diff options
Diffstat (limited to 'debian/patches-rt/0023-EXP-rcu-Revert-expedited-GP-parallelization-cleverne.patch')
| -rw-r--r-- | debian/patches-rt/0023-EXP-rcu-Revert-expedited-GP-parallelization-cleverne.patch | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/debian/patches-rt/0023-EXP-rcu-Revert-expedited-GP-parallelization-cleverne.patch b/debian/patches-rt/0023-EXP-rcu-Revert-expedited-GP-parallelization-cleverne.patch new file mode 100644 index 000000000..576cef248 --- /dev/null +++ b/debian/patches-rt/0023-EXP-rcu-Revert-expedited-GP-parallelization-cleverne.patch @@ -0,0 +1,51 @@ +From 502b30371ea2dc6a5ba4ec401468053719944d93 Mon Sep 17 00:00:00 2001 +From: "Paul E. McKenney" <paulmck@linux.ibm.com> +Date: Mon, 29 Oct 2018 11:53:01 +0100 +Subject: [PATCH 023/347] EXP rcu: Revert expedited GP parallelization + cleverness +Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.19/older/patches-4.19.246-rt110.tar.xz + +(Commit 258ba8e089db23f760139266c232f01bad73f85c from linux-rcu) + +This commit reverts a series of commits starting with fcc635436501 ("rcu: +Make expedited GPs handle CPU 0 being offline") and its successors, thus +queueing each rcu_node structure's expedited grace-period initialization +work on the first CPU of that rcu_node structure. + +Suggested-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> +Signed-off-by: Paul E. McKenney <paulmck@linux.ibm.com> +Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> +--- + kernel/rcu/tree_exp.h | 9 +-------- + 1 file changed, 1 insertion(+), 8 deletions(-) + +diff --git a/kernel/rcu/tree_exp.h b/kernel/rcu/tree_exp.h +index 72770a551c24..ac6d6fdf5783 100644 +--- a/kernel/rcu/tree_exp.h ++++ b/kernel/rcu/tree_exp.h +@@ -472,7 +472,6 @@ static void sync_rcu_exp_select_node_cpus(struct work_struct *wp) + static void sync_rcu_exp_select_cpus(struct rcu_state *rsp, + smp_call_func_t func) + { +- int cpu; + struct rcu_node *rnp; + + trace_rcu_exp_grace_period(rsp->name, rcu_exp_gp_seq_endval(rsp), TPS("reset")); +@@ -494,13 +493,7 @@ static void sync_rcu_exp_select_cpus(struct rcu_state *rsp, + continue; + } + INIT_WORK(&rnp->rew.rew_work, sync_rcu_exp_select_node_cpus); +- preempt_disable(); +- cpu = cpumask_next(rnp->grplo - 1, cpu_online_mask); +- /* If all offline, queue the work on an unbound CPU. */ +- if (unlikely(cpu > rnp->grphi)) +- cpu = WORK_CPU_UNBOUND; +- queue_work_on(cpu, rcu_par_gp_wq, &rnp->rew.rew_work); +- preempt_enable(); ++ queue_work_on(rnp->grplo, rcu_par_gp_wq, &rnp->rew.rew_work); + rnp->exp_need_flush = true; + } + +-- +2.36.1 + |