linux-kernel - [PATCH] smpboot: Place the _

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Date:   Wed, 24 Apr 2019 10:52:53 +0200
From:   Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:     linux-kernel@...r.kernel.org
Cc:     tglx@...utronix.de, Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...nel.org>,
        "Paul E. McKenney" <paulmck@...ux.ibm.com>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        kbuild test robot <lkp@...el.com>
Subject: [PATCH] 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>
Link: https://lkml.kernel.org/r/201904231828.a3jAyl28%25lkp@intel.com
Fixes: f97f8f06a49fe ("smpboot: Provide infrastructure for percpu hotplug threads")
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
---
 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 d0884b5250010..9d1bc65d226cc 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);
-- 
2.20.1