On Tue, Nov 14, 2017 at 11:10:23AM -0800, Hugh Dickins wrote: > I was about to agree, but now I'm not so sure. I don't know much > about these PMC things, but at a glance it looks like what is reserved > by x86_reserve_hardware() may later be released by x86_release_hardware(), > and then later reserved again by x86_reserve_hardware(). And although > the static per-cpu area would be zeroed the first time, the second time > it will contain data left over from before, so really needs the memset?
Ah, yes. It does get reused. I think its still fine, but yes lets keep it. Better safe than sorry and its not a hot path in any case. Thanks!
