From: Peter Zijlstra <peterz@infradead.org>
Date: Tue, 28 Sep 2021 08:40:22 +0000 (+0200)
Subject: rcu: Fix rcu_dynticks_curr_cpu_in_eqs() vs noinstr
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=d846b69dc7ffca2042428cd46b323fed4ce6a801;p=linux.git

rcu: Fix rcu_dynticks_curr_cpu_in_eqs() vs noinstr

[ Upstream commit 74aece72f95f399dd29363669dc32a1344c8fab4 ]

  vmlinux.o: warning: objtool: rcu_nmi_enter()+0x36: call to __kasan_check_read() leaves .noinstr.text section

noinstr cannot have atomic_*() functions in because they're explicitly
annotated, use arch_atomic_*().

Fixes: 2be57f732889 ("rcu: Weaken ->dynticks accesses and updates")
Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---

diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index bce848e50512e..bdd1dc6de71ab 100644
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c
@@ -327,7 +327,7 @@ static void rcu_dynticks_eqs_online(void)
  */
 static __always_inline bool rcu_dynticks_curr_cpu_in_eqs(void)
 {
-	return !(atomic_read(this_cpu_ptr(&rcu_data.dynticks)) & 0x1);
+	return !(arch_atomic_read(this_cpu_ptr(&rcu_data.dynticks)) & 0x1);
 }
 
 /*