linux-kernel - include/linux/hrtimer.h:348:9: sparse: sparse: dereference of noderef expression

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Message-ID: <202504072155.5UAZjYGU-lkp@intel.com>
Date: Mon, 7 Apr 2025 21:15:56 +0800
From: kernel test robot <lkp@...el.com>
To: Nam Cao <namcao@...utronix.de>
Cc: oe-kbuild-all@...ts.linux.dev, linux-kernel@...r.kernel.org,
	Ingo Molnar <mingo@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: include/linux/hrtimer.h:348:9: sparse: sparse: dereference of
 noderef expression

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   0af2f6be1b4281385b618cb86ad946eded089ac8
commit: 04257da0c99c9d4ff7c5bb93046482e1f7d34938 hrtimers: Make callback function pointer private
date:   2 days ago
config: powerpc-randconfig-r112-20250407 (https://download.01.org/0day-ci/archive/20250407/202504072155.5UAZjYGU-lkp@intel.com/config)
compiler: clang version 18.1.8 (https://github.com/llvm/llvm-project 3b5b5c1ec4a3095ab096dd780e84d7ab81f3d7ff)
reproduce: (https://download.01.org/0day-ci/archive/20250407/202504072155.5UAZjYGU-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@...el.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202504072155.5UAZjYGU-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
   drivers/tty/serial/xilinx_uartps.c: note: in included file (through include/linux/pm.h, include/linux/device.h, include/linux/platform_device.h):
>> include/linux/hrtimer.h:348:9: sparse: sparse: dereference of noderef expression
>> include/linux/hrtimer.h:348:9: sparse: sparse: dereference of noderef expression

vim +348 include/linux/hrtimer.h

4346f65426cbce Oliver Hartkopp 2008-04-30  327  
8f02e3563bb582 Nam Cao         2024-10-31  328  /**
8f02e3563bb582 Nam Cao         2024-10-31  329   * hrtimer_update_function - Update the timer's callback function
8f02e3563bb582 Nam Cao         2024-10-31  330   * @timer:	Timer to update
8f02e3563bb582 Nam Cao         2024-10-31  331   * @function:	New callback function
8f02e3563bb582 Nam Cao         2024-10-31  332   *
8f02e3563bb582 Nam Cao         2024-10-31  333   * Only safe to call if the timer is not enqueued. Can be called in the callback function if the
8f02e3563bb582 Nam Cao         2024-10-31  334   * timer is not enqueued at the same time (see the comments above HRTIMER_STATE_ENQUEUED).
8f02e3563bb582 Nam Cao         2024-10-31  335   */
8f02e3563bb582 Nam Cao         2024-10-31  336  static inline void hrtimer_update_function(struct hrtimer *timer,
8f02e3563bb582 Nam Cao         2024-10-31  337  					   enum hrtimer_restart (*function)(struct hrtimer *))
8f02e3563bb582 Nam Cao         2024-10-31  338  {
2ea97b76d6712b Thomas Gleixner 2025-02-07  339  #ifdef CONFIG_PROVE_LOCKING
8f02e3563bb582 Nam Cao         2024-10-31  340  	guard(raw_spinlock_irqsave)(&timer->base->cpu_base->lock);
8f02e3563bb582 Nam Cao         2024-10-31  341  
8f02e3563bb582 Nam Cao         2024-10-31  342  	if (WARN_ON_ONCE(hrtimer_is_queued(timer)))
8f02e3563bb582 Nam Cao         2024-10-31  343  		return;
8f02e3563bb582 Nam Cao         2024-10-31  344  
8f02e3563bb582 Nam Cao         2024-10-31  345  	if (WARN_ON_ONCE(!function))
8f02e3563bb582 Nam Cao         2024-10-31  346  		return;
2ea97b76d6712b Thomas Gleixner 2025-02-07  347  #endif
8f02e3563bb582 Nam Cao         2024-10-31 @348  	timer->function = function;
8f02e3563bb582 Nam Cao         2024-10-31  349  }
8f02e3563bb582 Nam Cao         2024-10-31  350  

:::::: The code at line 348 was first introduced by commit
:::::: 8f02e3563bb5824eb01c94f2c75f1dcee2d05625 hrtimers: Introduce hrtimer_update_function()

:::::: TO: Nam Cao <namcao@...utronix.de>
:::::: CC: Thomas Gleixner <tglx@...utronix.de>

-- 
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https://github.com/intel/lkp-tests/wiki