linux-kernel - Re: [PATCH 7/7] ixgbevf: eliminate duplicate barriers on weakly-ordered archs

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Message-ID: <2a4f4dec64b7462ae64152f6c2df9754@codeaurora.org>
Date:   Wed, 14 Mar 2018 08:13:05 -0400
From:   okaya@...eaurora.org
To:     Timur Tabi <timur@...eaurora.org>
Cc:     netdev@...r.kernel.org, sulrich@...eaurora.org,
        linux-arm-msm@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
        intel-wired-lan@...ts.osuosl.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 7/7] ixgbevf: eliminate duplicate barriers on
 weakly-ordered archs

On 2018-03-14 01:08, Timur Tabi wrote:
> On 3/13/18 10:20 PM, Sinan Kaya wrote:
>> +/* Assumes caller has executed a write barrier to order memory and 
>> device
>> + * requests.
>> + */
>>   static inline void ixgbevf_write_tail(struct ixgbevf_ring *ring, u32 
>> value)
>>   {
>> -	writel(value, ring->tail);
>> +	writel_relaxed(value, ring->tail);
>>   }
> 
> Why not put the wmb() in this function, or just get rid of the wmb()
> in the rest of the file and keep this as writel?  That way, you can
> avoid the comment and the risk that comes with it.


Sure, both solutions will work. I want to see what the maintainer 
prefers. I can repost accordingly.