linux-kernel - [PATCH] cpuset: Remove unused 'struct cpuset*' variable

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Date:   Thu, 24 Nov 2016 20:55:12 -0800
From:   Kirtika Ruchandani <kirtika@...omium.org>
To:     tj@...nel.org, Li Zefan <lizefan@...wei.com>
Cc:     Kirtika Ruchandani <kirtika@...omium.org>, arnd@...db.de,
        cgroups@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] cpuset: Remove unused 'struct cpuset*' variable

'struct cpuset* cs' that is set but not used, was introduced in commit
1f7dd3e5a6e4 ("cgroup: fix handling of multi-destination migration from subtree_control enabling").
cpuset_cancel_attach() uses css_cs(css) instead. Compiling with W=1
gives the folllowing harmless warning, which we'd like to fix to
reduce the noise with W=1 in the kernel.

kernel/cpuset.c: In function ‘cpuset_cancel_attach’:
kernel/cpuset.c:1502:17: warning: variable ‘cs’ set but not used [-Wunused-but-set-variable]
  struct cpuset *cs;
                 ^

Fixes: 1f7dd3e5a6e4 ("cgroup: fix handling of multi-destination migration from subtree_control enabling").
Cc: Tejun Heo <tj@...nel.org>
Signed-off-by: Kirtika Ruchandani <kirtika@...omium.org>
---
 kernel/cpuset.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/kernel/cpuset.c b/kernel/cpuset.c
index 29f815d..af51460 100644
--- a/kernel/cpuset.c
+++ b/kernel/cpuset.c
@@ -1499,10 +1499,8 @@ static int cpuset_can_attach(struct cgroup_taskset *tset)
 static void cpuset_cancel_attach(struct cgroup_taskset *tset)
 {
 	struct cgroup_subsys_state *css;
-	struct cpuset *cs;
 
 	cgroup_taskset_first(tset, &css);
-	cs = css_cs(css);
 
 	mutex_lock(&cpuset_mutex);
 	css_cs(css)->attach_in_progress--;
-- 
2.8.0.rc3.226.g39d4020