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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>
This commit is contained in:
Ingo Molnar 2018-05-30 07:55:39 +02:00
parent 13a553199f f64c6013a2
commit 52f2b34f46
5 changed files with 15 additions and 1 deletions
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4
arch/x86/kernel/cpu/mtrr/main.c
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@ -46,6 +46,7 @@
#include <linux/pci.h>
#include <linux/smp.h>
#include <linux/syscore_ops.h>
#include <linux/rcupdate.h>
#include <asm/cpufeature.h>
#include <asm/e820/api.h>
@ -793,6 +794,9 @@ void mtrr_ap_init(void)
if (!use_intel() || mtrr_aps_delayed_init)
return;
rcu_cpu_starting(smp_processor_id());
/*
* Ideally we should hold mtrr_mutex here to avoid mtrr entries
* changed, but this routine will be called in cpu boot time,

1
include/linux/rcupdate.h
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@ -108,7 +108,6 @@ void rcu_sched_qs(void);
void rcu_bh_qs(void);
void rcu_check_callbacks(int user);
void rcu_report_dead(unsigned int cpu);
void rcu_cpu_starting(unsigned int cpu);
void rcutree_migrate_callbacks(int cpu);
#ifdef CONFIG_RCU_STALL_COMMON

1
include/linux/rcutiny.h
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@ -132,5 +132,6 @@ static inline void rcu_all_qs(void) { barrier(); }
#define rcutree_offline_cpu NULL
#define rcutree_dead_cpu NULL
#define rcutree_dying_cpu NULL
static inline void rcu_cpu_starting(unsigned int cpu) { }
#endif /* __LINUX_RCUTINY_H */

1
include/linux/rcutree.h
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@ -101,5 +101,6 @@ int rcutree_online_cpu(unsigned int cpu);
int rcutree_offline_cpu(unsigned int cpu);
int rcutree_dead_cpu(unsigned int cpu);
int rcutree_dying_cpu(unsigned int cpu);
void rcu_cpu_starting(unsigned int cpu);
#endif /* __LINUX_RCUTREE_H */

9
kernel/rcu/tree.c
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@ -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. */