linux-kernel - Re: READ/WRITE definitions in drivers/spi/spi-omap-100k.c

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Date:	Tue, 29 Oct 2013 14:34:26 +0100
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Tejun Heo <tj@...nel.org>, Mark Brown <broonie@...nel.org>,
	darkstar6262@...il.com
Cc:	Grant Likely <grant.likely@...retlab.ca>,
	Wolfram Sang <w.sang@...gutronix.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	ext Tony Lindgren <tony@...mide.com>
Subject: Re: READ/WRITE definitions in drivers/spi/spi-omap-100k.c

On Thu, Oct 24, 2013 at 2:46 PM, Tejun Heo <tj@...nel.org> wrote:

> Hey, guys.
>
> I was modifying includes in a core header file and got duplicate macro
> definition warnings on READ / WRITE in drivers/spi/spi-omap-100k.c.
> Apparently that driver defines READ / WRITE as macros and assigns the
> opposite values to them from the usual READ / WRITE constants defined
> in include/linux/fs.h.
>
> I just skimmed through it and there doesn't seem to be any user of the
> macros.  Can we *please* remove these?  Please note that READ / WRITE
> defined in include/linux/fs.h is something which is widely used
> throughout the kernel and there are multiple interfaces which take
> those constants.  Re-defining them in the other way around in a driver
> file can lead to subtle issues and just is a bad idea.  In general,
> refraining from using generic symbols without any qualitification in
> low level drivers would be nice.

That seems like a good idea, but we better poke the people who wrote
the code and the SPI maintainer :-)

Yours,
Linus Walleij
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