[opencloudos:linux-5.4/next 27252/27434] kernel/irq/manage.c:350:5: warning: no previous prototype for 'irq_update_affinity_desc'

[kernel test robot <lkp@intel.com>]

tree:   https://gitee.com/OpenCloudOS/OpenCloudOS-Kernel.git linux-5.4/next
head:   0e88d1c26496999d1b2e37f3393b602d28b03faf
commit: 17568159e8f86e6ce059ca5b8d54fa54042d1bed [27252/27434] genirq: Export affinity setter for modules
config: arm64-allnoconfig (https://download.01.org/0day-ci/archive/20240305/202403050757.ZDfe69e3-lkp@intel.com/config)
compiler: aarch64-linux-gcc (GCC) 13.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240305/202403050757.ZDfe69e3-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@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202403050757.ZDfe69e3-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> kernel/irq/manage.c:350:5: warning: no previous prototype for 'irq_update_affinity_desc' [-Wmissing-prototypes]
     350 | int irq_update_affinity_desc(unsigned int irq,
         |     ^~~~~~~~~~~~~~~~~~~~~~~~


vim +/irq_update_affinity_desc +350 kernel/irq/manage.c

   334	
   335	/**
   336	 * irq_update_affinity_desc - Update affinity management for an interrupt
   337	 * @irq:	The interrupt number to update
   338	 * @affinity:	Pointer to the affinity descriptor
   339	 *
   340	 * This interface can be used to configure the affinity management of
   341	 * interrupts which have been allocated already.
   342	 *
   343	 * There are certain limitations on when it may be used - attempts to use it
   344	 * for when the kernel is configured for generic IRQ reservation mode (in
   345	 * config GENERIC_IRQ_RESERVATION_MODE) will fail, as it may conflict with
   346	 * managed/non-managed interrupt accounting. In addition, attempts to use it on
   347	 * an interrupt which is already started or which has already been configured
   348	 * as managed will also fail, as these mean invalid init state or double init.
   349	 */
 > 350	int irq_update_affinity_desc(unsigned int irq,
   351				     struct irq_affinity_desc *affinity)
   352	{
   353		struct irq_desc *desc;
   354		unsigned long flags;
   355		bool activated;
   356		int ret = 0;
   357	
   358		/*
   359		 * Supporting this with the reservation scheme used by x86 needs
   360		 * some more thought. Fail it for now.
   361		 */
   362		if (IS_ENABLED(CONFIG_GENERIC_IRQ_RESERVATION_MODE))
   363			return -EOPNOTSUPP;
   364	
   365		desc = irq_get_desc_buslock(irq, &flags, 0);
   366		if (!desc)
   367			return -EINVAL;
   368	
   369		/* Requires the interrupt to be shut down */
   370		if (irqd_is_started(&desc->irq_data)) {
   371			ret = -EBUSY;
   372			goto out_unlock;
   373		}
   374	
   375		/* Interrupts which are already managed cannot be modified */
   376		if (irqd_affinity_is_managed(&desc->irq_data)) {
   377			ret = -EBUSY;
   378			goto out_unlock;
   379		}
   380	
   381		/*
   382		 * Deactivate the interrupt. That's required to undo
   383		 * anything an earlier activation has established.
   384		 */
   385		activated = irqd_is_activated(&desc->irq_data);
   386		if (activated)
   387			irq_domain_deactivate_irq(&desc->irq_data);
   388	
   389		if (affinity->is_managed) {
   390			irqd_set(&desc->irq_data, IRQD_AFFINITY_MANAGED);
   391			irqd_set(&desc->irq_data, IRQD_MANAGED_SHUTDOWN);
   392		}
   393	
   394		cpumask_copy(desc->irq_common_data.affinity, &affinity->mask);
   395	
   396		/* Restore the activation state */
   397		if (activated)
   398			irq_domain_activate_irq(&desc->irq_data, false);
   399	
   400	out_unlock:
   401		irq_put_desc_busunlock(desc, flags);
   402		return ret;
   403	}
   404	

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