linux-kernel - [PATCH] event/core.c: fix warning format specifier to use %llu instead of %lld for u64 values.

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Message-ID: <20250729070620.527482-1-seokwoo.chung130@gmail.com>
Date: Tue, 29 Jul 2025 16:06:03 +0900
From: Ryan Chung <seokwoo.chung130@...il.com>
To: peterz@...radead.org,
	mingo@...hat.com,
	acme@...nel.org,
	namhyung@...nel.org
Cc: mark.rutland@....com,
	alexander.shishkin@...ux.intel.com,
	jolsa@...nel.org,
	irogers@...gle.com,
	adrian.hunter@...el.com,
	kan.liang@...ux.intel.com,
	linux-perf-users@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Ryan Chung <seokwoo.chung130@...il.com>
Subject: [PATCH] event/core.c: fix warning format specifier to use %llu instead of %lld for u64 values.

Updates the perf duration warning to use the unsigned 64‑bit format specifier `%llu` instead of `%lld`, ensuring the format matches the `u64` types.

No functional change intended.

Signed-off-by: Ryan Chung <seokwoo.chung130@...il.com>
---
 kernel/events/core.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/kernel/events/core.c b/kernel/events/core.c
index 22fdf0c187cd..b8d7c4a64c44 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -602,7 +602,7 @@ static u64 __report_allowed;
 static void perf_duration_warn(struct irq_work *w)
 {
 	printk_ratelimited(KERN_INFO
-		"perf: interrupt took too long (%lld > %lld), lowering "
+		"perf: interrupt took too long (%llu > %llu), lowering "
 		"kernel.perf_event_max_sample_rate to %d\n",
 		__report_avg, __report_allowed,
 		sysctl_perf_event_sample_rate);
@@ -655,7 +655,7 @@ void perf_sample_event_took(u64 sample_len_ns)
 	perf_sample_period_ns = NSEC_PER_SEC / sysctl_perf_event_sample_rate;
 
 	if (!irq_work_queue(&perf_duration_work)) {
-		early_printk("perf: interrupt took too long (%lld > %lld), lowering "
+		early_printk("perf: interrupt took too long (%llu > %llu), lowering "
 			     "kernel.perf_event_max_sample_rate to %d\n",
 			     __report_avg, __report_allowed,
 			     sysctl_perf_event_sample_rate);
-- 
2.43.0