Re: [PATCH v2] dmabuf: Add the capability to expose DMA-BUF stats in sysfs

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Hi Hridya,

I love your patch! Perhaps something to improve:

[auto build test WARNING on linus/master]
[also build test WARNING on v5.11-rc5]
[cannot apply to next-20210125]
[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]

url:    https://github.com/0day-ci/linux/commits/Hridya-Valsaraju/dmabuf-Add-the-capability-to-expose-DMA-BUF-stats-in-sysfs/20210120-172216
base:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 45dfb8a5659ad286c28fa59008271dbc4e5e3f2d
config: x86_64-allyesconfig (attached as .config)
compiler: gcc-9 (Debian 9.3.0-15) 9.3.0
reproduce (this is a W=1 build):
        # https://github.com/0day-ci/linux/commit/1ce52d5b375d9055a8ca6a7d78f7f1c256680190
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Hridya-Valsaraju/dmabuf-Add-the-capability-to-expose-DMA-BUF-stats-in-sysfs/20210120-172216
        git checkout 1ce52d5b375d9055a8ca6a7d78f7f1c256680190
        # save the attached .config to linux build tree
        make W=1 ARCH=x86_64 

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

All warnings (new ones prefixed by >>):

>> drivers/dma-buf/dma-buf-sysfs-stats.c:144:6: warning: no previous prototype for 'dma_buf_attach_stats_teardown' [-Wmissing-prototypes]
     144 | void dma_buf_attach_stats_teardown(struct dma_buf_attachment *attach)
         |      ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>> drivers/dma-buf/dma-buf-sysfs-stats.c:158:5: warning: no previous prototype for 'dma_buf_attach_stats_setup' [-Wmissing-prototypes]
     158 | int dma_buf_attach_stats_setup(struct dma_buf_attachment *attach,
         |     ^~~~~~~~~~~~~~~~~~~~~~~~~~
>> drivers/dma-buf/dma-buf-sysfs-stats.c:199:6: warning: no previous prototype for 'dma_buf_stats_teardown' [-Wmissing-prototypes]
     199 | void dma_buf_stats_teardown(struct dma_buf *dmabuf)
         |      ^~~~~~~~~~~~~~~~~~~~~~
>> drivers/dma-buf/dma-buf-sysfs-stats.c:214:5: warning: no previous prototype for 'dma_buf_init_sysfs_statistics' [-Wmissing-prototypes]
     214 | int dma_buf_init_sysfs_statistics(void)
         |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>> drivers/dma-buf/dma-buf-sysfs-stats.c:230:6: warning: no previous prototype for 'dma_buf_uninit_sysfs_statistics' [-Wmissing-prototypes]
     230 | void dma_buf_uninit_sysfs_statistics(void)
         |      ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>> drivers/dma-buf/dma-buf-sysfs-stats.c:236:5: warning: no previous prototype for 'dma_buf_stats_setup' [-Wmissing-prototypes]
     236 | int dma_buf_stats_setup(struct dma_buf *dmabuf)
         |     ^~~~~~~~~~~~~~~~~~~


vim +/dma_buf_attach_stats_teardown +144 drivers/dma-buf/dma-buf-sysfs-stats.c

   143	
 > 144	void dma_buf_attach_stats_teardown(struct dma_buf_attachment *attach)
   145	{
   146		struct dma_buf_attach_sysfs_entry *sysfs_entry;
   147	
   148		sysfs_entry = attach->sysfs_entry;
   149		if (!sysfs_entry)
   150			return;
   151	
   152		sysfs_delete_link(&sysfs_entry->kobj, &attach->dev->kobj, "device");
   153	
   154		kobject_del(&sysfs_entry->kobj);
   155		kobject_put(&sysfs_entry->kobj);
   156	}
   157	
 > 158	int dma_buf_attach_stats_setup(struct dma_buf_attachment *attach,
   159				       unsigned int uid)
   160	{
   161		struct dma_buf_attach_sysfs_entry *sysfs_entry;
   162		int ret;
   163		struct dma_buf *dmabuf;
   164	
   165		if (!attach)
   166			return -EINVAL;
   167	
   168		dmabuf = attach->dmabuf;
   169	
   170		sysfs_entry = kzalloc(sizeof(struct dma_buf_attach_sysfs_entry),
   171				      GFP_KERNEL);
   172		if (!sysfs_entry)
   173			return -ENOMEM;
   174	
   175		sysfs_entry->kobj.kset = dmabuf->sysfs_entry->attach_stats_kset;
   176	
   177		attach->sysfs_entry = sysfs_entry;
   178	
   179		ret = kobject_init_and_add(&sysfs_entry->kobj, &dma_buf_attach_ktype,
   180					   NULL, "%u", uid);
   181		if (ret)
   182			goto kobj_err;
   183	
   184		ret = sysfs_create_link(&sysfs_entry->kobj, &attach->dev->kobj,
   185					"device");
   186		if (ret)
   187			goto link_err;
   188	
   189		return 0;
   190	
   191	link_err:
   192		kobject_del(&sysfs_entry->kobj);
   193	kobj_err:
   194		kobject_put(&sysfs_entry->kobj);
   195		attach->sysfs_entry = NULL;
   196	
   197		return ret;
   198	}
 > 199	void dma_buf_stats_teardown(struct dma_buf *dmabuf)
   200	{
   201		struct dma_buf_sysfs_entry *sysfs_entry;
   202	
   203		sysfs_entry = dmabuf->sysfs_entry;
   204		if (!sysfs_entry)
   205			return;
   206	
   207		kset_unregister(sysfs_entry->attach_stats_kset);
   208		kobject_del(&sysfs_entry->kobj);
   209		kobject_put(&sysfs_entry->kobj);
   210	}
   211	
   212	static struct kset *dma_buf_stats_kset;
   213	static struct kset *dma_buf_per_buffer_stats_kset;
 > 214	int dma_buf_init_sysfs_statistics(void)
   215	{
   216		dma_buf_stats_kset = kset_create_and_add("dmabuf", NULL, kernel_kobj);
   217		if (!dma_buf_stats_kset)
   218			return -ENOMEM;
   219	
   220		dma_buf_per_buffer_stats_kset = kset_create_and_add("buffers", NULL,
   221								    &dma_buf_stats_kset->kobj);
   222		if (!dma_buf_per_buffer_stats_kset) {
   223			kset_unregister(dma_buf_stats_kset);
   224			return -ENOMEM;
   225		}
   226	
   227		return 0;
   228	}
   229	
 > 230	void dma_buf_uninit_sysfs_statistics(void)
   231	{
   232		kset_unregister(dma_buf_per_buffer_stats_kset);
   233		kset_unregister(dma_buf_stats_kset);
   234	}
   235	
 > 236	int dma_buf_stats_setup(struct dma_buf *dmabuf)

---
0-DAY CI Kernel Test Service, Intel Corporation
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