linux-kernel - Re: [PATCH] dax/kmem: Pass valid argument to memory_group_register

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Message-ID: <ZJIz07hQiXr/MghO@aschofie-mobl2>
Date:   Tue, 20 Jun 2023 16:18:43 -0700
From:   Alison Schofield <alison.schofield@...el.com>
To:     Tarun Sahu <tsahu@...ux.ibm.com>
Cc:     nvdimm@...ts.linux.dev, linux-cxl@...r.kernel.org,
        linux-kernel@...r.kernel.org, dave.jiang@...el.com,
        dan.j.williams@...el.com, vishal.l.verma@...el.com,
        aneesh.kumar@...ux.ibm.com, jaypatel@...ux.ibm.com
Subject: Re: [PATCH] dax/kmem: Pass valid argument to
 memory_group_register_static

On Tue, Jun 20, 2023 at 07:33:32PM +0530, Tarun Sahu wrote:
> memory_group_register_static takes maximum number of pages as the argument
> while dev_dax_kmem_probe passes total_len (in bytes) as the argument.

This sounds like a fix. An explanation of the impact and a fixes tag
may be needed. Also, wondering how you found it.

Alison

> 
> Signed-off-by: Tarun Sahu <tsahu@...ux.ibm.com>
> ---
>  drivers/dax/kmem.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/dax/kmem.c b/drivers/dax/kmem.c
> index 7b36db6f1cbd..898ca9505754 100644
> --- a/drivers/dax/kmem.c
> +++ b/drivers/dax/kmem.c
> @@ -99,7 +99,7 @@ static int dev_dax_kmem_probe(struct dev_dax *dev_dax)
>  	if (!data->res_name)
>  		goto err_res_name;
>  
> -	rc = memory_group_register_static(numa_node, total_len);
> +	rc = memory_group_register_static(numa_node, PFN_UP(total_len));
>  	if (rc < 0)
>  		goto err_reg_mgid;
>  	data->mgid = rc;
> -- 
> 2.31.1
>