+ init-add-lockdep-annotation-to-kthreadd_done-completer.patch added to mm-hotfixes-unstable branch

+ init-add-lockdep-annotation-to-kthreadd_done-completer.patch added to mm-hotfixes-unstable branch

[Andrew Morton]

The patch titled
     Subject: init: add lockdep annotation to kthreadd_done completer
has been added to the -mm mm-hotfixes-unstable branch.  Its filename is
     init-add-lockdep-annotation-to-kthreadd_done-completer.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/init-add-lockdep-annotation-to-kthreadd_done-completer.patch

This patch will later appear in the mm-hotfixes-unstable branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

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------------------------------------------------------
From: Helge Deller <deller@gmx.de>
Subject: init: add lockdep annotation to kthreadd_done completer
Date: Fri, 11 Aug 2023 18:04:22 +0200

Add the missing lockdep annotation to avoid this warning:

 INFO: trying to register non-static key.
 The code is fine but needs lockdep annotation, or maybe
 you didn't initialize this object before use?
 turning off the locking correctness validator.
 CPU: 0 PID: 1 Comm: swapper/0 Not tainted 6.5.0-rc5+ #681
 Hardware name: 9000/785/C3700
 Backtrace:
  [<000000004030bcd0>] show_stack+0x74/0xb0
  [<0000000041469c7c>] dump_stack_lvl+0x104/0x180
  [<0000000041469d2c>] dump_stack+0x34/0x48
  [<000000004040e5b4>] register_lock_class+0xd24/0xd30
  [<000000004040c21c>] __lock_acquire.isra.0+0xb4/0xac8
  [<000000004040cd60>] lock_acquire+0x130/0x298
  [<000000004146df54>] _raw_spin_lock_irq+0x60/0xb8
  [<0000000041472044>] wait_for_completion+0xa0/0x2d0
  [<000000004146b544>] kernel_init+0x48/0x3a8
  [<0000000040302020>] ret_from_kernel_thread+0x20/0x28

Link: https://lkml.kernel.org/r/ZNZcBkiVkm87+Tvr@p100
Signed-off-by: Helge Deller <deller@gmx.de>
Cc: Mike Rapoport (IBM) <rppt@kernel.org>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 init/main.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/init/main.c~init-add-lockdep-annotation-to-kthreadd_done-completer
+++ a/init/main.c
@@ -682,6 +682,8 @@ noinline void __ref __noreturn rest_init
 	struct task_struct *tsk;
 	int pid;
 
+	init_completion(&kthreadd_done);
+
 	rcu_scheduler_starting();
 	/*
 	 * We need to spawn init first so that it obtains pid 1, however
_

Patches currently in -mm which might be from deller@gmx.de are

mm-add-lockdep-annotation-to-pgdat_init_all_done_comp-completer.patch
init-add-lockdep-annotation-to-kthreadd_done-completer.patch