linux-kernel - Re: [PATCH 01/11] EDAC/mc: Use int type for parameters of edac_mc

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Message-ID: <b87a569d-8170-2b8b-d7c8-60bc782f5f2e@suse.com>
Date:   Mon, 6 Apr 2020 13:38:47 +0200
From:   Matthias Brugger <mbrugger@...e.com>
To:     Robert Richter <rrichter@...vell.com>,
        Borislav Petkov <bp@...en8.de>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Tony Luck <tony.luck@...el.com>
Cc:     James Morse <james.morse@....com>,
        Aristeu Rozanski <aris@...hat.com>, linux-edac@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 01/11] EDAC/mc: Use int type for parameters of
 edac_mc_alloc()

On 06/03/2020 16:13, Robert Richter wrote:
> Most iterators use int type as index. mci->mc_idx is also type int. So
> use int type for parameters of edac_mc_alloc(). Extend the range check
> to check for negative values. There is a type cast now when assigning
> variable n_layers to mci->n_layer, it is safe due to the range check.
> 
> While at it, rename the users of edac_mc_alloc() to mc_idx as this
> fits better here.
> 
> Signed-off-by: Robert Richter <rrichter@...vell.com>

Reviewed-by: Matthias Brugger <mbrugger@...e.com>

> ---
>  drivers/edac/edac_mc.c | 7 +++----
>  drivers/edac/edac_mc.h | 6 +++---
>  2 files changed, 6 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/edac/edac_mc.c b/drivers/edac/edac_mc.c
> index 75ede27bdf6a..8bd3d00b4385 100644
> --- a/drivers/edac/edac_mc.c
> +++ b/drivers/edac/edac_mc.c
> @@ -444,8 +444,7 @@ static int edac_mc_alloc_dimms(struct mem_ctl_info *mci)
>  	return 0;
>  }
>  
> -struct mem_ctl_info *edac_mc_alloc(unsigned int mc_num,
> -				   unsigned int n_layers,
> +struct mem_ctl_info *edac_mc_alloc(int mc_idx, int n_layers,
>  				   struct edac_mc_layer *layers,
>  				   unsigned int sz_pvt)
>  {
> @@ -456,7 +455,7 @@ struct mem_ctl_info *edac_mc_alloc(unsigned int mc_num,
>  	void *pvt, *ptr = NULL;
>  	bool per_rank = false;
>  
> -	if (WARN_ON(n_layers > EDAC_MAX_LAYERS || n_layers == 0))
> +	if (WARN_ON(mc_idx < 0 || n_layers < 1 || n_layers > EDAC_MAX_LAYERS))
>  		return NULL;
>  
>  	/*
> @@ -505,7 +504,7 @@ struct mem_ctl_info *edac_mc_alloc(unsigned int mc_num,
>  	pvt = sz_pvt ? (((char *)mci) + ((unsigned long)pvt)) : NULL;
>  
>  	/* setup index and various internal pointers */
> -	mci->mc_idx = mc_num;
> +	mci->mc_idx = mc_idx;
>  	mci->tot_dimms = tot_dimms;
>  	mci->pvt_info = pvt;
>  	mci->n_layers = n_layers;
> diff --git a/drivers/edac/edac_mc.h b/drivers/edac/edac_mc.h
> index 881b00eadf7a..4815f50afea0 100644
> --- a/drivers/edac/edac_mc.h
> +++ b/drivers/edac/edac_mc.h
> @@ -98,7 +98,7 @@ do {									\
>  /**
>   * edac_mc_alloc() - Allocate and partially fill a struct &mem_ctl_info.
>   *
> - * @mc_num:		Memory controller number
> + * @mc_idx:		Memory controller number
>   * @n_layers:		Number of MC hierarchy layers
>   * @layers:		Describes each layer as seen by the Memory Controller
>   * @sz_pvt:		size of private storage needed
> @@ -122,8 +122,8 @@ do {									\
>   *	On success, return a pointer to struct mem_ctl_info pointer;
>   *	%NULL otherwise
>   */
> -struct mem_ctl_info *edac_mc_alloc(unsigned int mc_num,
> -				   unsigned int n_layers,
> +struct mem_ctl_info *edac_mc_alloc(int mc_idx,
> +				   int n_layers,
>  				   struct edac_mc_layer *layers,
>  				   unsigned int sz_pvt);
>  
>