[SCSI] libsas: abstract STP task status into a function

[linux-2.6-omap-h63xx.git] / kernel / lockdep.c

diff --git a/kernel/lockdep.c b/kernel/lockdep.c
index 55fe0c7cd95fc6776dda4f93d85fa1541200ebb1..723bd9f9255687f7820b0e151ae23a3d5ca81e7b 100644 (file)
--- a/kernel/lockdep.c
+++ b/kernel/lockdep.c
@@ -2424,7 +2424,7 @@ static int __lock_acquire(struct lockdep_map *lock, unsigned int subclass,
                return 0;
 
        /*
-        * Calculate the chain hash: it's the combined has of all the
+        * Calculate the chain hash: it's the combined hash of all the
         * lock keys along the dependency chain. We save the hash value
         * at every step so that we can get the current hash easily
         * after unlock. The chain hash is then used to cache dependency
@@ -2654,10 +2654,15 @@ static void check_flags(unsigned long flags)
        if (!debug_locks)
                return;
 
-       if (irqs_disabled_flags(flags))
-               DEBUG_LOCKS_WARN_ON(current->hardirqs_enabled);
-       else
-               DEBUG_LOCKS_WARN_ON(!current->hardirqs_enabled);
+       if (irqs_disabled_flags(flags)) {
+               if (DEBUG_LOCKS_WARN_ON(current->hardirqs_enabled)) {
+                       printk("possible reason: unannotated irqs-off.\n");
+               }
+       } else {
+               if (DEBUG_LOCKS_WARN_ON(!current->hardirqs_enabled)) {
+                       printk("possible reason: unannotated irqs-on.\n");
+               }
+       }
 
        /*
         * We dont accurately track softirq state in e.g.
@@ -3054,11 +3059,6 @@ void __init lockdep_info(void)
 #endif
 }
 
-static inline int in_range(const void *start, const void *addr, const void *end)
-{
-       return addr >= start && addr <= end;
-}
-
 static void
 print_freed_lock_bug(struct task_struct *curr, const void *mem_from,
                     const void *mem_to, struct held_lock *hlock)
@@ -3080,6 +3080,13 @@ print_freed_lock_bug(struct task_struct *curr, const void *mem_from,
        dump_stack();
 }
 
+static inline int not_in_range(const void* mem_from, unsigned long mem_len,
+                               const void* lock_from, unsigned long lock_len)
+{
+       return lock_from + lock_len <= mem_from ||
+               mem_from + mem_len <= lock_from;
+}
+
 /*
  * Called when kernel memory is freed (or unmapped), or if a lock
  * is destroyed or reinitialized - this code checks whether there is
@@ -3087,7 +3094,6 @@ print_freed_lock_bug(struct task_struct *curr, const void *mem_from,
  */
 void debug_check_no_locks_freed(const void *mem_from, unsigned long mem_len)
 {
-       const void *mem_to = mem_from + mem_len, *lock_from, *lock_to;
        struct task_struct *curr = current;
        struct held_lock *hlock;
        unsigned long flags;
@@ -3100,14 +3106,11 @@ void debug_check_no_locks_freed(const void *mem_from, unsigned long mem_len)
        for (i = 0; i < curr->lockdep_depth; i++) {
                hlock = curr->held_locks + i;
 
-               lock_from = (void *)hlock->instance;
-               lock_to = (void *)(hlock->instance + 1);
-
-               if (!in_range(mem_from, lock_from, mem_to) &&
-                                       !in_range(mem_from, lock_to, mem_to))
+               if (not_in_range(mem_from, mem_len, hlock->instance,
+                                       sizeof(*hlock->instance)))
                        continue;
 
-               print_freed_lock_bug(curr, mem_from, mem_to, hlock);
+               print_freed_lock_bug(curr, mem_from, mem_from + mem_len, hlock);
                break;
        }
        local_irq_restore(flags);
@@ -3173,6 +3176,13 @@ retry:
                printk(" locked it.\n");
 
        do_each_thread(g, p) {
+               /*
+                * It's not reliable to print a task's held locks
+                * if it's not sleeping (or if it's not the current
+                * task):
+                */
+               if (p->state == TASK_RUNNING && p != current)
+                       continue;
                if (p->lockdep_depth)
                        lockdep_print_held_locks(p);
                if (!unlock)