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authorPeter Zijlstra <a.p.zijlstra@chello.nl>2009-01-22 16:51:29 +0100
committerIngo Molnar <mingo@elte.hu>2009-02-14 23:28:12 +0100
commit780e820b2dfefdfead9243724c2d2b73f379fda6 (patch)
tree7eb55c3e4535d8404ddaf28a279637c922382952 /kernel/lockdep.c
parentcd95302d255264c5e6ebe1063320d80517bf2f83 (diff)
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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>
Diffstat (limited to 'kernel/lockdep.c')
-rw-r--r--kernel/lockdep.c61
1 files changed, 23 insertions, 38 deletions
diff --git a/kernel/lockdep.c b/kernel/lockdep.c
index e0a027d58dab..2d95f9db2598 100644
--- a/kernel/lockdep.c
+++ b/kernel/lockdep.c
@@ -2091,22 +2091,34 @@ mark_lock_irq_used_in(struct task_struct *curr, struct held_lock *this,
}
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 @@ mark_lock_irq_enabled(struct task_struct *curr, struct held_lock *this,
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 @@ static int mark_lock_irq(struct task_struct *curr, struct held_lock *this,
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;