[PATCH] fix MAX_USER_RT_PRIO and MAX_RT_PRIO

Here's the patch again to fix the code to handle if the values between
MAX_USER_RT_PRIO and MAX_RT_PRIO are different.

Without this patch, an SMP system will crash if the values are
different.

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Dean Nelson <dcn@sgi.com>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

2 files changed, 4 insertions, 3 deletions

diff --git a/arch/ia64/sn/kernel/xpc_main.c b/arch/ia64/sn/kernel/xpc_main.c
index d580adcad927..bb1d5cf30440 100644
--- a/arch/ia64/sn/kernel/xpc_main.c
+++ b/arch/ia64/sn/kernel/xpc_main.c
@@ -420,7 +420,7 @@ xpc_activating(void *__partid)
         partid_t partid = (u64) __partid;
         struct xpc_partition *part = &xpc_partitions[partid];
         unsigned long irq_flags;
-        struct sched_param param = { sched_priority: MAX_USER_RT_PRIO - 1 };
+        struct sched_param param = { sched_priority: MAX_RT_PRIO - 1 };
         int ret;
 
 
diff --git a/kernel/sched.c b/kernel/sched.c
index a5fb654ea590..a646e4f36c41 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -3486,7 +3486,7 @@ static void __setscheduler(struct task_struct *p, int policy, int prio)
         p->policy = policy;
         p->rt_priority = prio;
         if (policy != SCHED_NORMAL)
-                p->prio = MAX_USER_RT_PRIO-1 - p->rt_priority;
+                p->prio = MAX_RT_PRIO-1 - p->rt_priority;
         else
                 p->prio = p->static_prio;
 }
@@ -3518,7 +3518,8 @@ recheck:
          * 1..MAX_USER_RT_PRIO-1, valid priority for SCHED_NORMAL is 0.
          */
         if (param->sched_priority < 0 ||
-            param->sched_priority > MAX_USER_RT_PRIO-1)
+            (p->mm &&  param->sched_priority > MAX_USER_RT_PRIO-1) ||
+            (!p->mm && param->sched_priority > MAX_RT_PRIO-1))
                 return -EINVAL;
         if ((policy == SCHED_NORMAL) != (param->sched_priority == 0))
                 return -EINVAL;