kernel/taskstats.c: return -ENOMEM when alloc memory fails in add_del_listener()

For registering in add_del_listener(), when kmalloc_node() fails, need
return -ENOMEM instead of success code, and cmd_attr_register_cpumask()
wants to know about it.

After modification, give a simple common test "build -> boot up ->
kernel/controllers/cgroup/getdelays by LTP tools".

Signed-off-by: Chen Gang <gang.chen@asianux.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/kernel/taskstats.c b/kernel/taskstats.c
index 1db6808..9f4618e 100644 (file)
--- a/kernel/taskstats.c
+++ b/kernel/taskstats.c
@@ -290,6 +290,7 @@ 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 ret = 0;
 
        if (!cpumask_subset(mask, cpu_possible_mask))
                return -EINVAL;
@@ -304,9 +305,10 @@ static int add_del_listener(pid_t pid, const struct cpumask *mask, int isadd)
                for_each_cpu(cpu, mask) {
                        s = kmalloc_node(sizeof(struct listener),
                                        GFP_KERNEL, cpu_to_node(cpu));
-                       if (!s)
+                       if (!s) {
+                               ret = -ENOMEM;
                                goto cleanup;
-
+                       }
                        s->pid = pid;
                        s->valid = 1;
 
@@ -339,7 +341,7 @@ cleanup:
                }
                up_write(&listeners->sem);
        }
-       return 0;
+       return ret;
 }
 
 static int parse(struct nlattr *na, struct cpumask *mask)