linux-kernel - Re: [PATCH] scsi/be2iscsi: Fix logical-not-parentheses compilation warning

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Date:	Tue, 04 Aug 2015 09:42:45 +0200
From:	Johannes Thumshirn <jthumshirn@...e.de>
To:	Tomer Barletz <barletz@...il.com>
Cc:	jayamohan.kallickal@...gotech.com, minh.tran@...gotech.com,
	sony.john-n@...gotech.com, JBottomley@...n.com,
	linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] scsi/be2iscsi: Fix logical-not-parentheses compilation warning


Ok, it has cost me quite some time to figure out what "!length > 0" is
actually doing, but looks ok to me.


Tomer Barletz <barletz@...il.com> writes:

> This fixes the following warning seen with GCC v5.1:
> warning: logical not is only applied to the left hand side of
> comparison [-Wlogical-not-parentheses].
>
> Signed-off-by: Tomer Barletz <barletz@...il.com>
> ---
>  drivers/scsi/be2iscsi/be_main.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/scsi/be2iscsi/be_main.c b/drivers/scsi/be2iscsi/be_main.c
> index 7a6dbfb..ff8d40e 100644
> --- a/drivers/scsi/be2iscsi/be_main.c
> +++ b/drivers/scsi/be2iscsi/be_main.c
> @@ -3184,7 +3184,7 @@ be_sgl_create_contiguous(void *virtual_address,
>  {
>  	WARN_ON(!virtual_address);
>  	WARN_ON(!physical_address);
> -	WARN_ON(!length > 0);
> +	WARN_ON(0 == length);

Please write WARN_ON(length == 0);

>  	WARN_ON(!sgl);
>  
>  	sgl->va = virtual_address;


Given the above is swapped:
Reviewed-by: Johannes Thumshirn <jthumshirn@...e.de>

-- 
Johannes Thumshirn                                           Storage
jthumshirn@...e.de                                 +49 911 74053 689
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