linux-kernel - Re: [PATCH 1/6] relay: allow the use of const callback structs

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Date:   Mon, 23 Nov 2020 20:01:17 +0200
From:   Jani Nikula <jani.nikula@...el.com>
To:     Christoph Hellwig <hch@...radead.org>
Cc:     linux-kernel@...r.kernel.org, intel-gfx@...ts.freedesktop.org,
        linux-block@...r.kernel.org, Jens Axboe <axboe@...nel.dk>,
        ath11k@...ts.infradead.org, ath10k@...ts.infradead.org,
        Kalle Valo <kvalo@...eaurora.org>,
        linux-wireless@...r.kernel.org,
        QCA ath9k Development <ath9k-devel@....qualcomm.com>
Subject: Re: [PATCH 1/6] relay: allow the use of const callback structs

On Thu, 19 Nov 2020, Christoph Hellwig <hch@...radead.org> wrote:
> But taking one step back:  All instances implement create_buf_file
> and remove_buf_file, which makes sense as that is the prime aim
> of these methods.  So there is no point in making those optional.
> subbuf_start_callback is overriden by two instances, so making that
> optional totally makes sense.  buf_mapped and buf_unmapped are
> never overriden, so they should be removed entirely.
>
> More importantly there is no case that passes a NULL rchan_callbacks,
> which makes complete sense as it wouldn't even create a file.  So
> remove that case as well and just replace it with a sanity check in
> relay_open().

Many thanks for the feedback; sent v2 [1].

BR,
Jani.


[1] http://lore.kernel.org/r/cover.1606153547.git.jani.nikula@intel.com


-- 
Jani Nikula, Intel Open Source Graphics Center