mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-10-30 08:02:30 +00:00
d4645d30b5
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: f97f8f06a4 ("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>
49 lines
1.7 KiB
C
49 lines
1.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
#ifndef _LINUX_SMPBOOT_H
|
|
#define _LINUX_SMPBOOT_H
|
|
|
|
#include <linux/types.h>
|
|
|
|
struct task_struct;
|
|
/* Cookie handed to the thread_fn*/
|
|
struct smpboot_thread_data;
|
|
|
|
/**
|
|
* struct smp_hotplug_thread - CPU hotplug related thread descriptor
|
|
* @store: Pointer to per cpu storage for the task pointers
|
|
* @list: List head for core management
|
|
* @thread_should_run: Check whether the thread should run or not. Called with
|
|
* preemption disabled.
|
|
* @thread_fn: The associated thread function
|
|
* @create: Optional setup function, called when the thread gets
|
|
* created (Not called from the thread context)
|
|
* @setup: Optional setup function, called when the thread gets
|
|
* operational the first time
|
|
* @cleanup: Optional cleanup function, called when the thread
|
|
* should stop (module exit)
|
|
* @park: Optional park function, called when the thread is
|
|
* parked (cpu offline)
|
|
* @unpark: Optional unpark function, called when the thread is
|
|
* unparked (cpu online)
|
|
* @selfparking: Thread is not parked by the park function.
|
|
* @thread_comm: The base name of the thread
|
|
*/
|
|
struct smp_hotplug_thread {
|
|
struct task_struct * __percpu *store;
|
|
struct list_head list;
|
|
int (*thread_should_run)(unsigned int cpu);
|
|
void (*thread_fn)(unsigned int cpu);
|
|
void (*create)(unsigned int cpu);
|
|
void (*setup)(unsigned int cpu);
|
|
void (*cleanup)(unsigned int cpu, bool online);
|
|
void (*park)(unsigned int cpu);
|
|
void (*unpark)(unsigned int cpu);
|
|
bool selfparking;
|
|
const char *thread_comm;
|
|
};
|
|
|
|
int smpboot_register_percpu_thread(struct smp_hotplug_thread *plug_thread);
|
|
|
|
void smpboot_unregister_percpu_thread(struct smp_hotplug_thread *plug_thread);
|
|
|
|
#endif
|