linux-kernel - Re: [PATCH 1/1] spi: Remove unused definitions

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Message-ID: <17153.1407349640@turing-police.cc.vt.edu>
Date:	Wed, 06 Aug 2014 14:27:20 -0400
From:	Valdis.Kletnieks@...edu
To:	Nick Krause <xerofoiffy@...il.com>
Cc:	Richard Weinberger <richard.weinberger@...il.com>,
	Mark Brown <broonie@...nel.org>,
	linux-spi@...r.kernel.org (open list:SPI SUBSYSTEM),
	linux-kernel@...r.kernel.org (open list)
Subject: Re: [PATCH 1/1] spi: Remove unused definitions

On Wed, 06 Aug 2014 13:53:17 -0400, Nick Krause said:
> Remove unused definition which cause the following warnings
> 
> drivers/spi/spi-omap-100k.c:73:0: warning: "WRITE" redefined [enabled by default]
> include/linux/fs.h:193:0: note: this is the location of the previous definition
> drivers/spi/spi-omap-100k.c:74:0: warning: "READ" redefined [enabled by default]
> include/linux/fs.h:192:0: note: this is the location of the previous definition

> -#define WRITE 0
> -#define READ  1

NAK.  Full stop.  These are potentially used in an inner macro someplace, and by
removing these, the conflicting values from fs.h will be used instead.

#define READ                    0
#define WRITE                   RW_MASK

So if there *is* a use in an inner macro, you just screwed the pooch
and introduced a bug in this "clean up" - somebody will be expecting to see
a 0 for a READ, and will receive a 1 instead.  This can't end well.

Nick - how *exactly* did you identify that these are in fact not used?
Given your history of submitting poorly researched patches, you're going to
have to justify the "unused" better than the handwaving you've done here.

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