linux-kernel - [PATCH rcu 3/8] rcu: Remove unused 'cpu' in rcu_virt_note_context

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Date:   Wed, 19 Oct 2022 15:46:54 -0700
From:   "Paul E. McKenney" <paulmck@...nel.org>
To:     rcu@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, kernel-team@...com,
        rostedt@...dmis.org, Zeng Heng <zengheng4@...wei.com>,
        Mukesh Ojha <quic_mojha@...cinc.com>,
        "Paul E . McKenney" <paulmck@...nel.org>
Subject: [PATCH rcu 3/8] rcu: Remove unused 'cpu' in rcu_virt_note_context_switch()

From: Zeng Heng <zengheng4@...wei.com>

This commit removes the unused function argument 'cpu'.  This does not
change functionality, but might save a cycle or two.

Signed-off-by: Zeng Heng <zengheng4@...wei.com>
Acked-by: Mukesh Ojha <quic_mojha@...cinc.com>
Signed-off-by: Paul E. McKenney <paulmck@...nel.org>
---
 include/linux/kvm_host.h | 2 +-
 include/linux/rcutiny.h  | 2 +-
 include/linux/rcutree.h  | 2 +-
 3 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index 32f259fa58013..381b92d146c71 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -416,7 +416,7 @@ static __always_inline void guest_context_enter_irqoff(void)
 	 */
 	if (!context_tracking_guest_enter()) {
 		instrumentation_begin();
-		rcu_virt_note_context_switch(smp_processor_id());
+		rcu_virt_note_context_switch();
 		instrumentation_end();
 	}
 }
diff --git a/include/linux/rcutiny.h b/include/linux/rcutiny.h
index 768196a5f39d6..9bc025aa79a30 100644
--- a/include/linux/rcutiny.h
+++ b/include/linux/rcutiny.h
@@ -142,7 +142,7 @@ static inline int rcu_needs_cpu(void)
  * Take advantage of the fact that there is only one CPU, which
  * allows us to ignore virtualization-based context switches.
  */
-static inline void rcu_virt_note_context_switch(int cpu) { }
+static inline void rcu_virt_note_context_switch(void) { }
 static inline void rcu_cpu_stall_reset(void) { }
 static inline int rcu_jiffies_till_stall_check(void) { return 21 * HZ; }
 static inline void rcu_irq_exit_check_preempt(void) { }
diff --git a/include/linux/rcutree.h b/include/linux/rcutree.h
index 5efb51486e8af..70795386b9ffa 100644
--- a/include/linux/rcutree.h
+++ b/include/linux/rcutree.h
@@ -27,7 +27,7 @@ void rcu_cpu_stall_reset(void);
  * wrapper around rcu_note_context_switch(), which allows TINY_RCU
  * to save a few bytes. The caller must have disabled interrupts.
  */
-static inline void rcu_virt_note_context_switch(int cpu)
+static inline void rcu_virt_note_context_switch(void)
 {
 	rcu_note_context_switch(false);
 }
-- 
2.31.1.189.g2e36527f23