Re: [PATCH 1/2 net-next] libceph: Use sruct_size() in ceph_create_snap_context()

[kernel test robot]

Hi Christophe,

kernel test robot noticed the following build errors:

[auto build test ERROR on net-next/main]

url:    https://github.com/intel-lab-lkp/linux/commits/Christophe-JAILLET/libceph-Use-__counted_by-in-struct-ceph_snap_context/20240519-172142
base:   net-next/main
patch link:    https://lore.kernel.org/r/5b7c72bdb52703bbfa5511ed500aed4babde1308.1716109606.git.christophe.jaillet%40wanadoo.fr
patch subject: [PATCH 1/2 net-next] libceph: Use sruct_size() in ceph_create_snap_context()
config: x86_64-rhel-8.3-rust (https://download.01.org/0day-ci/archive/20240519/202405191916.QmDasdJ5-lkp@xxxxxxxxx/config)
compiler: clang version 18.1.5 (https://github.com/llvm/llvm-project 617a15a9eac96088ae5e9134248d8236e34b91b1)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240519/202405191916.QmDasdJ5-lkp@xxxxxxxxx/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@xxxxxxxxx>
| Closes: https://lore.kernel.org/oe-kbuild-all/202405191916.QmDasdJ5-lkp@xxxxxxxxx/

All errors (new ones prefixed by >>):

>> net/ceph/snapshot.c:32:18: error: call to undeclared function 'sruct_size'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
      32 |         snapc = kzalloc(sruct_size(snapc, snaps, snap_count), gfp_flags);
         |                         ^
>> net/ceph/snapshot.c:32:36: error: use of undeclared identifier 'snaps'; did you mean 'snapc'?
      32 |         snapc = kzalloc(sruct_size(snapc, snaps, snap_count), gfp_flags);
         |                                           ^~~~~
         |                                           snapc
   net/ceph/snapshot.c:30:28: note: 'snapc' declared here
      30 |         struct ceph_snap_context *snapc;
         |                                   ^
   2 errors generated.


vim +/sruct_size +32 net/ceph/snapshot.c

    11	
    12	/*
    13	 * Ceph snapshot contexts are reference counted objects, and the
    14	 * returned structure holds a single reference.  Acquire additional
    15	 * references with ceph_get_snap_context(), and release them with
    16	 * ceph_put_snap_context().  When the reference count reaches zero
    17	 * the entire structure is freed.
    18	 */
    19	
    20	/*
    21	 * Create a new ceph snapshot context large enough to hold the
    22	 * indicated number of snapshot ids (which can be 0).  Caller has
    23	 * to fill in snapc->seq and snapc->snaps[0..snap_count-1].
    24	 *
    25	 * Returns a null pointer if an error occurs.
    26	 */
    27	struct ceph_snap_context *ceph_create_snap_context(u32 snap_count,
    28							gfp_t gfp_flags)
    29	{
    30		struct ceph_snap_context *snapc;
    31	
  > 32		snapc = kzalloc(sruct_size(snapc, snaps, snap_count), gfp_flags);
    33		if (!snapc)
    34			return NULL;
    35	
    36		refcount_set(&snapc->nref, 1);
    37		snapc->num_snaps = snap_count;
    38	
    39		return snapc;
    40	}
    41	EXPORT_SYMBOL(ceph_create_snap_context);
    42	

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