linux-kernel - Re: [PATCH] wifi: rt2x00: use explicitly signed type for clamping

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Date:   Wed, 19 Oct 2022 10:52:19 +0200
From:   Stanislaw Gruszka <stf_xl@...pl>
To:     "Jason A. Donenfeld" <Jason@...c4.com>
Cc:     linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Helmut Schaa <helmut.schaa@...glemail.com>,
        Kalle Valo <kvalo@...nel.org>
Subject: Re: [PATCH] wifi: rt2x00: use explicitly signed type for clamping

On Tue, Oct 18, 2022 at 02:27:34PM -0600, Jason A. Donenfeld wrote:
> On some platforms, `char` is unsigned, which makes casting -7 to char
> overflow, which in turn makes the clamping operation bogus. Instead,
> deal with an explicit `s8` type, so that the comparison is always
> signed, and return an s8 result from the function as well. Note that
> this function's result is assigned to a `short`, which is always signed.
> 
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Cc: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> Cc: Stanislaw Gruszka <stf_xl@...pl>
> Cc: Helmut Schaa <helmut.schaa@...glemail.com>
> Cc: Kalle Valo <kvalo@...nel.org>
> Signed-off-by: Jason A. Donenfeld <Jason@...c4.com>

I prefer s8 just because is shorter name than short :-)

Acked-by: Stanislaw Gruszka <stf_xl@...pl>