From: Dan Carpenter <dan.carpenter@oracle.com>
To: Ian Abbott <abbotti@mev.co.uk>
Cc: Ranjith Thangavel <ranjithece24@gmail.com>,
gregkh@linuxfoundation.org, devel@driverdev.osuosl.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] comedi: dmm32at: Fix coding style - use BIT macro
Date: Thu, 19 Nov 2015 10:51:32 +0300 [thread overview]
Message-ID: <20151119075132.GT18797@mwanda> (raw)
In-Reply-To: <564CA6CC.6010600@mev.co.uk>
On Wed, Nov 18, 2015 at 04:26:52PM +0000, Ian Abbott wrote:
> >+#define DMM32AT_AI_CFG_SCINT_10US (BIT(5) & ~BIT(4))
> >+#define DMM32AT_AI_CFG_SCINT_5US (BIT(5) | BIT(4))
>
> The values of DMM32AT_AI_CFG_SCINT_20US etc. are numerically
> correct, but look a bit strange. The `(BIT(5) & ~BIT(4))` looks
> especially strange and could be changed to `BIT(5)`. These are all
> really shifted 2-bit values, so perhaps the BIT() macro isn't the
> best representation.
>
BIT(5) & ~BIT(4) is silly. Don't do that.
The original code was fine.
regards,
dan carpenter
next prev parent reply other threads:[~2015-11-19 7:51 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-11-14 17:10 [PATCH] comedi: dmm32at: Fix coding style - use BIT macro Ranjith Thangavel
2015-11-16 14:43 ` Dan Carpenter
2015-11-18 16:26 ` Ian Abbott
2015-11-18 16:34 ` Ian Abbott
2015-11-19 7:51 ` Dan Carpenter [this message]
-- strict thread matches above, loose matches on Subject: below --
2015-11-16 17:09 Ranjith Thangavel
2015-11-16 17:21 ` Hartley Sweeten
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