Re: [PATCH] Introduce ActivePid: in /proc/self/status (v2, wasVpid:)

From: Oleg Nesterov
Date: Thu Jun 16 2011 - 09:21:19 EST

On 06/16, Greg Kurz wrote:
> Ok. You're right, the RCU grace period is just what I need to ensure I
> won't dereference a stale pointer. So I don't even have to bother with
> ->siglock and just check pid_alive() before peeking into pid->numbers.

Yes, but you don't really need pid_alive(). Just read ->pids[].pid and
check it is !NULL before dereferencing. Also, we already have 2 pid_alive()
checks, this is ugly. You can consolidate this code.


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