netdev - Re: [PATCH RFC v2] mac80211: debugfs option to force TX status frames

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Message-Id: <D78A58DC-E38B-4BD8-9D11-A873FFE16602@gmx.net>
Date:   Tue, 19 Mar 2019 16:07:32 +0100
From:   Julius Niedworok <julius.n@....net>
To:     Jeremy Sowden <jeremy@...zel.net>
Cc:     Kalle Valo <kvalo@...eaurora.org>, ga58taw@...um.de,
        linux-wireless@...r.kernel.org, david@...hat.com, nc@....in.tum.de,
        Johannes Berg <johannes@...solutions.net>,
        "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH RFC v2] mac80211: debugfs option to force TX status frames


> On 11.03.2019 15:52, Jeremy Sowden wrote:
>
> It's the value that matters, not the type.  It will only be too big for
> the buffer if the result of casting local->force_tx_status to int is
> less than -9 or greeater than 99.
>
>  scnprintf(buf, size(buf), "%lld\n", (long long)local->force_tx_status)
>
> would also be fine if the value were in range.  Note also that scnprintf
> will not overrun the buffer: it will truncate the string.

Thanks for the clarification :)

> As it happens, arguments to variadic functions are subject to the
> "default argument promotions," so if local->force_tx_status is in fact a
> bool (I can't find the definition), it would be promoted to int and the
> cast is superfluous.

Yes - the cast is superfluous. We still think it might be useful to keep it
there to make the point that the value will be casted. However, if you
prefer to omit the cast, we are happy to take it out.


Thank you,
Julius and Charlie