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From: Sascha Hauer <sha@pengutronix.de>
To: Ahmad Fatoum <a.fatoum@pengutronix.de>
Cc: barebox@lists.infradead.org
Subject: Re: [PATCH] include: linux/iopoll.h: silence warning when timeout_us contains *
Date: Tue, 10 Jan 2023 15:41:57 +0100	[thread overview]
Message-ID: <20230110144157.GJ28911@pengutronix.de> (raw)
In-Reply-To: <20230109160057.2223325-1-a.fatoum@pengutronix.de>

On Mon, Jan 09, 2023 at 05:00:57PM +0100, Ahmad Fatoum wrote:
> We evaluate timeout_us for truthiness to determine whether we are
> entering an infinite poll loop. When timeout_us contains a
> multiplication, GCC will warn about it and suggest replacing the *
> with &&. Silence this warning by comparing directly against 0.
> 
> Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
> ---
>  include/linux/iopoll.h | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/include/linux/iopoll.h b/include/linux/iopoll.h
> index 8bf912e173b3..b8c55583f97f 100644
> --- a/include/linux/iopoll.h
> +++ b/include/linux/iopoll.h
> @@ -32,13 +32,13 @@
>  #define read_poll_timeout(op, val, cond, timeout_us, args...)	\
>  ({ \
>  	uint64_t start; \
> -	if (!IN_PBL && timeout_us) \
> +	if (!IN_PBL && timeout_us != 0) \

You should rather put timeout_us in brackets.

Sascha

>  		start = get_time_ns(); \
>  	for (;;) { \
>  		(val) = op(args); \
>  		if (cond) \
>  			break; \
> -		if (!IN_PBL && timeout_us && \
> +		if (!IN_PBL && timeout_us != 0 && \
>  		    is_timeout(start, ((timeout_us) * USECOND))) { \
>  			(val) = op(args); \
>  			break; \
> -- 
> 2.30.2
> 
> 
> 

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  parent reply	other threads:[~2023-01-10 14:43 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-01-09 16:00 Ahmad Fatoum
2023-01-09 18:02 ` [PATCH] fixup! " Ahmad Fatoum
2023-01-10 14:42   ` Sascha Hauer
2023-01-10 14:41 ` Sascha Hauer [this message]
2023-01-10 16:40   ` [PATCH] " Ahmad Fatoum
2023-01-11  7:39     ` Sascha Hauer

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