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

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Message-ID: <20190529160800.GA6680@ziepe.ca>
Date:   Wed, 29 May 2019 13:08:00 -0300
From:   Jason Gunthorpe <jgg@...pe.ca>
To:     Michal Kubecek <mkubecek@...e.cz>
Cc:     Leon Romanovsky <leon@...nel.org>,
        Doug Ledford <dledford@...hat.com>,
        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 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.
> 
> Fixes: 25c13324d03d ("IB/mlx5: Add steering SW ICM device memory type")
> Signed-off-by: Michal Kubecek <mkubecek@...e.cz>
> Reviewed-by: Leon Romanovsky <leonro@...lanox.com>
> ---
>  drivers/infiniband/hw/mlx5/cmd.c  | 9 +++++++--
>  drivers/infiniband/hw/mlx5/main.c | 2 +-
>  2 files changed, 8 insertions(+), 3 deletions(-)

Applied to for-rc, thanks

Jason