linux-kernel - [PATCH rcu 1/6] genirq: Fix the return type of kstat_cpu_irqs

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Message-Id: <20230105005126.1772294-1-paulmck@kernel.org>
Date:   Wed,  4 Jan 2023 16:51:21 -0800
From:   "Paul E. McKenney" <paulmck@...nel.org>
To:     rcu@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, kernel-team@...a.com,
        rostedt@...dmis.org, Zhen Lei <thunder.leizhen@...wei.com>,
        Elliott@...lmck-ThinkPad-P17-Gen-1.home, Robert <elliott@....com>,
        Tejun Heo <tj@...nel.org>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        Josh Don <joshdon@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Frederic Weisbecker <frederic@...nel.org>,
        "Paul E . McKenney" <paulmck@...nel.org>
Subject: [PATCH rcu 1/6] genirq: Fix the return type of kstat_cpu_irqs_sum()

From: Zhen Lei <thunder.leizhen@...wei.com>

The type of member ->irqs_sum is unsigned long, but kstat_cpu_irqs_sum()
returns int, which can result in truncation.  Therefore, change the
kstat_cpu_irqs_sum() function's return value to unsigned long to avoid
truncation.

Fixes: f2c66cd8eedd ("/proc/stat: scalability of irq num per cpu")
Reported-by: Elliott, Robert (Servers) <elliott@....com>
Signed-off-by: Zhen Lei <thunder.leizhen@...wei.com>
Cc: Tejun Heo <tj@...nel.org>
Cc: "Peter Zijlstra (Intel)" <peterz@...radead.org>
Cc: Josh Don <joshdon@...gle.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Reviewed-by: Frederic Weisbecker <frederic@...nel.org>
Signed-off-by: Paul E. McKenney <paulmck@...nel.org>
---
 include/linux/kernel_stat.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/kernel_stat.h b/include/linux/kernel_stat.h
index ddb5a358fd829..90e2fdc17d79f 100644
--- a/include/linux/kernel_stat.h
+++ b/include/linux/kernel_stat.h
@@ -75,7 +75,7 @@ extern unsigned int kstat_irqs_usr(unsigned int irq);
 /*
  * Number of interrupts per cpu, since bootup
  */
-static inline unsigned int kstat_cpu_irqs_sum(unsigned int cpu)
+static inline unsigned long kstat_cpu_irqs_sum(unsigned int cpu)
 {
 	return kstat_cpu(cpu).irqs_sum;
 }
-- 
2.31.1.189.g2e36527f23