linux-kernel - Re: [PATCH 1/2] scsi: lpfc: avoid harmless comparison warning

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Date:	Thu, 16 Jun 2016 09:39:10 +0200
From:	Johannes Thumshirn <jthumshirn@...e.de>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	"James E.J. Bottomley" <jejb@...ux.vnet.ibm.com>,
	"Martin K. Petersen" <martin.petersen@...cle.com>,
	James Smart <james.smart@...gotech.com>,
	Dick Kennedy <dick.kennedy@...gotech.com>,
	Hannes Reinicke <hare@...e.de>,
	James Bottomley <JBottomley@...n.com>,
	linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] scsi: lpfc: avoid harmless comparison warning

On Wed, Jun 15, 2016 at 10:42:17PM +0200, Arnd Bergmann wrote:
> When building with -Wextra, we get a lot of warnings for the lpfc driver
> concerning expressions that are always true, starting with:
> 
> drivers/scsi/lpfc/lpfc_attr.c: In function 'lpfc_enable_npiv_init':
> drivers/scsi/lpfc/lpfc_attr.c:2786:77: error: comparison of unsigned expression >= 0 is always true [-Werror=type-limits]
> drivers/scsi/lpfc/lpfc_attr.c: In function 'lpfc_enable_rrq_init':
> drivers/scsi/lpfc/lpfc_attr.c:2802:76: error: comparison of unsigned expression >= 0 is always true [-Werror=type-limits]
> drivers/scsi/lpfc/lpfc_attr.c: In function 'lpfc_suppress_link_up_init':
> drivers/scsi/lpfc/lpfc_attr.c:2812:2050: error: comparison of unsigned expression >= 0 is always true [-Werror=type-limits]
> drivers/scsi/lpfc/lpfc_attr.c: In function 'lpfc_log_verbose_init':
> drivers/scsi/lpfc/lpfc_attr.c:3064:1930: error: comparison of unsigned expression >= 0 is always true [-Werror=type-limits]
> 
> The code works as intented, but it would be nice to shut up the
> warning so we don't clutter up build logs with this. Using a
> separate inline function for it makes it clear to the compiler
> that the comparison is necessary in the caller but still lets
> it do the constant-folding.
> 
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

Reviewed-by: Johannes Thumshirn <jthumshirn@...e.de>

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