably the safest.

Thanks,

-- Steve


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