linux-kernel - Re: [PATCH] IB/iser: use sector_div instead of do

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Message-ID: <564FD463.2020205@dev.mellanox.co.il>
Date:	Sat, 21 Nov 2015 04:18:11 +0200
From:	Sagi Grimberg <sagig@....mellanox.co.il>
To:	Arnd Bergmann <arnd@...db.de>, Or Gerlitz <ogerlitz@...lanox.com>,
	Sagi Grimberg <sagig@...lanox.com>
Cc:	nico@...xnic.net, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org, Roi Dayan <roid@...lanox.com>,
	Doug Ledford <dledford@...hat.com>,
	Sean Hefty <sean.hefty@...el.com>,
	Hal Rosenstock <hal.rosenstock@...il.com>,
	linux-rdma@...r.kernel.org
Subject: Re: [PATCH] IB/iser: use sector_div instead of do_div


> 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/infiniband/ulp/iser/iser_verbs.c:1296:4: note: in expansion of macro 'do_div'
> include/asm-generic/div64.h:224:22: warning: passing argument 1 of '__div64_32' from incompatible pointer type
>
> This changes the code to use sector_div instead, which always
> produces optimal code.
>
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

Thanks Arnd,

Reviewed-by: Sagi Grimberg <sagig@...lanox.com>
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