mirror of
https://github.com/torvalds/linux
synced 2024-10-02 09:18:22 +00:00
documentation: Emphasize the call_rcu() is illegal from idle
Although call_rcu()'s fastpath works just fine on an idle CPU, some branches of the slowpath invoke the scheduler, which uses RCU. Therefore, this commit emphasizes the fact that call_rcu() must not be invoked from an idle CPU. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
This commit is contained in:
parent
5413e24c94
commit
0c7d10e4b9
|
@ -1650,7 +1650,7 @@ situations where neither <tt>synchronize_rcu()</tt> nor
|
|||
including within preempt-disable code, <tt>local_bh_disable()</tt> code,
|
||||
interrupt-disable code, and interrupt handlers.
|
||||
However, even <tt>call_rcu()</tt> is illegal within NMI handlers
|
||||
and from offline CPUs.
|
||||
and from idle and offline CPUs.
|
||||
The callback function (<tt>remove_gp_cb()</tt> in this case) will be
|
||||
executed within softirq (software interrupt) environment within the
|
||||
Linux kernel,
|
||||
|
|
Loading…
Reference in a new issue