linux-kernel - Re: [PATCH 5/5] tty: hvc: remove HVC_IUCV

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Date:   Fri, 16 Sep 2022 08:52:19 +0200
From:   Jiri Slaby <jirislaby@...nel.org>
To:     наб <nabijaczleweli@...ijaczleweli.xyz>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Randy Dunlap <rdunlap@...radead.org>,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 5/5] tty: hvc: remove HVC_IUCV_MAGIC

On 16. 09. 22, 3:55, наб wrote:
> According to Greg, in the context of magic numbers as defined in
> magic-number.rst, "the tty layer should not need this and I'll gladly
> take patches"
> 
> This stretches that definition slightly, since it multiplexes it with
> the terminal number as a constant offset, but is equivalent
> 
> Ref: https://lore.kernel.org/linux-doc/YyMlovoskUcHLEb7@kroah.com/
> Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@...ijaczleweli.xyz>

Acked-by: Jiri Slaby <jirislaby@...nel.org>

> ---
>   drivers/tty/hvc/hvc_iucv.c | 11 +++++------
>   1 file changed, 5 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/tty/hvc/hvc_iucv.c b/drivers/tty/hvc/hvc_iucv.c
> index 32366caca662..7d49a872de48 100644
> --- a/drivers/tty/hvc/hvc_iucv.c
> +++ b/drivers/tty/hvc/hvc_iucv.c
> @@ -29,7 +29,6 @@
>   
>   
>   /* General device driver settings */
> -#define HVC_IUCV_MAGIC		0xc9e4c3e5
>   #define MAX_HVC_IUCV_LINES	HVC_ALLOC_TTY_ADAPTERS
>   #define MEMPOOL_MIN_NR		(PAGE_SIZE / sizeof(struct iucv_tty_buffer)/4)
>   
> @@ -131,9 +130,9 @@ static struct iucv_handler hvc_iucv_handler = {
>    */
>   static struct hvc_iucv_private *hvc_iucv_get_private(uint32_t num)
>   {
> -	if ((num < HVC_IUCV_MAGIC) || (num - HVC_IUCV_MAGIC > hvc_iucv_devices))
> +	if (num > hvc_iucv_devices)
>   		return NULL;
> -	return hvc_iucv_table[num - HVC_IUCV_MAGIC];
> +	return hvc_iucv_table[num];
>   }
>   
>   /**
> @@ -1072,8 +1071,8 @@ static int __init hvc_iucv_alloc(int id, unsigned int is_console)
>   	priv->is_console = is_console;
>   
>   	/* allocate hvc device */
> -	priv->hvc = hvc_alloc(HVC_IUCV_MAGIC + id, /*		  PAGE_SIZE */
> -			      HVC_IUCV_MAGIC + id, &hvc_iucv_ops, 256);
> +	priv->hvc = hvc_alloc(id, /*		 PAGE_SIZE */
> +			      id, &hvc_iucv_ops, 256);
>   	if (IS_ERR(priv->hvc)) {
>   		rc = PTR_ERR(priv->hvc);
>   		goto out_error_hvc;
> @@ -1371,7 +1370,7 @@ static int __init hvc_iucv_init(void)
>   
>   	/* register the first terminal device as console
>   	 * (must be done before allocating hvc terminal devices) */
> -	rc = hvc_instantiate(HVC_IUCV_MAGIC, IUCV_HVC_CON_IDX, &hvc_iucv_ops);
> +	rc = hvc_instantiate(0, IUCV_HVC_CON_IDX, &hvc_iucv_ops);
>   	if (rc) {
>   		pr_err("Registering HVC terminal device as "
>   		       "Linux console failed\n");

-- 
js
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