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[RFC,v2,18/26] rcu: Make percpu rcu_data non-static

Message ID 1562855138-19507-19-git-send-email-alexandre.chartre@oracle.com (mailing list archive)
State New, archived
Headers show
Series Kernel Address Space Isolation | expand

Commit Message

Alexandre Chartre July 11, 2019, 2:25 p.m. UTC 
Make percpu rcu_data non-static so that it can be mapped into an
isolation address space page-table. This will allow address space
isolation to use RCU without faulting.

Signed-off-by: Alexandre Chartre <alexandre.chartre@oracle.com>
---
 kernel/rcu/tree.c |    2 +-
 kernel/rcu/tree.h |    1 +
 2 files changed, 2 insertions(+), 1 deletions(-)
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Patch

diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index 44dd3b4..2827b2b 100644
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c
@@ -126,7 +126,7 @@  static void rcu_check_gp_start_stall(struct rcu_node *rnp, struct rcu_data *rdp,
 #define rcu_eqs_special_exit() do { } while (0)
 #endif
 
-static DEFINE_PER_CPU_SHARED_ALIGNED(struct rcu_data, rcu_data) = {
+DEFINE_PER_CPU_SHARED_ALIGNED(struct rcu_data, rcu_data) = {
 	.dynticks_nesting = 1,
 	.dynticks_nmi_nesting = DYNTICK_IRQ_NONIDLE,
 	.dynticks = ATOMIC_INIT(RCU_DYNTICK_CTRL_CTR),
diff --git a/kernel/rcu/tree.h b/kernel/rcu/tree.h
index 9790b58..a043fde 100644
--- a/kernel/rcu/tree.h
+++ b/kernel/rcu/tree.h
@@ -394,3 +394,4 @@  struct rcu_state {
 int rcu_dynticks_snap(struct rcu_data *rdp);
 void call_rcu(struct rcu_head *head, rcu_callback_t func);
 
+DECLARE_PER_CPU_SHARED_ALIGNED(struct rcu_data, rcu_data);