diff options
| author | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2015-01-21 08:42:38 +0100 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2015-02-26 21:01:30 +0100 |
| commit | 39c8d313c3c546a414cc51b4f6571c2f8cc06407 (patch) | |
| tree | 0458ddbd0009594e20d0f5b3252395c73abe1836 /kernel/rcu | |
| parent | rcu: Refine diagnostics for lacking kthread for no-CBs callbacks (diff) | |
| download | linux-39c8d313c3c546a414cc51b4f6571c2f8cc06407.tar.xz linux-39c8d313c3c546a414cc51b4f6571c2f8cc06407.zip | |
rcu: Avoid clobbering early boot callbacks
When a CPU comes online, it initializes its callback list. This
is a bad thing if this is the first time that the CPU has come
online and if that CPU has early boot callbacks. This commit therefore
avoid initializing the callback list if there are callbacks present,
in which case the initial call_rcu() did the initialization for us.
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Diffstat (limited to 'kernel/rcu')
| -rw-r--r-- | kernel/rcu/tree.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c index fcfdbe53bb70..92fd3eab5823 100644 --- a/kernel/rcu/tree.c +++ b/kernel/rcu/tree.c @@ -3583,7 +3583,8 @@ rcu_init_percpu_data(int cpu, struct rcu_state *rsp) rdp->qlen_last_fqs_check = 0; rdp->n_force_qs_snap = rsp->n_force_qs; rdp->blimit = blimit; - init_callback_list(rdp); /* Re-enable callbacks on this CPU. */ + if (!rdp->nxtlist) + init_callback_list(rdp); /* Re-enable callbacks on this CPU. */ rdp->dynticks->dynticks_nesting = DYNTICK_TASK_EXIT_IDLE; rcu_sysidle_init_percpu_data(rdp->dynticks); atomic_set(&rdp->dynticks->dynticks, |