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

From: Salman Qazi
Date: Wed Jun 09 2010 - 14:10:00 EST

On Wed, Jun 9, 2010 at 10:47 AM, <tytso@xxxxxxx> wrote:
> On Wed, Jun 09, 2010 at 10:43:33AM -0700, Linus Torvalds wrote:
>> We need that bitmap to handle the overflow max_pid case. We are _not_
>> returning just increasing pid numbers.
> Doh!  I knew I was forgetting something obvious.  I was hoping we
> could get rid of the bitmap entirely, but I guess not....
> (Unless users would stand for 64-bit pid numbers... no?  Dang. :-)
>                                      - Ted

(sorry about the previous message, to those who got it... my mail
client silently switched to HTML mode)

I am working on a new version of the change taking into account
comments (both about substance and style) by Michel, Ted and Linus. I
agree with Michel in that I am not sure that the rare case of same
last_pid being set by two threads is worth fixing.
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