linux-kernel - [PATCH v4] sched/core: silence a warning in sched

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-Id: <20190720012319.884-1-cai@lca.pw>
Date:   Fri, 19 Jul 2019 21:23:19 -0400
From:   Qian Cai <cai@....pw>
To:     mingo@...hat.com, peterz@...radead.org
Cc:     valentin.schneider@....com, linux-kernel@...r.kernel.org,
        Qian Cai <cai@....pw>
Subject: [PATCH v4] sched/core: silence a warning in sched_init()

Compiling a kernel with both FAIR_GROUP_SCHED=n and RT_GROUP_SCHED=n
will generate a compiler warning,

kernel/sched/core.c: In function 'sched_init':
kernel/sched/core.c:5906:32: warning: variable 'ptr' set but not used
[-Wunused-but-set-variable]
 unsigned long alloc_size = 0, ptr;
                               ^~~
It is unnecessary to have both "alloc_size" and "ptr", so just combine
them.

Signed-off-by: Qian Cai <cai@....pw>
---

v4: Combine "alloc_size" and "ptr" together.
v3: Use a different approach to see if Peter will like it.
v2: Incorporate the feedback from Valentin.

 kernel/sched/core.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 2b037f195473..6eefaeea4c88 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -6371,19 +6371,19 @@ DECLARE_PER_CPU(cpumask_var_t, select_idle_mask);
 
 void __init sched_init(void)
 {
-	unsigned long alloc_size = 0, ptr;
+	unsigned long ptr = 0;
 	int i;
 
 	wait_bit_init();
 
 #ifdef CONFIG_FAIR_GROUP_SCHED
-	alloc_size += 2 * nr_cpu_ids * sizeof(void **);
+	ptr += 2 * nr_cpu_ids * sizeof(void **);
 #endif
 #ifdef CONFIG_RT_GROUP_SCHED
-	alloc_size += 2 * nr_cpu_ids * sizeof(void **);
+	ptr += 2 * nr_cpu_ids * sizeof(void **);
 #endif
-	if (alloc_size) {
-		ptr = (unsigned long)kzalloc(alloc_size, GFP_NOWAIT);
+	if (ptr) {
+		ptr = (unsigned long)kzalloc(ptr, GFP_NOWAIT);
 
 #ifdef CONFIG_FAIR_GROUP_SCHED
 		root_task_group.se = (struct sched_entity **)ptr;
-- 
2.20.1 (Apple Git-117)