[PATCH AUTOSEL 4.14 051/167] smpboot: Place the __percpu annotation correctly

Sasha Levin
2019-05-22T19:30:04Z

From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>

[ Upstream commit d4645d30b50d1691c26ff0f8fa4e718b08f8d3bb ]

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@intel.com>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Paul E. McKenney <paulmck@linux.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.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@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.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 c174844cf663e..585e777a7f6ef 100644
--- a/include/linux/smpboot.h
+++ b/include/linux/smpboot.h
@@ -31,7 +31,7 @@ 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