Re: [PATCH] Fix a race in pid generation that causes pids to bereused immediately.

From: Linus Torvalds
Date: Wed Jun 09 2010 - 13:44:02 EST

On Wed, 9 Jun 2010, tytso@xxxxxxx wrote:
> Well, I was thinking about something like this:

No, this is wrong for the case where you end up having to allocate a new
pidmap and/or overflow max_pid.

It also doesn't set the bit at all.

> There appears to be some interesting uses of the bitmap by
> find_ge_pid() and next_pidmap() that I haven't completely grokked yet,

We need that bitmap to handle the overflow max_pid case. We are _not_
returning just increasing pid numbers.

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