[PATCH] lockdep: annotate timer base locks

Split the per-CPU timer base locks up into separate lock classes, because they
are used recursively.

Has no effect on non-lockdep kernels.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 9 insertions, 0 deletions

diff --git a/kernel/timer.c b/kernel/timer.c
index 4dd9a10d67d..b761898d04c 100644
--- a/kernel/timer.c
+++ b/kernel/timer.c
@@ -1559,6 +1559,13 @@ asmlinkage long sys_sysinfo(struct sysinfo __user *info)
         return 0;
 }
 
+/*
+ * lockdep: we want to track each per-CPU base as a separate lock-class,
+ * but timer-bases are kmalloc()-ed, so we need to attach separate
+ * keys to them:
+ */
+static struct lock_class_key base_lock_keys[NR_CPUS];
+
 static int __devinit init_timers_cpu(int cpu)
 {
         int j;
@@ -1594,6 +1601,8 @@ static int __devinit init_timers_cpu(int cpu)
         }
 
         spin_lock_init(&base->lock);
+        lockdep_set_class(&base->lock, base_lock_keys + cpu);
+
         for (j = 0; j < TVN_SIZE; j++) {
                 INIT_LIST_HEAD(base->tv5.vec + j);
                 INIT_LIST_HEAD(base->tv4.vec + j);