linux-kernel - [RFC v2 18/26] rcu: Make percpu rcu

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Message-Id: <1562855138-19507-19-git-send-email-alexandre.chartre@oracle.com>
Date:   Thu, 11 Jul 2019 16:25:30 +0200
From:   Alexandre Chartre <alexandre.chartre@...cle.com>
To:     pbonzini@...hat.com, rkrcmar@...hat.com, tglx@...utronix.de,
        mingo@...hat.com, bp@...en8.de, hpa@...or.com,
        dave.hansen@...ux.intel.com, luto@...nel.org, peterz@...radead.org,
        kvm@...r.kernel.org, x86@...nel.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Cc:     konrad.wilk@...cle.com, jan.setjeeilers@...cle.com,
        liran.alon@...cle.com, jwadams@...gle.com, graf@...zon.de,
        rppt@...ux.vnet.ibm.com, alexandre.chartre@...cle.com
Subject: [RFC v2 18/26] rcu: Make percpu rcu_data non-static

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@...cle.com>
---
 kernel/rcu/tree.c |    2 +-
 kernel/rcu/tree.h |    1 +
 2 files changed, 2 insertions(+), 1 deletions(-)

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);
-- 
1.7.1