linux-kernel - [PATCH v4 1/2] smp: Introduce a helper function to check for pending IPIs

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Message-ID: <20251105095415.17269-2-ulf.hansson@linaro.org>
Date: Wed,  5 Nov 2025 10:54:07 +0100
From: Ulf Hansson <ulf.hansson@...aro.org>
To: "Rafael J . Wysocki" <rafael@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>
Cc: Mark Rutland <mark.rutland@....com>,
	Marc Zyngier <maz@...nel.org>,
	Maulik Shah <quic_mkshah@...cinc.com>,
	Sudeep Holla <sudeep.holla@....com>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	Vincent Guittot <vincent.guittot@...aro.org>,
	Ben Horgan <ben.horgan@....com>,
	linux-pm@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	Ulf Hansson <ulf.hansson@...aro.org>
Subject: [PATCH v4 1/2] smp: Introduce a helper function to check for pending IPIs

When governors used during cpuidle try to find the most optimal idle state
for a CPU or a group of CPUs, they are known to quite often fail. One
reason for this is, that they are not taking into account whether there has
been an IPI scheduled for any of the CPUs that are affected by the selected
idle state.

To enable pending IPIs to be taken into account for cpuidle decisions,
introduce a new helper function, cpus_peek_for_pending_ipi().

Suggested-by: Thomas Gleixner <tglx@...utronix.de>
Signed-off-by: Ulf Hansson <ulf.hansson@...aro.org>
---

Changes in v4:
	- Updated the description of the helper function.
	- Fixed whitespace.

Changes in v3:
	- Renamed the helper function and updated its description.
	- Updated the commit message.

Changes in v2:
	- Implemented a common function, rather than making it arch-specific. As
	suggested by Thomas and Marc.
	- Renamed the function to indicate that it doesn't provide correctness.
	- Clarified function description and commit message.

---
 include/linux/smp.h |  5 +++++
 kernel/smp.c        | 22 ++++++++++++++++++++++
 2 files changed, 27 insertions(+)

diff --git a/include/linux/smp.h b/include/linux/smp.h
index 18e9c918325e..91d0ecf3b8d3 100644
--- a/include/linux/smp.h
+++ b/include/linux/smp.h
@@ -168,6 +168,7 @@ int smp_call_function_any(const struct cpumask *mask,
 
 void kick_all_cpus_sync(void);
 void wake_up_all_idle_cpus(void);
+bool cpus_peek_for_pending_ipi(const struct cpumask *mask);
 
 /*
  * Generic and arch helpers
@@ -216,6 +217,10 @@ smp_call_function_any(const struct cpumask *mask, smp_call_func_t func,
 
 static inline void kick_all_cpus_sync(void) {  }
 static inline void wake_up_all_idle_cpus(void) {  }
+static inline bool cpus_peek_for_pending_ipi(const struct cpumask *mask)
+{
+	return false;
+}
 
 #define setup_max_cpus 0
 
diff --git a/kernel/smp.c b/kernel/smp.c
index 02f52291fae4..f349960f79ca 100644
--- a/kernel/smp.c
+++ b/kernel/smp.c
@@ -1087,6 +1087,28 @@ void wake_up_all_idle_cpus(void)
 }
 EXPORT_SYMBOL_GPL(wake_up_all_idle_cpus);
 
+/**
+ * cpus_peek_for_pending_ipi - Check for pending IPI for CPUs
+ * @mask: The CPU mask for the CPUs to check.
+ *
+ * This function walks through the @mask to check if there are any pending IPIs
+ * scheduled, for any of the CPUs in the @mask. It does not guarantee
+ * correctness as it only provides a racy snapshot.
+ *
+ * Returns true if there is a pending IPI scheduled and false otherwise.
+ */
+bool cpus_peek_for_pending_ipi(const struct cpumask *mask)
+{
+	unsigned int cpu;
+
+	for_each_cpu(cpu, mask) {
+		if (!llist_empty(per_cpu_ptr(&call_single_queue, cpu)))
+			return true;
+	}
+
+	return false;
+}
+
 /**
  * struct smp_call_on_cpu_struct - Call a function on a specific CPU
  * @work: &work_struct
-- 
2.43.0