[android-common:android15-6.6 7/8] drivers/iommu/io-pgtable-arm-common.c:471:8: warning: no previous prototype for '__arm_lpae_unmap_pages'

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

tree:   https://android.googlesource.com/kernel/common android15-6.6
head:   a7294be0eb7058de592c1713af10741e17c4158f
commit: 528a0fb681c600db04e9700fac40c21cc208773e [7/8] ANDROID: iommu/io-pgtable: Add unmap_pages_walk() operation
config: arm64-defconfig (https://download.01.org/0day-ci/archive/20240305/202403051202.tyUcCLpm-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/20240305/202403051202.tyUcCLpm-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/202403051202.tyUcCLpm-lkp@intel.com/

All warnings (new ones prefixed by >>):

   drivers/iommu/io-pgtable-arm-common.c:143:5: warning: no previous prototype for '__arm_lpae_map' [-Wmissing-prototypes]
     143 | int __arm_lpae_map(struct arm_lpae_io_pgtable *data, unsigned long iova,
         |     ^~~~~~~~~~~~~~
   drivers/iommu/io-pgtable-arm-common.c:264:5: warning: no previous prototype for 'arm_lpae_map_pages' [-Wmissing-prototypes]
     264 | int arm_lpae_map_pages(struct io_pgtable_ops *ops, unsigned long iova,
         |     ^~~~~~~~~~~~~~~~~~
>> drivers/iommu/io-pgtable-arm-common.c:471:8: warning: no previous prototype for '__arm_lpae_unmap_pages' [-Wmissing-prototypes]
     471 | size_t __arm_lpae_unmap_pages(struct io_pgtable_ops *ops, unsigned long iova,
         |        ^~~~~~~~~~~~~~~~~~~~~~
   drivers/iommu/io-pgtable-arm-common.c:493:13: warning: no previous prototype for 'arm_lpae_iova_to_phys' [-Wmissing-prototypes]
     493 | phys_addr_t arm_lpae_iova_to_phys(struct io_pgtable_ops *ops,
         |             ^~~~~~~~~~~~~~~~~~~~~
   drivers/iommu/io-pgtable-arm-common.c:529:8: warning: no previous prototype for 'arm_lpae_unmap_pages' [-Wmissing-prototypes]
     529 | size_t arm_lpae_unmap_pages(struct io_pgtable_ops *ops, unsigned long iova,
         |        ^~~~~~~~~~~~~~~~~~~~
>> drivers/iommu/io-pgtable-arm-common.c:536:8: warning: no previous prototype for 'arm_lpae_unmap_pages_walk' [-Wmissing-prototypes]
     536 | size_t arm_lpae_unmap_pages_walk(struct io_pgtable_ops *ops, unsigned long iova,
         |        ^~~~~~~~~~~~~~~~~~~~~~~~~


vim +/__arm_lpae_unmap_pages +471 drivers/iommu/io-pgtable-arm-common.c

   469	
   470	
 > 471	size_t __arm_lpae_unmap_pages(struct io_pgtable_ops *ops, unsigned long iova,
   472				      size_t pgsize, size_t pgcount,
   473				      struct iommu_iotlb_gather *gather,
   474				      struct io_pgtable_walker *walker)
   475	{
   476		struct arm_lpae_io_pgtable *data = io_pgtable_ops_to_data(ops);
   477		struct io_pgtable_cfg *cfg = &data->iop.cfg;
   478		arm_lpae_iopte *ptep = data->pgd;
   479		long iaext = (s64)iova >> cfg->ias;
   480	
   481		if (WARN_ON(!pgsize || (pgsize & cfg->pgsize_bitmap) != pgsize || !pgcount))
   482			return 0;
   483	
   484		if (cfg->quirks & IO_PGTABLE_QUIRK_ARM_TTBR1)
   485			iaext = ~iaext;
   486		if (WARN_ON(iaext))
   487			return 0;
   488	
   489		return __arm_lpae_unmap(data, gather, iova, pgsize, pgcount,
   490					data->start_level, ptep, walker);
   491	}
   492	
   493	phys_addr_t arm_lpae_iova_to_phys(struct io_pgtable_ops *ops,
   494					  unsigned long iova)
   495	{
   496		struct arm_lpae_io_pgtable *data = io_pgtable_ops_to_data(ops);
   497		arm_lpae_iopte pte, *ptep = data->pgd;
   498		int lvl = data->start_level;
   499	
   500		do {
   501			/* Valid IOPTE pointer? */
   502			if (!ptep)
   503				return 0;
   504	
   505			/* Grab the IOPTE we're interested in */
   506			ptep += ARM_LPAE_LVL_IDX(iova, lvl, data);
   507			pte = READ_ONCE(*ptep);
   508	
   509			/* Valid entry? */
   510			if (!pte)
   511				return 0;
   512	
   513			/* Leaf entry? */
   514			if (iopte_leaf(pte, lvl, data->iop.fmt))
   515				goto found_translation;
   516	
   517			/* Take it to the next level */
   518			ptep = iopte_deref(pte, data);
   519		} while (++lvl < ARM_LPAE_MAX_LEVELS);
   520	
   521		/* Ran out of page tables to walk */
   522		return 0;
   523	
   524	found_translation:
   525		iova &= (ARM_LPAE_BLOCK_SIZE(lvl, data) - 1);
   526		return iopte_to_paddr(pte, data) | iova;
   527	}
   528	
   529	size_t arm_lpae_unmap_pages(struct io_pgtable_ops *ops, unsigned long iova,
   530				    size_t pgsize, size_t pgcount,
   531				    struct iommu_iotlb_gather *gather)
   532	{
   533		return __arm_lpae_unmap_pages(ops, iova, pgsize, pgcount, gather, NULL);
   534	}
   535	
 > 536	size_t arm_lpae_unmap_pages_walk(struct io_pgtable_ops *ops, unsigned long iova,
   537					 size_t pgsize, size_t pgcount,
   538					 struct iommu_iotlb_gather *gather,
   539					 struct io_pgtable_walker *walker)
   540	{
   541		return __arm_lpae_unmap_pages(ops, iova, pgsize, pgcount, gather, walker);
   542	}
   543	

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