tree 12a6f43adfc87f3c5897d8448a15effdffbd13de
parent 0bb80ecc33a8fb5a682236443c1e740d5c917d1d
author Catalin Marinas <catalin.marinas@arm.com> 1694019165 +0100
committer Catalin Marinas <catalin.marinas@arm.com> 1694534350 +0100

rcu: kmemleak: Ignore kmemleak false positives when RCU-freeing objects

Since the actual slab freeing is deferred when calling kvfree_rcu(), so
is the kmemleak_free() callback informing kmemleak of the object
deletion. From the perspective of the kvfree_rcu() caller, the object is
freed and it may remove any references to it. Since kmemleak does not
scan the tree RCU internal data storing the pointer, it will report such
objects as leaks during the grace period.

Tell kmemleak to ignore such objects on the kvfree_call_rcu() path. Note
that the tiny RCU implementation does not have such issue since the
objects can be tracked from the rcu_ctrlblk structure.

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Reported-by: Christoph Paasch <cpaasch@apple.com>