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authorLinus Torvalds <torvalds@linux-foundation.org>2023-05-07 21:04:26 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2023-05-07 21:04:26 +0300
commit17784de648be93b4eef0ef8fe28a16ff04feecc7 (patch)
tree6550a758b50aa0969ba043e448e88609b8806f77
parent6f69c981811c8b019d7882839e31c34ea8330860 (diff)
parent0af462f19e635ad522f28981238334620881badc (diff)
downloadlinux-17784de648be93b4eef0ef8fe28a16ff04feecc7.tar.xz
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)
-rw-r--r--lib/debugobjects.c21
1 files changed, 15 insertions, 6 deletions
diff --git a/lib/debugobjects.c b/lib/debugobjects.c
index b796799fadb2..003edc5ebd67 100644
--- a/lib/debugobjects.c
+++ b/lib/debugobjects.c
@@ -587,6 +587,16 @@ static struct debug_obj *lookup_object_or_alloc(void *addr, struct debug_bucket
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 @@ __debug_object_init(void *addr, const struct debug_obj_descr *descr, int onstack
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 @@ int debug_object_activate(void *addr, const struct debug_obj_descr *descr)
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 @@ void debug_object_assert_init(void *addr, const struct debug_obj_descr *descr)
if (!debug_objects_enabled)
return;
+ debug_objects_fill_pool();
+
db = get_bucket((unsigned long) addr);
raw_spin_lock_irqsave(&db->lock, flags);