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| author |  Ingo Molnar <mingo@kernel.org>
| 2018-05-30 07:55:39 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org>
| 2018-05-30 07:55:39 +0200 |
| commit | 52f2b34f46223ca2789320fa10c13f6664c1b628 (patch) | |
| tree | 28c597a8d38898c7807a19a4ec128777e3b90964 /kernel | |
| parent | Merge branch 'for-mingo' of git://git.kernel.org/pub/scm/linux/kernel/git/pau... (diff) | |
| parent | rcu/x86: Provide early rcu_cpu_starting() callback (diff) | |
| download | linux-52f2b34f46223ca2789320fa10c13f6664c1b628.tar.gz linux-52f2b34f46223ca2789320fa10c13f6664c1b628.tar.bz2 linux-52f2b34f46223ca2789320fa10c13f6664c1b628.zip | |
Merge branch 'for-mingo' of git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu into core/rcu
Pull RCU fix from Paul E. McKenney:
"This additional v4.18 pull request contains a single commit that fell
through the cracks:
Provide early rcu_cpu_starting() callback for the benefit of the
x86/mtrr code, which needs RCU to be available on incoming CPUs
earlier than has been the case in the past."
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/rcu/tree.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c index 4fccdfa25716..aa7cade1b9f3 100644 --- a/kernel/rcu/tree.c +++ b/kernel/rcu/tree.c @@ -3665,6 +3665,8 @@ int rcutree_dead_cpu(unsigned int cpu) return 0; } +static DEFINE_PER_CPU(int, rcu_cpu_started); + /* * Mark the specified CPU as being online so that subsequent grace periods * (both expedited and normal) will wait on it. Note that this means that @@ -3686,6 +3688,11 @@ void rcu_cpu_starting(unsigned int cpu) struct rcu_node *rnp; struct rcu_state *rsp; + if (per_cpu(rcu_cpu_started, cpu)) + return; + + per_cpu(rcu_cpu_started, cpu) = 1; + for_each_rcu_flavor(rsp) { rdp = per_cpu_ptr(rsp->rda, cpu); rnp = rdp->mynode; @@ -3742,6 +3749,8 @@ void rcu_report_dead(unsigned int cpu) preempt_enable(); for_each_rcu_flavor(rsp) rcu_cleanup_dying_idle_cpu(cpu, rsp); + + per_cpu(rcu_cpu_started, cpu) = 0; } /* Migrate the dead CPU's callbacks to the current CPU. */ |