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

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Message-ID: <AANLkTikK6uiUsXrkFTextP4dmd0E6mddpYmvx7cT83-f@mail.gmail.com>
Date:	Wed, 9 Jun 2010 11:09:49 -0700
From:	Salman Qazi <sqazi@...gle.com>
To:	tytso@....edu, Linus Torvalds <torvalds@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>, Salman <sqazi@...gle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	peterz@...radead.org, akpm@...x-foundation.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	tytso@...gle.com, Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH] Fix a race in pid generation that causes pids to be 
	reused immediately.

On Wed, Jun 9, 2010 at 10:47 AM,  <tytso@....edu> 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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