linux-kernel - Re: [PATCH -next] nubus: Rename pde_data var to fix conflict with external function

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Date:   Fri, 26 Nov 2021 08:50:00 +1100 (AEDT)
From:   Finn Thain <fthain@...ux-m68k.org>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
cc:     Stephen Rothwell <sfr@...b.auug.org.au>,
        Muchun Song <songmuchun@...edance.com>,
        Christian Brauner <christian.brauner@...ntu.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux-m68k@...ts.linux-m68k.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH -next] nubus: Rename pde_data var to fix conflict with
 external function


On Thu, 25 Nov 2021, Geert Uytterhoeven wrote:

> In file included from drivers/nubus/proc.c:24:
> drivers/nubus/proc.c: In function ‘nubus_proc_rsrc_show’:
> ./include/linux/proc_fs.h:123:21: error: called object ‘pde_data’ is not a function or function pointer
>   123 | #define PDE_DATA(i) pde_data(i)
>       |                     ^~~~~~~~
> drivers/nubus/proc.c:112:13: note: in expansion of macro ‘PDE_DATA’
>   112 |  pde_data = PDE_DATA(inode);
>       |             ^~~~~~~~
> drivers/nubus/proc.c:110:30: note: declared here
>   110 |  struct nubus_proc_pde_data *pde_data;
>       |                              ^~~~~~~~
> 
> Fix this by renaming the local variable to "pde".  Do this everywhere
> for consistency.
> 
> Reported-by: noreply@...erman.id.au
> Fixes: e7e935db128e724f ("fs: proc: store PDE()->data into inode->i_private")
> Signed-off-by: Geert Uytterhoeven <geert@...ux-m68k.org>

Acked-by: Finn Thain <fthain@...ux-m68k.org>

> ---
> Not fixed by commit 5de6353a96bec91d ("proc: remove PDE_DATA()
> completely"), which just removes the macro indirection.
> ---
>  drivers/nubus/proc.c | 36 ++++++++++++++++++------------------
>  1 file changed, 18 insertions(+), 18 deletions(-)
> 
> diff --git a/drivers/nubus/proc.c b/drivers/nubus/proc.c
> index 22fb11da519bfc43..aff1c5d257cd8183 100644
> --- a/drivers/nubus/proc.c
> +++ b/drivers/nubus/proc.c
> @@ -93,30 +93,30 @@ struct nubus_proc_pde_data {
>  static struct nubus_proc_pde_data *
>  nubus_proc_alloc_pde_data(unsigned char *ptr, unsigned int size)
>  {
> -	struct nubus_proc_pde_data *pde_data;
> +	struct nubus_proc_pde_data *pde;
>  
> -	pde_data = kmalloc(sizeof(*pde_data), GFP_KERNEL);
> -	if (!pde_data)
> +	pde = kmalloc(sizeof(*pde), GFP_KERNEL);
> +	if (!pde)
>  		return NULL;
>  
> -	pde_data->res_ptr = ptr;
> -	pde_data->res_size = size;
> -	return pde_data;
> +	pde->res_ptr = ptr;
> +	pde->res_size = size;
> +	return pde;
>  }
>  
>  static int nubus_proc_rsrc_show(struct seq_file *m, void *v)
>  {
>  	struct inode *inode = m->private;
> -	struct nubus_proc_pde_data *pde_data;
> +	struct nubus_proc_pde_data *pde;
>  
> -	pde_data = pde_data(inode);
> -	if (!pde_data)
> +	pde = pde_data(inode);
> +	if (!pde)
>  		return 0;
>  
> -	if (pde_data->res_size > m->size)
> +	if (pde->res_size > m->size)
>  		return -EFBIG;
>  
> -	if (pde_data->res_size) {
> +	if (pde->res_size) {
>  		int lanes = (int)proc_get_parent_data(inode);
>  		struct nubus_dirent ent;
>  
> @@ -124,11 +124,11 @@ static int nubus_proc_rsrc_show(struct seq_file *m, void *v)
>  			return 0;
>  
>  		ent.mask = lanes;
> -		ent.base = pde_data->res_ptr;
> +		ent.base = pde->res_ptr;
>  		ent.data = 0;
> -		nubus_seq_write_rsrc_mem(m, &ent, pde_data->res_size);
> +		nubus_seq_write_rsrc_mem(m, &ent, pde->res_size);
>  	} else {
> -		unsigned int data = (unsigned int)pde_data->res_ptr;
> +		unsigned int data = (unsigned int)pde->res_ptr;
>  
>  		seq_putc(m, data >> 16);
>  		seq_putc(m, data >> 8);
> @@ -142,18 +142,18 @@ void nubus_proc_add_rsrc_mem(struct proc_dir_entry *procdir,
>  			     unsigned int size)
>  {
>  	char name[9];
> -	struct nubus_proc_pde_data *pde_data;
> +	struct nubus_proc_pde_data *pde;
>  
>  	if (!procdir)
>  		return;
>  
>  	snprintf(name, sizeof(name), "%x", ent->type);
>  	if (size)
> -		pde_data = nubus_proc_alloc_pde_data(nubus_dirptr(ent), size);
> +		pde = nubus_proc_alloc_pde_data(nubus_dirptr(ent), size);
>  	else
> -		pde_data = NULL;
> +		pde = NULL;
>  	proc_create_single_data(name, S_IFREG | 0444, procdir,
> -			nubus_proc_rsrc_show, pde_data);
> +			nubus_proc_rsrc_show, pde);
>  }
>  
>  void nubus_proc_add_rsrc(struct proc_dir_entry *procdir,
>