linux-kernel - Re: [PATCH 1/1] igb: Use ARRAY_SIZE instead fo sizeof(a)/sizeof(a[0])

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Message-ID: <1435641156.6661.1.camel@perches.com>
Date:	Mon, 29 Jun 2015 22:12:36 -0700
From:	Joe Perches <joe@...ches.com>
To:	Maninder Singh <maninder1.s@...sung.com>
Cc:	jeffrey.t.kirsher@...el.com, jesse.brandeburg@...el.com,
	shannon.nelson@...el.com, carolyn.wyborny@...el.com,
	donald.c.skidmore@...el.com, matthew.vick@...el.com,
	john.ronciak@...el.com, mitch.a.williams@...el.com,
	intel-wired-lan@...ts.osuosl.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, pankaj.m@...sung.com
Subject: Re: [PATCH 1/1] igb: Use ARRAY_SIZE instead fo
 sizeof(a)/sizeof(a[0])

On Tue, 2015-06-30 at 10:25 +0530, Maninder Singh wrote:
> Use ARRAY_SIZE instead fo sizeof(a)/sizeof(a[0])

I think all of these #defines should be removed instead
as they are all used only once.

> diff --git a/drivers/net/ethernet/intel/igb/e1000_phy.c b/drivers/net/ethernet/intel/igb/e1000_phy.c
[]
> @@ -37,8 +37,7 @@ static s32  igb_set_master_slave_mode(struct e1000_hw *hw);
>  static const u16 e1000_m88_cable_length_table[] = {
>  	0, 50, 80, 110, 140, 140, E1000_CABLE_LENGTH_UNDEFINED };
>  #define M88E1000_CABLE_LENGTH_TABLE_SIZE \
> -	(sizeof(e1000_m88_cable_length_table) / \
> -	sizeof(e1000_m88_cable_length_table[0]))
> +	ARRAY_SIZE(e1000_m88_cable_length_table)
>  
>  static const u16 e1000_igp_2_cable_length_table[] = {
>  	0, 0, 0, 0, 0, 0, 0, 0, 3, 5, 8, 11, 13, 16, 18, 21,
> @@ -50,8 +49,7 @@ static const u16 e1000_igp_2_cable_length_table[] = {
>  	83, 89, 95, 100, 105, 109, 113, 116, 119, 122, 124,
>  	104, 109, 114, 118, 121, 124};
>  #define IGP02E1000_CABLE_LENGTH_TABLE_SIZE \
> -	(sizeof(e1000_igp_2_cable_length_table) / \
> -	 sizeof(e1000_igp_2_cable_length_table[0]))
> +	ARRAY_SIZE(e1000_igp_2_cable_length_table)
>  
>  /**
>   *  igb_check_reset_block - Check if PHY reset is blocked



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