linux-kernel - Re: [PATCH ipmi/kcs_bmc v1] ipmi: kcs_bmc: optimize the data buffers allocation

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Date:   Tue, 3 Apr 2018 14:00:29 +0800
From:   "Wang, Haiyue" <haiyue.wang@...ux.intel.com>
To:     minyard@....org, openipmi-developer@...ts.sourceforge.net,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH ipmi/kcs_bmc v1] ipmi: kcs_bmc: optimize the data buffers
 allocation

Hi Corey,

The 4.17 merge window is opened now, this patch is not yet in linux-next 
tree,

so it will be merged into 4.18 ?

Thanks & Regards,

Haiyue

On 2018-03-15 20:20, Haiyue Wang wrote:
> Allocate a continuous memory block for the three KCS data buffers with
> related index assignment.
>
> Signed-off-by: Haiyue Wang <haiyue.wang@...ux.intel.com>
> ---
>   drivers/char/ipmi/kcs_bmc.c | 10 ++++++----
>   1 file changed, 6 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/char/ipmi/kcs_bmc.c b/drivers/char/ipmi/kcs_bmc.c
> index fbfc05e..dc19c0d 100644
> --- a/drivers/char/ipmi/kcs_bmc.c
> +++ b/drivers/char/ipmi/kcs_bmc.c
> @@ -435,6 +435,7 @@ static const struct file_operations kcs_bmc_fops = {
>   struct kcs_bmc *kcs_bmc_alloc(struct device *dev, int sizeof_priv, u32 channel)
>   {
>   	struct kcs_bmc *kcs_bmc;
> +	void *buf;
>   
>   	kcs_bmc = devm_kzalloc(dev, sizeof(*kcs_bmc) + sizeof_priv, GFP_KERNEL);
>   	if (!kcs_bmc)
> @@ -448,11 +449,12 @@ struct kcs_bmc *kcs_bmc_alloc(struct device *dev, int sizeof_priv, u32 channel)
>   	mutex_init(&kcs_bmc->mutex);
>   	init_waitqueue_head(&kcs_bmc->queue);
>   
> -	kcs_bmc->data_in = devm_kmalloc(dev, KCS_MSG_BUFSIZ, GFP_KERNEL);
> -	kcs_bmc->data_out = devm_kmalloc(dev, KCS_MSG_BUFSIZ, GFP_KERNEL);
> -	kcs_bmc->kbuffer = devm_kmalloc(dev, KCS_MSG_BUFSIZ, GFP_KERNEL);
> -	if (!kcs_bmc->data_in || !kcs_bmc->data_out || !kcs_bmc->kbuffer)
> +	buf = devm_kmalloc_array(dev, 3, KCS_MSG_BUFSIZ, GFP_KERNEL);
> +	if (!buf)
>   		return NULL;
> +	kcs_bmc->data_in  = buf;
> +	kcs_bmc->data_out = buf + KCS_MSG_BUFSIZ;
> +	kcs_bmc->kbuffer  = buf + KCS_MSG_BUFSIZ * 2;
>   
>   	kcs_bmc->miscdev.minor = MISC_DYNAMIC_MINOR;
>   	kcs_bmc->miscdev.name = dev_name(dev);