linux-kernel - Re: [Intel-wired-lan] [PATCH] ice: switch: Simplify memory allocation

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Date:   Tue, 6 Sep 2022 12:45:00 +0200
From:   Michal Swiatkowski <michal.swiatkowski@...ux.intel.com>
To:     Christophe JAILLET <christophe.jaillet@...adoo.fr>
Cc:     Jesse Brandeburg <jesse.brandeburg@...el.com>,
        Tony Nguyen <anthony.l.nguyen@...el.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        intel-wired-lan@...ts.osuosl.org, kernel-janitors@...r.kernel.org,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [Intel-wired-lan] [PATCH] ice: switch: Simplify memory allocation

On Sun, Sep 04, 2022 at 04:18:02PM +0200, Christophe JAILLET wrote:
> 'rbuf' is locale to the ice_get_initial_sw_cfg() function.
> There is no point in using devm_kzalloc()/devm_kfree().
> 
> use kzalloc()/kfree() instead.
> 
> Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
> ---
> As a side effect, it also require less memory. devm_kzalloc() has a small
> memory overhead, and requesting ICE_SW_CFG_MAX_BUF_LEN (i.e. 2048) bytes,
> 4096 are really allocated.
> ---
>  drivers/net/ethernet/intel/ice/ice_switch.c | 6 ++----
>  1 file changed, 2 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/net/ethernet/intel/ice/ice_switch.c b/drivers/net/ethernet/intel/ice/ice_switch.c
> index 697feb89188c..eb6e19deb70d 100644
> --- a/drivers/net/ethernet/intel/ice/ice_switch.c
> +++ b/drivers/net/ethernet/intel/ice/ice_switch.c
> @@ -2274,9 +2274,7 @@ int ice_get_initial_sw_cfg(struct ice_hw *hw)
>  	int status;
>  	u16 i;
>  
> -	rbuf = devm_kzalloc(ice_hw_to_dev(hw), ICE_SW_CFG_MAX_BUF_LEN,
> -			    GFP_KERNEL);
> -
> +	rbuf = kzalloc(ICE_SW_CFG_MAX_BUF_LEN, GFP_KERNEL);
>  	if (!rbuf)
>  		return -ENOMEM;
>  
> @@ -2324,7 +2322,7 @@ int ice_get_initial_sw_cfg(struct ice_hw *hw)
>  		}
>  	} while (req_desc && !status);
>  
> -	devm_kfree(ice_hw_to_dev(hw), rbuf);
> +	kfree(rbuf);
>  	return status;
>  }
>  
> -- 
> 2.34.1
> 

Thanks for catching that
Reviewed-by: Michal Swiatkowski <michal.swiatkowski@...ux.intel.com>

> _______________________________________________
> Intel-wired-lan mailing list
> Intel-wired-lan@...osl.org
> https://lists.osuosl.org/mailman/listinfo/intel-wired-lan

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