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| author | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2016-03-31 20:00:08 +0200 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2016-03-31 22:33:23 +0200 |
| commit | 0c7d10e4b998b2f751cebf98435f1ec2dd312c87 (patch) | |
| tree | 9b488381e266ee5eac0ddc62fd4b805913c4196f /Documentation/RCU | |
| parent | documentation: Sharpen up the no-readers quick quiz (diff) | |
| download | linux-0c7d10e4b998b2f751cebf98435f1ec2dd312c87.tar.xz linux-0c7d10e4b998b2f751cebf98435f1ec2dd312c87.zip | |
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>
Diffstat (limited to 'Documentation/RCU')
| -rw-r--r-- | Documentation/RCU/Design/Requirements/Requirements.html | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/Documentation/RCU/Design/Requirements/Requirements.html b/Documentation/RCU/Design/Requirements/Requirements.html index 85cf2238fd08..e7e24b3e86e2 100644 --- a/Documentation/RCU/Design/Requirements/Requirements.html +++ b/Documentation/RCU/Design/Requirements/Requirements.html @@ -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, |