linux-kernel - Re: [PATCH] dma-buf: improve dma_buf_show

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Message-ID: <202510220802.svbgdYsJ-lkp@intel.com>
Date: Wed, 22 Oct 2025 08:41:58 +0800
From: kernel test robot <lkp@...el.com>
To: Biancaa Ramesh <biancaa2210329@....edu.in>,
	linux-kernel@...r.kernel.org
Cc: oe-kbuild-all@...ts.linux.dev,
	Biancaa Ramesh <biancaa2210329@....edu.in>
Subject: Re: [PATCH] dma-buf: improve dma_buf_show_fdinfo output

Hi Biancaa,

kernel test robot noticed the following build warnings:

[auto build test WARNING on linus/master]
[also build test WARNING on v6.18-rc2 next-20251021]
[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/Biancaa-Ramesh/dma-buf-improve-dma_buf_show_fdinfo-output/20251021-213541
base:   linus/master
patch link:    https://lore.kernel.org/r/20251021133132.29751-1-biancaa2210329%40ssn.edu.in
patch subject: [PATCH] dma-buf: improve dma_buf_show_fdinfo output
config: x86_64-buildonly-randconfig-002-20251022 (https://download.01.org/0day-ci/archive/20251022/202510220802.svbgdYsJ-lkp@intel.com/config)
compiler: gcc-14 (Debian 14.2.0-19) 14.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251022/202510220802.svbgdYsJ-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/202510220802.svbgdYsJ-lkp@intel.com/

All warnings (new ones prefixed by >>):

   drivers/dma-buf/dma-buf.c: In function 'dma_buf_show_fdinfo':
>> drivers/dma-buf/dma-buf.c:581:30: warning: format '%lu' expects argument of type 'long unsigned int', but argument 3 has type 'unsigned int' [-Wformat=]
     581 |     seq_printf(s, "flags:\t%lu\n", f->f_flags);
         |                            ~~^     ~~~~~~~~~~
         |                              |      |
         |                              |      unsigned int
         |                              long unsigned int
         |                            %u
>> drivers/dma-buf/dma-buf.c:582:30: warning: format '%llu' expects argument of type 'long long unsigned int', but argument 3 has type 'size_t' {aka 'long unsigned int'} [-Wformat=]
     582 |     seq_printf(s, "size:\t%llu\n", dmabuf->size);
         |                           ~~~^     ~~~~~~~~~~~~
         |                              |           |
         |                              |           size_t {aka long unsigned int}
         |                              long long unsigned int
         |                           %lu
   drivers/dma-buf/dma-buf.c:584:62: error: 'struct dma_buf' has no member named 'num_attachments'; did you mean 'attachments'?
     584 |     seq_printf(s, "attachments:\t%d\n", atomic_read(&dmabuf->num_attachments));
         |                                                              ^~~~~~~~~~~~~~~
         |                                                              attachments
   drivers/dma-buf/dma-buf.c:585:57: error: 'struct dma_buf' has no member named 'num_mappings'
     585 |     seq_printf(s, "mappings:\t%d\n", atomic_read(&dmabuf->num_mappings));
         |                                                         ^~


vim +581 drivers/dma-buf/dma-buf.c

   573	
   574	static void dma_buf_show_fdinfo(struct seq_file *s, struct file *f)
   575	{
   576	    struct dma_buf *dmabuf = f->private_data;
   577	
   578	    if (!dmabuf)
   579	        return;
   580	
 > 581	    seq_printf(s, "flags:\t%lu\n", f->f_flags);
 > 582	    seq_printf(s, "size:\t%llu\n", dmabuf->size);
   583	    seq_printf(s, "count:\t%ld\n", file_count(dmabuf->file) - 1);
   584	    seq_printf(s, "attachments:\t%d\n", atomic_read(&dmabuf->num_attachments));
   585	    seq_printf(s, "mappings:\t%d\n", atomic_read(&dmabuf->num_mappings));
   586	    seq_printf(s, "exp_name:\t%s\n", dmabuf->exp_name ? dmabuf->exp_name : "N/A");
   587	
   588	    spin_lock(&dmabuf->name_lock);
   589	    if (dmabuf->name)
   590	        seq_printf(s, "name:\t%s\n", dmabuf->name);
   591	    spin_unlock(&dmabuf->name_lock);
   592	}
   593	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki