linux-kernel - Re: [4.1.3-rt10][RFC PATCH] PM / sleep: freeze: fix bug "sleeping function called from invalid context"

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Date:	Wed, 21 Oct 2015 06:35:56 +0800
From:	kbuild test robot <lkp@...el.com>
To:	Grygorii Strashko <grygorii.strashko@...com>
Cc:	kbuild-all@...org, tglx@...utronix.de,
	"Rafael J. Wysocki" <rjw@...ysocki.net>, bigeasy@...utronix.de,
	linux-rt-users@...r.kernel.org, Sekhar Nori <nsekhar@...com>,
	linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
	Grygorii Strashko <grygorii.strashko@...com>
Subject: Re: [4.1.3-rt10][RFC PATCH] PM / sleep: freeze: fix bug "sleeping
 function called from invalid context"

Hi Grygorii,

[auto build test ERROR on v4.3-rc6 -- if it's inappropriate base, please suggest rules for selecting the more suitable base]

url:    https://github.com/0day-ci/linux/commits/Grygorii-Strashko/PM-sleep-freeze-fix-bug-sleeping-function-called-from-invalid-context/20151021-043733
config: avr32-atngw100_defconfig (attached as .config)
reproduce:
        wget https://git.kernel.org/cgit/linux/kernel/git/wfg/lkp-tests.git/plain/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        make.cross ARCH=avr32 

All error/warnings (new ones prefixed by >>):

>> kernel/power/suspend.c:32:31: error: linux/wait-simple.h: No such file or directory
>> kernel/power/suspend.c:41: warning: type defaults to 'int' in declaration of 'DEFINE_SWAIT_HEAD'
>> kernel/power/suspend.c:41: warning: parameter names (without types) in function declaration
   kernel/power/suspend.c: In function 'freeze_enter':
>> kernel/power/suspend.c:74: error: implicit declaration of function 'swait_event'
>> kernel/power/suspend.c:74: error: 'suspend_freeze_wait_head' undeclared (first use in this function)
   kernel/power/suspend.c:74: error: (Each undeclared identifier is reported only once
   kernel/power/suspend.c:74: error: for each function it appears in.)
   kernel/power/suspend.c: In function 'freeze_wake':
>> kernel/power/suspend.c:95: error: implicit declaration of function 'swait_wake'
   kernel/power/suspend.c:95: error: 'suspend_freeze_wait_head' undeclared (first use in this function)

vim +32 kernel/power/suspend.c

    26	#include <linux/suspend.h>
    27	#include <linux/syscore_ops.h>
    28	#include <linux/ftrace.h>
    29	#include <trace/events/power.h>
    30	#include <linux/compiler.h>
    31	#include <linux/moduleparam.h>
  > 32	#include <linux/wait-simple.h>
    33	
    34	#include "power.h"
    35	
    36	const char *pm_labels[] = { "mem", "standby", "freeze", NULL };
    37	const char *pm_states[PM_SUSPEND_MAX];
    38	
    39	static const struct platform_suspend_ops *suspend_ops;
    40	static const struct platform_freeze_ops *freeze_ops;
  > 41	static DEFINE_SWAIT_HEAD(suspend_freeze_wait_head);
    42	
    43	enum freeze_state __read_mostly suspend_freeze_state;
    44	static DEFINE_RAW_SPINLOCK(suspend_freeze_lock);
    45	
    46	void freeze_set_ops(const struct platform_freeze_ops *ops)
    47	{
    48		lock_system_sleep();
    49		freeze_ops = ops;
    50		unlock_system_sleep();
    51	}
    52	
    53	static void freeze_begin(void)
    54	{
    55		suspend_freeze_state = FREEZE_STATE_NONE;
    56	}
    57	
    58	static void freeze_enter(void)
    59	{
    60		if (pm_wakeup_pending())
    61			goto out;
    62	
    63		raw_spin_lock_irq(&suspend_freeze_lock);
    64		suspend_freeze_state = FREEZE_STATE_ENTER;
    65		raw_spin_unlock_irq(&suspend_freeze_lock);
    66	
    67		get_online_cpus();
    68		cpuidle_resume();
    69	
    70		/* Push all the CPUs into the idle loop. */
    71		wake_up_all_idle_cpus();
    72		pr_debug("PM: suspend-to-idle\n");
    73		/* Make the current CPU wait so it can enter the idle loop too. */
  > 74		swait_event(suspend_freeze_wait_head,
    75			    suspend_freeze_state == FREEZE_STATE_WAKE);
    76		pr_debug("PM: resume from suspend-to-idle\n");
    77	
    78		cpuidle_pause();
    79		put_online_cpus();
    80	
    81		raw_spin_lock_irq(&suspend_freeze_lock);
    82	
    83	 out:
    84		suspend_freeze_state = FREEZE_STATE_NONE;
    85		raw_spin_unlock_irq(&suspend_freeze_lock);
    86	}
    87	
    88	void freeze_wake(void)
    89	{
    90		unsigned long flags;
    91	
    92		raw_spin_lock_irqsave(&suspend_freeze_lock, flags);
    93		if (suspend_freeze_state > FREEZE_STATE_NONE) {
    94			suspend_freeze_state = FREEZE_STATE_WAKE;
  > 95			swait_wake(&suspend_freeze_wait_head);
    96		}
    97		raw_spin_unlock_irqrestore(&suspend_freeze_lock, flags);
    98	}

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation

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