netdev - Re: [patch net-next RFC v2 07/11] mlxsw: spectrum: Register KVD resources with devlink

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Date:   Tue, 14 Nov 2017 17:15:22 -0700
From:   David Ahern <dsa@...ulusnetworks.com>
To:     Jiri Pirko <jiri@...nulli.us>, netdev@...r.kernel.org
Cc:     davem@...emloft.net, mlxsw@...lanox.com, andrew@...n.ch,
        vivien.didelot@...oirfairelinux.com, f.fainelli@...il.com,
        michael.chan@...adcom.com, ganeshgr@...lsio.com,
        saeedm@...lanox.com, matanb@...lanox.com, leonro@...lanox.com,
        idosch@...lanox.com, jakub.kicinski@...ronome.com, ast@...nel.org,
        daniel@...earbox.net, simon.horman@...ronome.com,
        pieter.jansenvanvuuren@...ronome.com, john.hurley@...ronome.com,
        alexander.h.duyck@...el.com, linville@...driver.com,
        gospo@...adcom.com, steven.lin1@...adcom.com, yuvalm@...lanox.com,
        ogerlitz@...lanox.com, roopa@...ulusnetworks.com
Subject: Re: [patch net-next RFC v2 07/11] mlxsw: spectrum: Register KVD
 resources with devlink

On 11/14/17 9:18 AM, Jiri Pirko wrote:
> +static int
> +mlxsw_sp_resource_kvd_size_validate(struct devlink *devlink, u64 size,
> +				    struct list_head *resource_list,
> +				    struct netlink_ext_ack *extack)
> +{
> +	struct mlxsw_core *mlxsw_core = devlink_priv(devlink);
> +	u32 kvd_size, single_size, double_size, linear_size;
> +	struct devlink_resource *resource;
> +
> +	kvd_size = MLXSW_CORE_RES_GET(mlxsw_core, KVD_SIZE);
> +	if (kvd_size != size) {
> +		NL_SET_ERR_MSG(extack, MLXSW_SP_PREFIX "kvd size cannot be chagned");
> +		return -EINVAL;
> +	}
> +
> +	list_for_each_entry(resource, resource_list, list) {
> +		switch (resource->id) {
> +		case MLXSW_SP_RESOURCE_KVD_LINEAR:
> +			linear_size = resource->size_new;
> +			break;
> +		case MLXSW_SP_RESOURCE_KVD_HASH_SINGLE:
> +			single_size = resource->size_new;
> +			break;
> +		case MLXSW_SP_RESOURCE_KVD_HASH_DOUBLE:
> +			double_size = resource->size_new;
> +			break;
> +		}
> +	}
> +
> +	/* Overlap is not supported */
> +	if (linear_size + single_size + double_size > kvd_size) {
> +		NL_SET_ERR_MSG(extack, MLXSW_SP_PREFIX "Overlap is not supported");
> +		return -EINVAL;
> +	}
> +
> +	return 0;
> +}
> +

gcc warnings due to the above:

/home/dsa/kernel-3.git/drivers/net/ethernet/mellanox/mlxsw/spectrum.c:
In function ‘mlxsw_sp_resource_kvd_size_validate’:
/home/dsa/kernel-3.git/drivers/net/ethernet/mellanox/mlxsw/spectrum.c:3974:32:
warning: ‘linear_size’ may be used uninitialized in this function
[-Wmaybe-uninitialized]
  if (linear_size + single_size + double_size > kvd_size) {
                                ^
/home/dsa/kernel-3.git/drivers/net/ethernet/mellanox/mlxsw/spectrum.c:3950:29:
warning: ‘double_size’ may be used uninitialized in this function
[-Wmaybe-uninitialized]
  u32 kvd_size, single_size, double_size, linear_size;
                             ^
/home/dsa/kernel-3.git/drivers/net/ethernet/mellanox/mlxsw/spectrum.c:3950:16:
warning: ‘single_size’ may be used uninitialized in this function
[-Wmaybe-uninitialized]
  u32 kvd_size, single_size, double_size, linear_size;
                ^