linux-kernel - [peterz-queue:sched/idle 5/33] drivers/idle/intel_idle.c:134: warning: expecting prototype for intel_idle(). Prototype was for __intel

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Message-ID: <202206060056.fqu4UFgZ-lkp@intel.com>
Date:   Mon, 6 Jun 2022 01:01:20 +0800
From:   kernel test robot <lkp@...el.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org
Subject: [peterz-queue:sched/idle 5/33] drivers/idle/intel_idle.c:134:
 warning: expecting prototype for intel_idle(). Prototype was for
 __intel_idle() instead

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git sched/idle
head:   5aca393851ce7ebb9a3405bb4ffd4f38d96949e4
commit: 625fb75b0c1feec90c70e69c722cb6df86ff3631 [5/33] cpuidle,intel_idle: Fix CPUIDLE_FLAG_IRQ_ENABLE
config: i386-debian-10.3-kselftests (https://download.01.org/0day-ci/archive/20220606/202206060056.fqu4UFgZ-lkp@intel.com/config)
compiler: gcc-11 (Debian 11.3.0-1) 11.3.0
reproduce (this is a W=1 build):
        # https://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git/commit/?id=625fb75b0c1feec90c70e69c722cb6df86ff3631
        git remote add peterz-queue https://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git
        git fetch --no-tags peterz-queue sched/idle
        git checkout 625fb75b0c1feec90c70e69c722cb6df86ff3631
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 O=build_dir ARCH=i386 SHELL=/bin/bash drivers/idle/

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@...el.com>

All warnings (new ones prefixed by >>):

>> drivers/idle/intel_idle.c:134: warning: expecting prototype for intel_idle(). Prototype was for __intel_idle() instead


vim +134 drivers/idle/intel_idle.c

b1beab48f6148d Len Brown         2013-01-31  117  
30a996fbb359ed Rafael J. Wysocki 2020-02-06  118  /**
30a996fbb359ed Rafael J. Wysocki 2020-02-06  119   * intel_idle - Ask the processor to enter the given idle state.
30a996fbb359ed Rafael J. Wysocki 2020-02-06  120   * @dev: cpuidle device of the target CPU.
30a996fbb359ed Rafael J. Wysocki 2020-02-06  121   * @drv: cpuidle driver (assumed to point to intel_idle_driver).
30a996fbb359ed Rafael J. Wysocki 2020-02-06  122   * @index: Target idle state index.
30a996fbb359ed Rafael J. Wysocki 2020-02-06  123   *
30a996fbb359ed Rafael J. Wysocki 2020-02-06  124   * Use the MWAIT instruction to notify the processor that the CPU represented by
30a996fbb359ed Rafael J. Wysocki 2020-02-06  125   * @dev is idle and it can try to enter the idle state corresponding to @index.
30a996fbb359ed Rafael J. Wysocki 2020-02-06  126   *
30a996fbb359ed Rafael J. Wysocki 2020-02-06  127   * If the local APIC timer is not known to be reliable in the target idle state,
30a996fbb359ed Rafael J. Wysocki 2020-02-06  128   * enable one-shot tick broadcasting for the target CPU before executing MWAIT.
30a996fbb359ed Rafael J. Wysocki 2020-02-06  129   *
30a996fbb359ed Rafael J. Wysocki 2020-02-06  130   * Must be called under local_irq_disable().
30a996fbb359ed Rafael J. Wysocki 2020-02-06  131   */
625fb75b0c1fee Peter Zijlstra    2022-06-02  132  static __always_inline int __intel_idle(struct cpuidle_device *dev,
30a996fbb359ed Rafael J. Wysocki 2020-02-06  133  					struct cpuidle_driver *drv, int index)
30a996fbb359ed Rafael J. Wysocki 2020-02-06 @134  {
30a996fbb359ed Rafael J. Wysocki 2020-02-06  135  	struct cpuidle_state *state = &drv->states[index];
30a996fbb359ed Rafael J. Wysocki 2020-02-06  136  	unsigned long eax = flg2MWAIT(state->flags);
30a996fbb359ed Rafael J. Wysocki 2020-02-06  137  	unsigned long ecx = 1; /* break on interrupt flag */
30a996fbb359ed Rafael J. Wysocki 2020-02-06  138  
30a996fbb359ed Rafael J. Wysocki 2020-02-06  139  	mwait_idle_with_hints(eax, ecx);
30a996fbb359ed Rafael J. Wysocki 2020-02-06  140  
30a996fbb359ed Rafael J. Wysocki 2020-02-06  141  	return index;
30a996fbb359ed Rafael J. Wysocki 2020-02-06  142  }
30a996fbb359ed Rafael J. Wysocki 2020-02-06  143  

:::::: The code at line 134 was first introduced by commit
:::::: 30a996fbb359ed53536a055af84a54223beabf91 intel_idle: Relocate definitions of cpuidle callbacks

:::::: TO: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
:::::: CC: Rafael J. Wysocki <rafael.j.wysocki@...el.com>

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