netdev - Re: [net-next 8/9] i40e: Moving variable declaration out of the loops

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Message-ID: <544A4403.9090108@cogentembedded.com>
Date:	Fri, 24 Oct 2014 16:20:19 +0400
From:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:	Jeff Kirsher <jeffrey.t.kirsher@...el.com>, davem@...emloft.net
CC:	Akeem G Abodunrin <akeem.g.abodunrin@...el.com>,
	netdev@...r.kernel.org, nhorman@...hat.com, sassmann@...hat.com,
	jogreene@...hat.com, Patrick Lu <patrick.lu@...el.com>
Subject: Re: [net-next 8/9] i40e: Moving variable declaration out of the loops

Hello.

On 10/24/2014 8:10 AM, Jeff Kirsher wrote:

> From: Akeem G Abodunrin <akeem.g.abodunrin@...el.com>

> Move the three variables out of the loop, so it only declares once.

    It's only declared once in either case. I think gcc allocates maximum 
local variable space at the start of the function, so declaring variables in 
the loop body comes with no extra price.

> Change-ID: I436913777c7da3c16dc0031b59e3ffa61de74718
> Signed-off-by: Akeem G Abodunrin <akeem.g.abodunrin@...el.com>
> Signed-off-by: Patrick Lu <patrick.lu@...el.com>
> Tested-by: Jim Young <jamesx.m.young@...el.com>
> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
> ---
>   drivers/net/ethernet/intel/i40e/i40e_main.c | 7 +++----
>   1 file changed, 3 insertions(+), 4 deletions(-)

> diff --git a/drivers/net/ethernet/intel/i40e/i40e_main.c b/drivers/net/ethernet/intel/i40e/i40e_main.c
> index 9d36d10..b0c10e0 100644
> --- a/drivers/net/ethernet/intel/i40e/i40e_main.c
> +++ b/drivers/net/ethernet/intel/i40e/i40e_main.c
> @@ -813,7 +813,10 @@ static void i40e_update_vsi_stats(struct i40e_vsi *vsi)
>   	struct i40e_eth_stats *oes;
>   	struct i40e_eth_stats *es;     /* device's eth stats */
>   	u32 tx_restart, tx_busy;
> +	struct i40e_ring *p;
>   	u32 rx_page, rx_buf;
> +	u64 bytes, packets;
> +	unsigned int start;
>   	u64 rx_p, rx_b;
>   	u64 tx_p, tx_b;
>   	u16 q;
> @@ -837,10 +840,6 @@ static void i40e_update_vsi_stats(struct i40e_vsi *vsi)
>   	rx_buf = 0;
>   	rcu_read_lock();
>   	for (q = 0; q < vsi->num_queue_pairs; q++) {
> -		struct i40e_ring *p;
> -		u64 bytes, packets;
> -		unsigned int start;
> -

WBR, Sergei

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