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SubjectRe: [PATCH v2 1/2] pidfd: add P_PIDFD to waitid()
On Sat, Jul 27, 2019 at 09:28:40AM -0700, Linus Torvalds wrote:

> is the stupid and straightforward thing, but if you want to be
> *clever* you can actually avoid getting a reference to the 'struct
> file *" entirely, and do the fd->pid lookup under rcu_read_lock()
> instead. It's slightly more complex, but it avoids the fdget/fdput
> reference count games entirely.

Yecchhh... Please, don't do the last part - at least not unless
we really see that in profiles.

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