Re: [PATCH 13/14] iopoll: avoid -Wint-in-bool-context warning

[Joe Perches]

On Fri, 2017-07-14 at 11:31 +0200, Arnd Bergmann wrote:
> When we pass the result of a multiplication as the timeout, we
> can get a warning:
> 
> drivers/mmc/host/bcm2835.c:596:149: error: '*' in boolean context, suggest '&&' instead [-Werror=int-in-bool-context]
> drivers/mfd/arizona-core.c:247:195: error: '*' in boolean context, suggest '&&' instead [-Werror=int-in-bool-context]
> 
> This is easy to avoid by comparing the timeout to zero instead,
> making it a boolean expression.

Perhaps this is better as != 0 if the multiply is signed.

> diff --git a/include/linux/iopoll.h b/include/linux/iopoll.h
[]
> @@ -48,7 +48,8 @@
>  		(val) = op(addr); \
>  		if (cond) \
>  			break; \
> -		if (timeout_us && ktime_compare(ktime_get(), timeout) > 0) { \
> +		if ((timeout_us) > 0 && \
> +		    ktime_compare(ktime_get(), timeout) > 0) { \
>  			(val) = op(addr); \
>  			break; \
>  		} \

etc...