Re: [PATCH] fix tasklist + find_pid() with CONFIG_PREEMPT_RCU

From: Andrew Morton
Date: Tue Jan 29 2008 - 18:03:25 EST


On Tue, 29 Jan 2008 19:40:19 +0300
Oleg Nesterov <oleg@xxxxxxxxxx> wrote:

> With CONFIG_PREEMPT_RCU read_lock(tasklist_lock) doesn't imply rcu_read_lock(),

I'm suspecting that we have other code which assumes that read_lock, write_lock
and spin_lock imply rcu_read_lock().

I wonder if there are any sane runtime checks we can put in there to find
such problems.
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