linux-kernel - Re: [PATCH 3/5] tty: srmcons: use 'count' directly in srmcons_do

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Message-ID: <c06cb71-575f-1d6b-aed-49e4bbab444@linux.intel.com>
Date:   Tue, 28 Nov 2023 15:26:03 +0200 (EET)
From:   Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
To:     "Jiri Slaby (SUSE)" <jirislaby@...nel.org>
cc:     gregkh@...uxfoundation.org, linux-serial@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Richard Henderson <richard.henderson@...aro.org>,
        Ivan Kokshaysky <ink@...assic.park.msu.ru>,
        Matt Turner <mattst88@...il.com>, linux-alpha@...r.kernel.org
Subject: Re: [PATCH 3/5] tty: srmcons: use 'count' directly in
 srmcons_do_write()

On Mon, 27 Nov 2023, Jiri Slaby (SUSE) wrote:

> Similarly to 'buf' in the previous patch, there is no need to have a
> separate counter ('remaining') in srmcons_do_write(). 'count' can be
> used directly which simplifies the code a bit.
> 
> Note that the type of the current count ('c') is changed from 'long' to
> 'size_t' so that:
> 1) it is prepared for the upcoming change of 'count's type, and
> 2) is unsigned.
> 
> Signed-off-by: Jiri Slaby (SUSE) <jirislaby@...nel.org>
> Reviewed-by: Richard Henderson <richard.henderson@...aro.org>
> Cc: Ivan Kokshaysky <ink@...assic.park.msu.ru>
> Cc: Matt Turner <mattst88@...il.com>
> Cc: linux-alpha@...r.kernel.org
> ---
> 
> Notes:
>     [v2] reordered so that it makes sense
> 
>  arch/alpha/kernel/srmcons.c | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/arch/alpha/kernel/srmcons.c b/arch/alpha/kernel/srmcons.c
> index de896fa9829e..32bc098de7da 100644
> --- a/arch/alpha/kernel/srmcons.c
> +++ b/arch/alpha/kernel/srmcons.c
> @@ -92,24 +92,24 @@ static void
>  srmcons_do_write(struct tty_port *port, const char *buf, int count)
>  {
>  	static char str_cr[1] = "\r";
> -	long c, remaining = count;
> +	size_t c;
>  	srmcons_result result;
>  	int need_cr;
>  
> -	while (remaining > 0) {
> +	while (count > 0) {
>  		need_cr = 0;
>  		/* 
>  		 * Break it up into reasonable size chunks to allow a chance
>  		 * for input to get in
>  		 */
> -		for (c = 0; c < min_t(long, 128L, remaining) && !need_cr; c++)
> +		for (c = 0; c < min_t(size_t, 128U, count) && !need_cr; c++)
>  			if (buf[c] == '\n')
>  				need_cr = 1;
>  		
>  		while (c > 0) {
>  			result.as_long = callback_puts(0, buf, c);
>  			c -= result.bits.c;
> -			remaining -= result.bits.c;
> +			count -= result.bits.c;
>  			buf += result.bits.c;
>  
>  			/*
> 

Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>

-- 
 i.