linux-kernel - [PATCH] taskstats: Fix implicit type conversion

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Message-Id: <1635477247-1850773-1-git-send-email-jiasheng@iscas.ac.cn>
Date:   Fri, 29 Oct 2021 03:14:07 +0000
From:   Jiasheng Jiang <jiasheng@...as.ac.cn>
To:     bsingharora@...il.com
Cc:     linux-kernel@...r.kernel.org, Jiasheng Jiang <jiasheng@...as.ac.cn>
Subject: [PATCH] taskstats: Fix implicit type conversion

The variable 'cpu' is defined as unsigned int.
However in the for_each_cpu, its values is assigned to -1.
That doesn't make sense and in the cpumask_next() it is implicitly
type conversed to int.
It is universally accepted that the implicit type conversion is
terrible.
Also, having the good programming custom will set an example for
others.
Thus, it might be better to change the definition of 'cpu' from
unsigned int to int.

Signed-off-by: Jiasheng Jiang <jiasheng@...as.ac.cn>
---
 kernel/taskstats.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/taskstats.c b/kernel/taskstats.c
index 2b4898b..5d8d4e7 100644
--- a/kernel/taskstats.c
+++ b/kernel/taskstats.c
@@ -275,7 +275,7 @@ static int add_del_listener(pid_t pid, const struct cpumask *mask, int isadd)
 {
 	struct listener_list *listeners;
 	struct listener *s, *tmp, *s2;
-	unsigned int cpu;
+	int cpu;
 	int ret = 0;

 	if (!cpumask_subset(mask, cpu_possible_mask))
-- 
2.7.4