netdev - Re: [PATCH mlx5-next 4/4] net/mlx5: Remove spinlock support from mlx5

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Message-ID: <20190121164551.GF25149@mellanox.com>
Date:   Mon, 21 Jan 2019 16:45:58 +0000
From:   Jason Gunthorpe <jgg@...lanox.com>
To:     Leon Romanovsky <leonro@...lanox.com>
CC:     Saeed Mahameed <saeedm@...lanox.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
        Maxim Mikityanskiy <maximmi@...lanox.com>,
        Eran Ben Elisha <eranbe@...lanox.com>
Subject: Re: [PATCH mlx5-next 4/4] net/mlx5: Remove spinlock support from
 mlx5_write64

On Sat, Jan 19, 2019 at 12:43:14AM -0700, Leon Romanovsky wrote:
> You need to do one of two things:
> 1. Require CONFIG_64BIT and delete this 32bit code.
> 2. Declare global mlx5 DB spinlock and use on 32bit systems, something
> like this:
> #if BITS_PER_LONG == 64
>  __raw_writeq(*(u64 *)val, dest);
> #else
>   spin_lock_irqsave(doorbell_lock, flags);
>   __raw_writel((__force u32) val[0], dest);
>   __raw_writel((__force u32) val[1], dest + 4);
>    spin_unlock_irqrestore(doorbell_lock, flags);
> #endif

And why is this code using the __raw_ versions? Seems wrong too...

Jason