From: Sagi Grimberg <sagig@dev.mellanox.co.il>
To: Arnd Bergmann <arnd@arndb.de>, linux-scsi@vger.kernel.org
Cc: jbottomley@odin.com, martin.petersen@oracle.com,
nico@fluxnic.net, linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH] scsi: use sector_div instead of do_div
Date: Tue, 24 Nov 2015 14:50:36 +0200 [thread overview]
Message-ID: <56545D1C.6070509@dev.mellanox.co.il> (raw)
In-Reply-To: <24882658.08y4bWL6tn@wuerfel>
On 20/11/2015 18:38, Arnd Bergmann wrote:
> do_div is the wrong way to divide a sector_t, as it is less
> efficient when sector_t is 32-bit wide. With the upcoming
> do_div optimizations, the kernel starts warning about this:
>
> drivers/scsi/scsi_debug.c: In function 'dif_store':
> include/asm-generic/div64.h:207:28: warning: comparison of distinct pointer types lacks a cast
>
> This changes the code to use sector_div instead, which always
> produces optimal code.
>
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Sagi Grimberg <sagig@mellanox.com>
WARNING: multiple messages have this Message-ID (diff)
From: sagig@dev.mellanox.co.il (Sagi Grimberg)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH] scsi: use sector_div instead of do_div
Date: Tue, 24 Nov 2015 14:50:36 +0200 [thread overview]
Message-ID: <56545D1C.6070509@dev.mellanox.co.il> (raw)
In-Reply-To: <24882658.08y4bWL6tn@wuerfel>
On 20/11/2015 18:38, Arnd Bergmann wrote:
> do_div is the wrong way to divide a sector_t, as it is less
> efficient when sector_t is 32-bit wide. With the upcoming
> do_div optimizations, the kernel starts warning about this:
>
> drivers/scsi/scsi_debug.c: In function 'dif_store':
> include/asm-generic/div64.h:207:28: warning: comparison of distinct pointer types lacks a cast
>
> This changes the code to use sector_div instead, which always
> produces optimal code.
>
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Sagi Grimberg <sagig@mellanox.com>
next prev parent reply other threads:[~2015-11-24 12:50 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-11-20 16:38 [PATCH] scsi: use sector_div instead of do_div Arnd Bergmann
2015-11-20 16:38 ` Arnd Bergmann
2015-11-24 12:48 ` Johannes Thumshirn
2015-11-24 12:48 ` Johannes Thumshirn
2015-11-24 12:48 ` Johannes Thumshirn
2015-11-24 12:50 ` Sagi Grimberg [this message]
2015-11-24 12:50 ` Sagi Grimberg
2015-11-24 15:03 ` Hannes Reinecke
2015-11-24 15:03 ` Hannes Reinecke
2015-11-26 3:28 ` Martin K. Petersen
2015-11-26 3:28 ` Martin K. Petersen
2015-11-26 3:28 ` Martin K. Petersen
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