[dhowells-fs:netfs-next 11/28] fs/netfs/bvecq.c:77:20: error: assignment to 'struct bvecq *' from 'int' makes pointer from integer without a cast

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

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs.git netfs-next
head:   3ae015ad2054541c8e406c9dc3e838849bacbabc
commit: 46ffbdd7331ff70da4b75f9275ce7115db637cf0 [11/28] netfs: Make mempool available for bvecq
config: parisc-defconfig (https://download.01.org/0day-ci/archive/20260824/202608241902.wjOA7zyh-lkp@intel.com/config)
compiler: hppa-linux-gcc (GCC) 16.1.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260824/202608241902.wjOA7zyh-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/202608241902.wjOA7zyh-lkp@intel.com/

All errors (new ones prefixed by >>):

   fs/netfs/bvecq.c: In function 'bvecq_alloc_one':
   fs/netfs/bvecq.c:77:22: error: implicit declaration of function 'mempool_alloc'; did you mean 'mm_alloc'? [-Wimplicit-function-declaration]
      77 |                 bq = mempool_alloc(&netfs_bvecq_pool, gfp);
         |                      ^~~~~~~~~~~~~
         |                      mm_alloc
>> fs/netfs/bvecq.c:77:20: error: assignment to 'struct bvecq *' from 'int' makes pointer from integer without a cast [-Wint-conversion]
      77 |                 bq = mempool_alloc(&netfs_bvecq_pool, gfp);
         |                    ^
   fs/netfs/bvecq.c: In function 'bvecq_put':
   fs/netfs/bvecq.c:275:25: error: implicit declaration of function 'mempool_free' [-Wimplicit-function-declaration]
     275 |                         mempool_free(bq, &netfs_bvecq_pool);
         |                         ^~~~~~~~~~~~


vim +77 fs/netfs/bvecq.c

    40	
    41	/**
    42	 * bvecq_alloc_one - Allocate a single bvecq node with unpopulated slots
    43	 * @nr_slots: Number of slots to allocate
    44	 * @gfp: The allocation constraints.
    45	 * @for_writeback: True if allocating for writeback
    46	 *
    47	 * Allocate a single bvecq node and initialise the header.  A number of inline
    48	 * slots are also allocated, rounded up to fit after the header in a power-of-2
    49	 * slab object of up to 512 bytes (up to 29 slots on a 64-bit cpu).  The caller
    50	 * should be aware that the number of slots allocated may be more or less than
    51	 * the number requested.  The slot array is not initialised.
    52	 *
    53	 * Return: The node pointer or NULL on allocation failure.
    54	 */
    55	struct bvecq *bvecq_alloc_one(size_t nr_slots, gfp_t gfp, bool for_writeback)
    56	{
    57		struct bvecq *bq;
    58		const size_t max_size = 512;
    59		const size_t max_slots = (max_size - sizeof(*bq)) / sizeof(bq->__bv[0]);
    60		size_t part = min(nr_slots, max_slots);
    61		size_t size = roundup_pow_of_two(struct_size(bq, __bv, part));
    62		bool from_pool = false;
    63	
    64		gfp &= ~(GFP_ZONEMASK | __GFP_THISNODE);
    65	
    66		if (for_writeback) {
    67			if (size != BVECQ_STD_SIZE) {
    68				gfp_t gfp_temp = gfp;
    69	
    70				gfp_temp |= __GFP_NOMEMALLOC | __GFP_NORETRY | __GFP_NOWARN;
    71				gfp_temp &= ~(__GFP_DIRECT_RECLAIM | __GFP_IO);
    72				bq = kmalloc(size, gfp_temp);
    73				if (bq)
    74					goto success;
    75			}
    76	
  > 77			bq = mempool_alloc(&netfs_bvecq_pool, gfp);
    78			if (!bq)
    79				return bq;
    80			from_pool = true;
    81			size = BVECQ_STD_SIZE;
    82		} else {
    83			bq = kmalloc(size, gfp);
    84			if (!bq)
    85				return bq;
    86		}
    87	
    88	success:
    89		*bq = (struct bvecq) {
    90			.ref		= REFCOUNT_INIT(1),
    91			.bv		= bq->__bv,
    92			.inline_bv	= true,
    93			.max_slots	= (size - sizeof(*bq)) / sizeof(bq->__bv[0]),
    94			.from_pool	= from_pool,
    95		};
    96		netfs_stat(&netfs_n_bvecq);
    97		return bq;
    98	}
    99	EXPORT_SYMBOL(bvecq_alloc_one);
   100	

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