Merge tag 'core-debugobjects-2023-05-06' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull debugobjects fix from Thomas Gleixner:
"A single fix for debugobjects:
The recent fix to ensure atomicity of lookup and allocation
inadvertently broke the pool refill mechanism, so that debugobject
OOMs now in certain situations. The reason is that the functions which
got updated no longer invoke debug_objecs_init(), which is now the
only place to care about refilling the tracking object pool.
Restore the original behaviour by adding explicit refill opportunities
to those places"
* tag 'core-debugobjects-2023-05-06' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
debugobject: Ensure pool refill (again)
diff --git a/lib/debugobjects.c b/lib/debugobjects.c
index b796799..003edc5 100644
--- a/lib/debugobjects.c
+++ b/lib/debugobjects.c
@@ -587,6 +587,16 @@
return NULL;
}
+static void debug_objects_fill_pool(void)
+{
+ /*
+ * On RT enabled kernels the pool refill must happen in preemptible
+ * context:
+ */
+ if (!IS_ENABLED(CONFIG_PREEMPT_RT) || preemptible())
+ fill_pool();
+}
+
static void
__debug_object_init(void *addr, const struct debug_obj_descr *descr, int onstack)
{
@@ -595,12 +605,7 @@
struct debug_obj *obj;
unsigned long flags;
- /*
- * On RT enabled kernels the pool refill must happen in preemptible
- * context:
- */
- if (!IS_ENABLED(CONFIG_PREEMPT_RT) || preemptible())
- fill_pool();
+ debug_objects_fill_pool();
db = get_bucket((unsigned long) addr);
@@ -685,6 +690,8 @@
if (!debug_objects_enabled)
return 0;
+ debug_objects_fill_pool();
+
db = get_bucket((unsigned long) addr);
raw_spin_lock_irqsave(&db->lock, flags);
@@ -894,6 +901,8 @@
if (!debug_objects_enabled)
return;
+ debug_objects_fill_pool();
+
db = get_bucket((unsigned long) addr);
raw_spin_lock_irqsave(&db->lock, flags);
