linux-kernel - [tip:smp/hotplug] smpboot: Place the _

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Date:   Wed, 24 Apr 2019 03:22:06 -0700
From:   tip-bot for Sebastian Andrzej Siewior <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     paulmck@...ux.ibm.com, peterz@...radead.org, mingo@...nel.org,
        torvalds@...ux-foundation.org, lkp@...el.com,
        linux-kernel@...r.kernel.org, hpa@...or.com, bigeasy@...utronix.de,
        tglx@...utronix.de
Subject: [tip:smp/hotplug] smpboot: Place the __percpu annotation correctly

Commit-ID:  d4645d30b50d1691c26ff0f8fa4e718b08f8d3bb
Gitweb:     https://git.kernel.org/tip/d4645d30b50d1691c26ff0f8fa4e718b08f8d3bb
Author:     Sebastian Andrzej Siewior <bigeasy@...utronix.de>
AuthorDate: Wed, 24 Apr 2019 10:52:53 +0200
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Wed, 24 Apr 2019 12:17:08 +0200

smpboot: Place the __percpu annotation correctly

The test robot reported a wrong assignment of a per-CPU variable which
it detected by using sparse and sent a report. The assignment itself is
correct. The annotation for sparse was wrong and hence the report.
The first pointer is a "normal" pointer and points to the per-CPU memory
area. That means that the __percpu annotation has to be moved.

Move the __percpu annotation to pointer which points to the per-CPU
area. This change affects only the sparse tool (and is ignored by the
compiler).

Reported-by: kbuild test robot <lkp@...el.com>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Paul E. McKenney <paulmck@...ux.ibm.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Fixes: f97f8f06a49fe ("smpboot: Provide infrastructure for percpu hotplug threads")
Link: http://lkml.kernel.org/r/20190424085253.12178-1-bigeasy@linutronix.de
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 include/linux/smpboot.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/smpboot.h b/include/linux/smpboot.h
index d0884b525001..9d1bc65d226c 100644
--- a/include/linux/smpboot.h
+++ b/include/linux/smpboot.h
@@ -29,7 +29,7 @@ struct smpboot_thread_data;
  * @thread_comm:	The base name of the thread
  */
 struct smp_hotplug_thread {
-	struct task_struct __percpu	**store;
+	struct task_struct		* __percpu *store;
 	struct list_head		list;
 	int				(*thread_should_run)(unsigned int cpu);
 	void				(*thread_fn)(unsigned int cpu);