linux-kernel - Re: [PATCH v6 4/5] dmaengine: idxd: Clean up descriptors with fault error

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Message-ID: <20201005054552.GN2968@vkoul-mobl>
Date:   Mon, 5 Oct 2020 11:15:52 +0530
From:   Vinod Koul <vkoul@...nel.org>
To:     Dave Jiang <dave.jiang@...el.com>
Cc:     tglx@...utronix.de, mingo@...hat.com, bp@...en8.de,
        dan.j.williams@...el.com, tony.luck@...el.com, jing.lin@...el.com,
        ashok.raj@...el.com, sanjay.k.kumar@...el.com,
        fenghua.yu@...el.com, kevin.tian@...el.com,
        David.Laight@...lab.com, dmaengine@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6 4/5] dmaengine: idxd: Clean up descriptors with fault
 error

On 04-10-20, 21:55, Dave Jiang wrote:
> > > +static bool process_fault(struct idxd_desc *desc, u64 fault_addr)
> > > +{
> > > +	if ((u64)desc->hw == fault_addr ||
> > > +	    (u64)desc->completion == fault_addr) {
> > 
> > you are casting descriptor address and completion, I can understand
> > former, but later..? Can you explain this please
> > 
> 
> It is possible to fail on the completion writeback address if the completion
> address programmed into the descriptor is bad.

Okay thanks for clarifying, maybe would help to add a comment.

-- 
~Vinod