[ti:ti-linux-5.4.y 3134/12975] drivers/soc/ti/ti-pat.c:406:5: warning: no previous prototype for 'ti_pat_export'

[ti:ti-linux-5.4.y 3134/12975] drivers/soc/ti/ti-pat.c:406:5: warning: no previous prototype for 'ti_pat_export'

[kernel test robot]

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tree:   git://git.ti.com/ti-linux-kernel/ti-linux-kernel.git ti-linux-5.4.y
head:   5aea85e559610bad4007450d95456084edb025fb
commit: 836024ddc4ababf10dad367c2998dd82c68c96a3 [3134/12975] soc: ti: Add Support for the TI Page-based Address Translator (PAT)
config: arm64-allyesconfig (attached as .config)
compiler: aarch64-linux-gcc (GCC) 9.3.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        git remote add ti git://git.ti.com/ti-linux-kernel/ti-linux-kernel.git
        git fetch --no-tags ti ti-linux-5.4.y
        git checkout 836024ddc4ababf10dad367c2998dd82c68c96a3
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=arm64 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

>> drivers/soc/ti/ti-pat.c:406:5: warning: no previous prototype for 'ti_pat_export' [-Wmissing-prototypes]
     406 | int ti_pat_export(struct ti_pat_data *pat,
         |     ^~~~~~~~~~~~~
   drivers/soc/ti/ti-pat.c: In function 'ti_pat_ioctl':
   drivers/soc/ti/ti-pat.c:482:17: warning: comparison of unsigned expression < 0 is always false [-Wtype-limits]
     482 |   if (export.fd < 0) {
         |                 ^


vim +/ti_pat_export +406 drivers/soc/ti/ti-pat.c

   405	
 > 406	int ti_pat_export(struct ti_pat_data *pat,
   407			  struct dma_buf *i_dma_buf,
   408			  struct dma_buf **e_dma_buf)
   409	{
   410		struct ti_pat_buffer *buffer;
   411		DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
   412		int ret;
   413	
   414		buffer = kzalloc(sizeof(*buffer), GFP_KERNEL);
   415		if (!buffer)
   416			return -ENOMEM;
   417	
   418		buffer->pat = pat;
   419		buffer->i_dma_buf = i_dma_buf;
   420		buffer->size = buffer->i_dma_buf->size;
   421		mutex_init(&buffer->lock);
   422		INIT_LIST_HEAD(&buffer->attachments);
   423		buffer->map_count = 0;
   424	
   425		/* Reserve PAT space */
   426		buffer->offset = gen_pool_alloc(buffer->pat->pool, buffer->size);
   427		if (!buffer->offset) {
   428			ret = -ENOMEM;
   429			goto free_buffer;
   430		}
   431	
   432		exp_info.ops = &dma_buf_ops;
   433		exp_info.size = buffer->size;
   434		exp_info.flags = O_RDWR;
   435		exp_info.priv = buffer;
   436	
   437		*e_dma_buf = dma_buf_export(&exp_info);
   438		if (IS_ERR(*e_dma_buf)) {
   439			ret = PTR_ERR(*e_dma_buf);
   440			goto free_pool;
   441		}
   442	
   443		return 0;
   444	
   445	free_pool:
   446		gen_pool_free(buffer->pat->pool, buffer->offset, buffer->size);
   447	free_buffer:
   448		kfree(buffer);
   449		return ret;
   450	}
   451	EXPORT_SYMBOL_GPL(ti_pat_export);
   452	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all(a)lists.01.org

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