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Date:   Tue, 15 Aug 2023 19:19:38 -0700
From:   "Paul E. McKenney" <paulmck@kernel.org>
To:     kernel test robot <lkp@intel.com>
Cc:     oe-kbuild-all@lists.linux.dev, linux-kernel@vger.kernel.org
Subject: Re: [paulmck-rcu:dev.2023.08.14a 49/51]
 kernel/rcu/rcutorture.c:24:10: fatal error: linux/rcu_notifier.h: No such
 file or directory
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References: <202308160930.YEekR3Wf-lkp@intel.com>
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On Wed, Aug 16, 2023 at 09:55:30AM +0800, kernel test robot wrote:
> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git dev.2023.08.14a
> head:   a90c4cbc91475bd5df35f712a954972fbfff40a1
> commit: 37730a9ba11627b63d8108dd8b3061ea2ee04df9 [49/51] rcutorture: Add test of RCU CPU stall notifiers
> config: sh-allmodconfig (https://download.01.org/0day-ci/archive/20230816/202308160930.YEekR3Wf-lkp@intel.com/config)
> compiler: sh4-linux-gcc (GCC) 12.3.0
> reproduce: (https://download.01.org/0day-ci/archive/20230816/202308160930.YEekR3Wf-lkp@intel.com/reproduce)
> 
> If you fix the issue in a separate patch/commit (i.e. not just a new version of
> the same patch/commit), kindly add following tags
> | Reported-by: kernel test robot <lkp@intel.com>
> | Closes: https://lore.kernel.org/oe-kbuild-all/202308160930.YEekR3Wf-lkp@intel.com/
> 
> All errors (new ones prefixed by >>):
> 
> >> kernel/rcu/rcutorture.c:24:10: fatal error: linux/rcu_notifier.h: No such file or directory
>       24 | #include <linux/rcu_notifier.h>
>          |          ^~~~~~~~~~~~~~~~~~~~~~
>    compilation terminated.

You would think that I would remember "git add".  ;-)

Does the patch below fix things up?

							Thanx, Paul

------------------------------------------------------------------------

commit 2b7e462695eee212f81f7000af4f4af2523ece35
Author: Paul E. McKenney <paulmck@kernel.org>
Date:   Tue Aug 15 19:17:50 2023 -0700

    fixup! rcu: Add RCU CPU stall notifier
    
    Signed-off-by: Paul E. McKenney <paulmck@kernel.org>

diff --git a/include/linux/rcu_notifier.h b/include/linux/rcu_notifier.h
new file mode 100644
index 000000000000..ebf371364581
--- /dev/null
+++ b/include/linux/rcu_notifier.h
@@ -0,0 +1,32 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Read-Copy Update notifiers, initially RCU CPU stall notifier.
+ * Separate from rcupdate.h to avoid #include loops.
+ *
+ * Copyright (C) 2023 Paul E. McKenney.
+ */
+
+#ifndef __LINUX_RCU_NOTIFIER_H
+#define __LINUX_RCU_NOTIFIER_H
+
+// Actions for RCU CPU stall notifier calls.
+#define RCU_STALL_NOTIFY_NORM	1
+#define RCU_STALL_NOTIFY_EXP	2
+
+#ifdef CONFIG_RCU_STALL_COMMON
+
+#include <linux/notifier.h>
+#include <linux/types.h>
+
+int rcu_stall_chain_notifier_register(struct notifier_block *n);
+int rcu_stall_chain_notifier_unregister(struct notifier_block *n);
+
+#else // #ifdef CONFIG_RCU_STALL_COMMON
+
+// No RCU CPU stall warnings in Tiny RCU.
+static inline int rcu_stall_chain_notifier_register(struct notifier_block *n) { return -EEXIST; }
+static inline int rcu_stall_chain_notifier_unregister(struct notifier_block *n) { return -ENOENT; }
+
+#endif // #else // #ifdef CONFIG_RCU_STALL_COMMON
+
+#endif /* __LINUX_RCU_NOTIFIER_H */