linux-kernel - Re: [PATCH] mlx5: avoid 64-bit division

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Message-ID: <20190528140145.GO4633@mtr-leonro.mtl.com>
Date:   Tue, 28 May 2019 17:01:45 +0300
From:   Leon Romanovsky <leon@...nel.org>
To:     Michal Kubecek <mkubecek@...e.cz>
Cc:     Doug Ledford <dledford@...hat.com>, Jason Gunthorpe <jgg@...pe.ca>,
        Ariel Levkovich <lariel@...lanox.com>,
        linux-rdma@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mlx5: avoid 64-bit division

On Mon, May 20, 2019 at 02:28:35PM +0300, Leon Romanovsky wrote:
> On Mon, May 20, 2019 at 01:19:02PM +0200, Michal Kubecek wrote:
> > Commit 25c13324d03d ("IB/mlx5: Add steering SW ICM device memory type")
> > breaks i386 build by introducing three 64-bit divisions. As the divisor
> > is MLX5_SW_ICM_BLOCK_SIZE() which is always a power of 2, we can replace
> > the division with bit operations.
>
> Interesting, we tried to solve it differently.
> I added it to our regression to be on the same side.

This patch works for us.

Thanks,
Reviewed-by: Leon Romanovsky <leonro@...lanox.com>