Re: [PATCH v2] genirq: procfs: Make smp_affinity read-only for interrupts that userspace can't set

[kernel test robot]

Hi Jeff,

kernel test robot noticed the following build warnings:

[auto build test WARNING on tip/irq/core]
[also build test WARNING on linus/master v6.11-rc5 next-20240826]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Jeff-Xie/genirq-procfs-Make-smp_affinity-read-only-for-interrupts-that-userspace-can-t-set/20240826-153926
base:   tip/irq/core
patch link:    https://lore.kernel.org/r/20240825131911.107119-1-jeff.xie%40linux.dev
patch subject: [PATCH v2] genirq: procfs: Make smp_affinity read-only for interrupts that userspace can't set
config: openrisc-allnoconfig (https://download.01.org/0day-ci/archive/20240827/202408271311.szIyk0et-lkp@xxxxxxxxx/config)
compiler: or1k-linux-gcc (GCC) 14.1.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240827/202408271311.szIyk0et-lkp@xxxxxxxxx/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@xxxxxxxxx>
| Closes: https://lore.kernel.org/oe-kbuild-all/202408271311.szIyk0et-lkp@xxxxxxxxx/

All warnings (new ones prefixed by >>):

   kernel/irq/proc.c: In function 'register_irq_proc':
>> kernel/irq/proc.c:343:17: warning: unused variable 'umode' [-Wunused-variable]
     343 |         umode_t umode = S_IRUGO;
         |                 ^~~~~


vim +/umode +343 kernel/irq/proc.c

   337	
   338	void register_irq_proc(unsigned int irq, struct irq_desc *desc)
   339	{
   340		static DEFINE_MUTEX(register_lock);
   341		void __maybe_unused *irqp = (void *)(unsigned long) irq;
   342		char name [MAX_NAMELEN];
 > 343		umode_t umode = S_IRUGO;
   344	
   345		if (!root_irq_dir || (desc->irq_data.chip == &no_irq_chip))
   346			return;
   347	
   348		/*
   349		 * irq directories are registered only when a handler is
   350		 * added, not when the descriptor is created, so multiple
   351		 * tasks might try to register at the same time.
   352		 */
   353		mutex_lock(&register_lock);
   354	
   355		if (desc->dir)
   356			goto out_unlock;
   357	
   358		sprintf(name, "%d", irq);
   359	
   360		/* create /proc/irq/1234 */
   361		desc->dir = proc_mkdir(name, root_irq_dir);
   362		if (!desc->dir)
   363			goto out_unlock;
   364	

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