From 6494ccb93271bee596a12db32ff44867d5be2321 Mon Sep 17 00:00:00 2001 From: Zhouyi Zhou Date: Mon, 11 Jan 2021 09:08:59 +0800 Subject: [PATCH] rcu: Remove spurious instrumentation_end() in rcu_nmi_enter() In rcu_nmi_enter(), there is an erroneous instrumentation_end() in the second branch of the "if" statement. Oddly enough, "objtool check -f vmlinux.o" fails to complain because it is unable to correctly cover all cases. Instead, objtool visits the third branch first, which marks following trace_rcu_dyntick() as visited. This commit therefore removes the spurious instrumentation_end(). Fixes: 04b25a495bd6 ("rcu: Mark rcu_nmi_enter() call to rcu_cleanup_after_idle() noinstr") Reported-by Neeraj Upadhyay Signed-off-by: Zhouyi Zhou Signed-off-by: Paul E. McKenney --- kernel/rcu/tree.c | 1 - 1 file changed, 1 deletion(-) diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c index e62c2defae987..4d90f202ef4a6 100644 --- a/kernel/rcu/tree.c +++ b/kernel/rcu/tree.c @@ -1076,7 +1076,6 @@ noinstr void rcu_nmi_enter(void) } else if (!in_nmi()) { instrumentation_begin(); rcu_irq_enter_check_tick(); - instrumentation_end(); } else { instrumentation_begin(); } -- 2.30.2