Messages in this thread | | | Date | Mon, 11 Sep 2006 06:59:40 +0400 | From | Oleg Nesterov <> | Subject | Re: [PATCH] vt: Rework the console spawning variables. |
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On 09/10, Eric W. Biederman wrote: > > Oleg Nesterov <oleg@tv-sign.ru> writes: > > > On 09/10, Eric W. Biederman wrote: > >> > >> Updating this old code is painful. > > > > No, no, we shouldn't change the old code, it is fine. > > > So what happens when: > cpu0: cpu1: > kill_pid(vt_pid,....) fn_SAK()->vc_reset()->put_pid(xchg(&vt_pid, NULL)) > > Can't kill_pid dereference vt_pid after put_pid is called?
Ah, I didn't consider that patch as 'old code', sorry :)
I don't understand drivers/char/vt*, but surely put_pid(xchg()) can't work. Again, unless we have a lock to serialize access to ->vt_pid, but in that case we don't need xchg().
Oleg.
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