From: Jonathan Cameron <jic23@kernel.org>
To: Lars-Peter Clausen <lars@metafoo.de>,
Rasmus Villemoes <linux@rasmusvillemoes.dk>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Hartmut Knaack <knaack.h@gmx.de>,
Peter Meerwald <pmeerw@pmeerw.net>,
linux-iio@vger.kernel.org, devel@driverdev.osuosl.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] staging: iio: ad2s1200: Fix sign extension
Date: Mon, 26 Jan 2015 21:05:19 +0000 [thread overview]
Message-ID: <54C6AC0F.8030202@kernel.org> (raw)
In-Reply-To: <54C20CAF.3010901@metafoo.de>
On 23/01/15 08:56, Lars-Peter Clausen wrote:
> On 01/23/2015 12:09 AM, Rasmus Villemoes wrote:
>> The line above makes vel a 12-bit quantity (st->rx[] is u8). The
>> intention is to sign-extend vel using bit 11 as the sign bit. But
>> because of C's promotion rules "vel = (vel << 4) >> 4;" is actually a
>> no-op, since vel is promoted to int before the inner
>> shift. sign_extend32 works equally well for 8 and 16 bits types, so
>> use that.
>>
>> Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk>
>
> Acked-by: Lars-Peter Clausen <lars@metafoo.de>
Applied to fixes-togreg branch of iio.git.
Thanks,
Jonathan
prev parent reply other threads:[~2015-01-26 21:05 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-01-22 23:09 [PATCH] staging: iio: ad2s1200: Fix sign extension Rasmus Villemoes
2015-01-23 8:56 ` Lars-Peter Clausen
2015-01-26 21:05 ` Jonathan Cameron [this message]
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