netdev - Re: [PATCH V2] mlx4_core: allocate ICM memory in page size chunks

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Date:   Fri, 18 May 2018 02:39:50 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Qing Huang <qing.huang@...cle.com>
Cc:     kbuild-all@...org, tariqt@...lanox.com, davem@...emloft.net,
        haakon.bugge@...cle.com, yanjun.zhu@...cle.com,
        netdev@...r.kernel.org, linux-rdma@...r.kernel.org,
        linux-kernel@...r.kernel.org, Qing Huang <qing.huang@...cle.com>
Subject: Re: [PATCH V2] mlx4_core: allocate ICM memory in page size chunks

Hi Qing,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on net-next/master]
[also build test ERROR on v4.17-rc5 next-20180517]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Qing-Huang/mlx4_core-allocate-ICM-memory-in-page-size-chunks/20180512-090438
config: sparc64-allyesconfig (attached as .config)
compiler: sparc64-linux-gnu-gcc (Debian 7.2.0-11) 7.2.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        make.cross ARCH=sparc64 

All error/warnings (new ones prefixed by >>):

   drivers/net//ethernet/mellanox/mlx4/icm.c: In function 'mlx4_init_icm_table':
>> drivers/net//ethernet/mellanox/mlx4/icm.c:403:20: error: implicit declaration of function 'vzalloc'; did you mean 'kzalloc'? [-Werror=implicit-function-declaration]
     table->icm      = vzalloc(num_icm * sizeof(*table->icm));
                       ^~~~~~~
                       kzalloc
>> drivers/net//ethernet/mellanox/mlx4/icm.c:403:18: warning: assignment makes pointer from integer without a cast [-Wint-conversion]
     table->icm      = vzalloc(num_icm * sizeof(*table->icm));
                     ^
>> drivers/net//ethernet/mellanox/mlx4/icm.c:449:2: error: implicit declaration of function 'vfree'; did you mean 'kfree'? [-Werror=implicit-function-declaration]
     vfree(table->icm);
     ^~~~~
     kfree
   cc1: some warnings being treated as errors

vim +403 drivers/net//ethernet/mellanox/mlx4/icm.c

   389	
   390	int mlx4_init_icm_table(struct mlx4_dev *dev, struct mlx4_icm_table *table,
   391				u64 virt, int obj_size,	u32 nobj, int reserved,
   392				int use_lowmem, int use_coherent)
   393	{
   394		int obj_per_chunk;
   395		int num_icm;
   396		unsigned chunk_size;
   397		int i;
   398		u64 size;
   399	
   400		obj_per_chunk = MLX4_TABLE_CHUNK_SIZE / obj_size;
   401		num_icm = (nobj + obj_per_chunk - 1) / obj_per_chunk;
   402	
 > 403		table->icm      = vzalloc(num_icm * sizeof(*table->icm));
   404		if (!table->icm)
   405			return -ENOMEM;
   406		table->virt     = virt;
   407		table->num_icm  = num_icm;
   408		table->num_obj  = nobj;
   409		table->obj_size = obj_size;
   410		table->lowmem   = use_lowmem;
   411		table->coherent = use_coherent;
   412		mutex_init(&table->mutex);
   413	
   414		size = (u64) nobj * obj_size;
   415		for (i = 0; i * MLX4_TABLE_CHUNK_SIZE < reserved * obj_size; ++i) {
   416			chunk_size = MLX4_TABLE_CHUNK_SIZE;
   417			if ((i + 1) * MLX4_TABLE_CHUNK_SIZE > size)
   418				chunk_size = PAGE_ALIGN(size -
   419						i * MLX4_TABLE_CHUNK_SIZE);
   420	
   421			table->icm[i] = mlx4_alloc_icm(dev, chunk_size >> PAGE_SHIFT,
   422						       (use_lowmem ? GFP_KERNEL : GFP_HIGHUSER) |
   423						       __GFP_NOWARN, use_coherent);
   424			if (!table->icm[i])
   425				goto err;
   426			if (mlx4_MAP_ICM(dev, table->icm[i], virt + i * MLX4_TABLE_CHUNK_SIZE)) {
   427				mlx4_free_icm(dev, table->icm[i], use_coherent);
   428				table->icm[i] = NULL;
   429				goto err;
   430			}
   431	
   432			/*
   433			 * Add a reference to this ICM chunk so that it never
   434			 * gets freed (since it contains reserved firmware objects).
   435			 */
   436			++table->icm[i]->refcount;
   437		}
   438	
   439		return 0;
   440	
   441	err:
   442		for (i = 0; i < num_icm; ++i)
   443			if (table->icm[i]) {
   444				mlx4_UNMAP_ICM(dev, virt + i * MLX4_TABLE_CHUNK_SIZE,
   445					       MLX4_TABLE_CHUNK_SIZE / MLX4_ICM_PAGE_SIZE);
   446				mlx4_free_icm(dev, table->icm[i], use_coherent);
   447			}
   448	
 > 449		vfree(table->icm);
   450	
   451		return -ENOMEM;
   452	}
   453	

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