Re: [dpdk-dev] [PATCH] igb_uio: use macros for array size calculation

["Ananyev, Konstantin" <konstantin.ananyev@intel.com>]

> -----Original Message-----
> From: dev [mailto:dev-bounces@dpdk.org] On Behalf Of Ferruh Yigit
> Sent: Thursday, March 03, 2016 5:08 PM
> To: dev@dpdk.org
> Subject: [dpdk-dev] [PATCH] igb_uio: use macros for array size calculation
> 
> Minor code cleanup.
> Remove array size calculations and remove unnecessary assignment.
> 
> Signed-off-by: Ferruh Yigit <ferruh.yigit@intel.com>
> ---
>  lib/librte_eal/linuxapp/igb_uio/igb_uio.c | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/lib/librte_eal/linuxapp/igb_uio/igb_uio.c b/lib/librte_eal/linuxapp/igb_uio/igb_uio.c
> index 3374e44..563c57b 100644
> --- a/lib/librte_eal/linuxapp/igb_uio/igb_uio.c
> +++ b/lib/librte_eal/linuxapp/igb_uio/igb_uio.c
> @@ -58,7 +58,7 @@ struct rte_uio_pci_dev {
>  	enum rte_intr_mode mode;
>  };
> 
> -static char *intr_mode = NULL;
> +static char *intr_mode;
>  static enum rte_intr_mode igbuio_intr_mode_preferred = RTE_INTR_MODE_MSIX;
> 
>  /* sriov sysfs */
> @@ -332,7 +332,7 @@ igbuio_pci_setup_iomem(struct pci_dev *dev, struct uio_info *info,
>  	unsigned long addr, len;
>  	void *internal_addr;
> 
> -	if (sizeof(info->mem) / sizeof(info->mem[0]) <= n)
> +	if (n >= MAX_UIO_MAPS)

Why using hardcoded value is better than sizeof()?
As I can see below there is a macro ARRAY_SIZE, why not to use it here then?
Konstantin

>  		return -EINVAL;
> 
>  	addr = pci_resource_start(dev, pci_bar);
> @@ -357,7 +357,7 @@ igbuio_pci_setup_ioport(struct pci_dev *dev, struct uio_info *info,
>  {
>  	unsigned long addr, len;
> 
> -	if (sizeof(info->port) / sizeof(info->port[0]) <= n)
> +	if (n >= MAX_UIO_PORT_REGIONS)
>  		return -EINVAL;
> 
>  	addr = pci_resource_start(dev, pci_bar);
> @@ -402,7 +402,7 @@ igbuio_setup_bars(struct pci_dev *dev, struct uio_info *info)
>  	iom = 0;
>  	iop = 0;
> 
> -	for (i = 0; i != sizeof(bar_names) / sizeof(bar_names[0]); i++) {
> +	for (i = 0; i < ARRAY_SIZE(bar_names); i++) {
>  		if (pci_resource_len(dev, i) != 0 &&
>  				pci_resource_start(dev, i) != 0) {
>  			flags = pci_resource_flags(dev, i);
> --
> 2.5.0