----- Original Message -----
> From: "Paul E. McKenney" <paul...@linux.vnet.ibm.com>
> To: linux-kernel@vger.kernel.org
> Cc: mi...@kernel.org, la...@cn.fujitsu.com, dipan...@in.ibm.com,
> a...@linux-foundation.org, "mathieu desnoyers"
> <mathieu.desnoy...@efficios.com>, j...@joshtriplett.org, t...@linutronix.de,
> pet...@infradead.org,
> rost...@goodmis.org, dhowe...@redhat.com, eduma...@google.com,
> dvh...@linux.intel.com, fweis...@gmail.com,
> o...@redhat.com, "bobby prani" <bobby.pr...@gmail.com>, "Paul E. McKenney"
> <paul...@linux.vnet.ibm.com>
> Sent: Tuesday, March 3, 2015 11:45:47 AM
> Subject: [PATCH tip/core/rcu 6/7] rcu: Move early-boot callbacks to no-CBs
> lists for no-CBs CPUs
>
> From: "Paul E. McKenney" <paul...@linux.vnet.ibm.com>
>
> When a CPU is first determined to be a no-CBs CPUs, this commit causes
> any early boot callbacks to be moved to the no-CBs callback list,
> allowing them t obe invoked.
^^^^^
out-of-order space ;)
Thanks,
Mathieu
>
> Signed-off-by: Paul E. McKenney <paul...@linux.vnet.ibm.com>
> ---
> kernel/rcu/tree.c | 1 +
> kernel/rcu/tree_plugin.h | 24 ++++++++++++------------
> 2 files changed, 13 insertions(+), 12 deletions(-)
>
> diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
> index 92fd3eab5823..0317bf7d997f 100644
> --- a/kernel/rcu/tree.c
> +++ b/kernel/rcu/tree.c
> @@ -2851,6 +2851,7 @@ __call_rcu(struct rcu_head *head, void (*func)(struct
> rcu_head *rcu),
> * and then drop through to queue the callback.
> */
> BUG_ON(cpu != -1);
> + WARN_ON_ONCE(!rcu_is_watching());
> if (!likely(rdp->nxtlist))
> init_default_callback_list(rdp);
> }
> diff --git a/kernel/rcu/tree_plugin.h b/kernel/rcu/tree_plugin.h
> index 75d5f096bcb0..afddd5641bea 100644
> --- a/kernel/rcu/tree_plugin.h
> +++ b/kernel/rcu/tree_plugin.h
> @@ -2393,18 +2393,8 @@ void __init rcu_init_nohz(void)
> pr_info("\tPoll for callbacks from no-CBs CPUs.\n");
>
> for_each_rcu_flavor(rsp) {
> - for_each_cpu(cpu, rcu_nocb_mask) {
> - struct rcu_data *rdp = per_cpu_ptr(rsp->rda, cpu);
> -
> - /*
> - * If there are early callbacks, they will need
> - * to be moved to the nocb lists.
> - */
> - WARN_ON_ONCE(rdp->nxttail[RCU_NEXT_TAIL] !=
> - &rdp->nxtlist &&
> - rdp->nxttail[RCU_NEXT_TAIL] != NULL);
> - init_nocb_callback_list(rdp);
> - }
> + for_each_cpu(cpu, rcu_nocb_mask)
> + init_nocb_callback_list(per_cpu_ptr(rsp->rda, cpu));
> rcu_organize_nocb_kthreads(rsp);
> }
> }
> @@ -2541,6 +2531,16 @@ static bool init_nocb_callback_list(struct rcu_data
> *rdp)
> if (!rcu_is_nocb_cpu(rdp->cpu))
> return false;
>
> + /* If there are early-boot callbacks, move them to nocb lists. */
> + if (rdp->nxtlist) {
> + rdp->nocb_head = rdp->nxtlist;
> + rdp->nocb_tail = rdp->nxttail[RCU_NEXT_TAIL];
> + atomic_long_set(&rdp->nocb_q_count, rdp->qlen);
> + atomic_long_set(&rdp->nocb_q_count_lazy, rdp->qlen_lazy);
> + rdp->nxtlist = NULL;
> + rdp->qlen = 0;
> + rdp->qlen_lazy = 0;
> + }
> rdp->nxttail[RCU_NEXT_TAIL] = NULL;
> return true;
> }
> --
> 1.8.1.5
>
>
--
Mathieu Desnoyers
EfficiOS Inc.
http://www.efficios.com
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