linux-kernel - Re: [PATCH 1/1] kernel/pid.c: Masking the flag out to get the actual value.

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Date:	Tue, 11 Jun 2013 18:53:50 -0700
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	"Raphael S. Carvalho" <raphael.scarv@...il.com>,
	"Serge E. Hallyn" <serge@...lyn.com>,
	Serge Hallyn <serge.hallyn@...onical.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] kernel/pid.c: Masking the flag out to get the actual value.

Andrew Morton <akpm@...ux-foundation.org> writes:

> On Tue, 11 Jun 2013 18:16:50 -0700 ebiederm@...ssion.com (Eric W. Biederman) wrote:
>
>> 
>> > Hopefully we can fix this one by adding the missing comment.
>> 
>> Perhaps we can fix this one by having people who care read the code and 
>> think about what it means?
>
> As is obvious from this thread, that approach isn't working.
>
>>  Seriously if we are adding pids/processes in
>> the pid namespace why would to clean up the pid namespace?
>
> A good way to communicate the design would be to describe the semantics
> of PIDNS_HASH_ADDING, at its definition site.
>
> [idly wonders what the heck pid_namespace.level and pid.level do,
> sigh]

Explaining the semantics a bit more seems reasonable.

Something like:

unsigned int level;  /* How deeply nested is this pid namespace */

#define PIDNS_HASH_ADDING (1U << 31)  /* Process are still entering the pid namespace */

Sorry I don't have the focus to make that into a proper patch.


Eric

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