lockdep: merge the _READ mark_lock_irq() helpers
The _READ helpers show remarkable similarity, merge them.
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/kernel/lockdep.c b/kernel/lockdep.c
index e0a027d..2d95f9d 100644
--- a/kernel/lockdep.c
+++ b/kernel/lockdep.c
@@ -2091,22 +2091,34 @@
}
static int
-mark_lock_irq_used_in_read(struct task_struct *curr, struct held_lock *this,
+mark_lock_irq_read(struct task_struct *curr, struct held_lock *this,
int new_bit)
{
const char *name = state_name(new_bit);
const char *rname = state_rname(new_bit);
int excl_bit = exclusive_bit(new_bit);
+ int dir = new_bit & 2;
if (!valid_state(curr, this, new_bit, excl_bit))
return 0;
- /*
- * just marked it hardirq-read-safe, check that this lock
- * took no hardirq-unsafe lock in the past:
- */
- if (!check_usage_forwards(curr, this, excl_bit, name))
- return 0;
+
+ if (!dir) {
+ /*
+ * just marked it hardirq-read-safe, check that this lock
+ * took no hardirq-unsafe lock in the past:
+ */
+ if (!check_usage_forwards(curr, this, excl_bit, name))
+ return 0;
+ } else if (STRICT_READ_CHECKS) {
+ /*
+ * just marked it hardirq-read-unsafe, check that no
+ * hardirq-safe lock in the system ever took it in the past:
+ */
+ if (!check_usage_backwards(curr, this, excl_bit, name))
+ return 0;
+ }
+
if (state_verbose(new_bit, hlock_class(this)))
return 2;
@@ -2147,31 +2159,6 @@
return 1;
}
-static int
-mark_lock_irq_enabled_read(struct task_struct *curr, struct held_lock *this,
- int new_bit)
-{
- const char *name = state_name(new_bit);
- const char *rname = state_rname(new_bit);
-
- int excl_bit = exclusive_bit(new_bit);
-
- if (!valid_state(curr, this, new_bit, excl_bit))
- return 0;
-#if STRICT_READ_CHECKS
- /*
- * just marked it hardirq-read-unsafe, check that no
- * hardirq-safe lock in the system ever took it in the past:
- */
- if (!check_usage_backwards(curr, this, excl_bit, name))
- return 0;
-#endif
- if (verbose(hlock_class(this)))
- return 2;
-
- return 1;
-}
-
static int mark_lock_irq(struct task_struct *curr, struct held_lock *this,
enum lock_usage_bit new_bit)
{
@@ -2186,18 +2173,16 @@
case LOCK_USED_IN_HARDIRQ_READ:
case LOCK_USED_IN_SOFTIRQ_READ:
case LOCK_USED_IN_RECLAIM_FS_READ:
- return mark_lock_irq_used_in_read(curr, this, new_bit);
+ case LOCK_ENABLED_HARDIRQ_READ:
+ case LOCK_ENABLED_SOFTIRQ_READ:
+ case LOCK_ENABLED_RECLAIM_FS_READ:
+ return mark_lock_irq_read(curr, this, new_bit);
case LOCK_ENABLED_HARDIRQ:
case LOCK_ENABLED_SOFTIRQ:
case LOCK_ENABLED_RECLAIM_FS:
return mark_lock_irq_enabled(curr, this, new_bit);
- case LOCK_ENABLED_HARDIRQ_READ:
- case LOCK_ENABLED_SOFTIRQ_READ:
- case LOCK_ENABLED_RECLAIM_FS_READ:
- return mark_lock_irq_enabled_read(curr, this, new_bit);
-
default:
WARN_ON(1);
break;