x86: Do not free zero sized per cpu areas

[safe/jmp/linux-2.6] / kernel / sched.c

diff --git a/kernel/sched.c b/kernel/sched.c
index abb36b1..49d2fa7 100644 (file)
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -2359,7 +2359,7 @@ static int try_to_wake_up(struct task_struct *p, unsigned int state,
 {
        int cpu, orig_cpu, this_cpu, success = 0;
        unsigned long flags;
-       struct rq *rq, *orig_rq;
+       struct rq *rq;
 
        if (!sched_feat(SYNC_WAKEUPS))
                wake_flags &= ~WF_SYNC;
@@ -2367,7 +2367,7 @@ static int try_to_wake_up(struct task_struct *p, unsigned int state,
        this_cpu = get_cpu();
 
        smp_wmb();
-       rq = orig_rq = task_rq_lock(p, &flags);
+       rq = task_rq_lock(p, &flags);
        update_rq_clock(rq);
        if (!(p->state & state))
                goto out;
@@ -2650,7 +2650,7 @@ void wake_up_new_task(struct task_struct *p, unsigned long clone_flags)
 {
        unsigned long flags;
        struct rq *rq;
-       int cpu = get_cpu();
+       int cpu __maybe_unused = get_cpu();
 
 #ifdef CONFIG_SMP
        /*
@@ -4353,7 +4353,7 @@ int can_nice(const struct task_struct *p, const int nice)
        /* convert nice value [19,-20] to rlimit style value [1,40] */
        int nice_rlim = 20 - nice;
 
-       return (nice_rlim <= p->signal->rlim[RLIMIT_NICE].rlim_cur ||
+       return (nice_rlim <= task_rlimit(p, RLIMIT_NICE) ||
                capable(CAP_SYS_NICE));
 }
 
@@ -4530,7 +4530,7 @@ recheck:
 
                        if (!lock_task_sighand(p, &flags))
                                return -ESRCH;
-                       rlim_rtprio = p->signal->rlim[RLIMIT_RTPRIO].rlim_cur;
+                       rlim_rtprio = task_rlimit(p, RLIMIT_RTPRIO);
                        unlock_task_sighand(p, &flags);
 
                        /* can't set/change the rt policy */
@@ -4902,7 +4902,9 @@ SYSCALL_DEFINE3(sched_getaffinity, pid_t, pid, unsigned int, len,
        int ret;
        cpumask_var_t mask;
 
-       if (len < cpumask_size())
+       if (len < nr_cpu_ids)
+               return -EINVAL;
+       if (len & (sizeof(unsigned long)-1))
                return -EINVAL;
 
        if (!alloc_cpumask_var(&mask, GFP_KERNEL))
@@ -4910,10 +4912,12 @@ SYSCALL_DEFINE3(sched_getaffinity, pid_t, pid, unsigned int, len,
 
        ret = sched_getaffinity(pid, mask);
        if (ret == 0) {
-               if (copy_to_user(user_mask_ptr, mask, cpumask_size()))
+               size_t retlen = min_t(size_t, len, cpumask_size());
+
+               if (copy_to_user(user_mask_ptr, mask, retlen))
                        ret = -EFAULT;
                else
-                       ret = cpumask_size();
+                       ret = retlen;
        }
        free_cpumask_var(mask);
 
@@ -7406,11 +7410,13 @@ static ssize_t sched_power_savings_store(const char *buf, size_t count, int smt)
 
 #ifdef CONFIG_SCHED_MC
 static ssize_t sched_mc_power_savings_show(struct sysdev_class *class,
+                                          struct sysdev_class_attribute *attr,
                                           char *page)
 {
        return sprintf(page, "%u\n", sched_mc_power_savings);
 }
 static ssize_t sched_mc_power_savings_store(struct sysdev_class *class,
+                                           struct sysdev_class_attribute *attr,
                                            const char *buf, size_t count)
 {
        return sched_power_savings_store(buf, count, 0);
@@ -7422,11 +7428,13 @@ static SYSDEV_CLASS_ATTR(sched_mc_power_savings, 0644,
 
 #ifdef CONFIG_SCHED_SMT
 static ssize_t sched_smt_power_savings_show(struct sysdev_class *dev,
+                                           struct sysdev_class_attribute *attr,
                                            char *page)
 {
        return sprintf(page, "%u\n", sched_smt_power_savings);
 }
 static ssize_t sched_smt_power_savings_store(struct sysdev_class *dev,
+                                            struct sysdev_class_attribute *attr,
                                             const char *buf, size_t count)
 {
        return sched_power_savings_store(buf, count, 1);