From: Peter Zijlstra on
On Fri, 2010-05-21 at 10:11 +0200, Frederic Weisbecker wrote:
> +static inline void perf_fetch_caller_regs(struct pt_regs *regs)
> {
> - unsigned long ip;
> -
> memset(regs, 0, sizeof(*regs));

btw, do we really need that memset?

As long as we don't actually copy out to userspace, it really doesn't
matter what is in there, and we should be setting all relevant registers

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