linux-kernel - Re: [PATCH] mtd: clean up whitespace in linux/mtd/map.h

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Date:	Tue, 10 Mar 2015 12:58:32 -0700
From:	Brian Norris <computersforpeace@...il.com>
To:	Joe Perches <joe@...ches.com>
Cc:	Arnd Bergmann <arnd@...db.de>,
	David Woodhouse <dwmw2@...radead.org>,
	Jingoo Han <jg1.han@...sung.com>,
	linux-mtd@...ts.infradead.org,
	Ezequiel Garcia <ezequiel@...guardiasur.com.ar>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mtd: clean up whitespace in linux/mtd/map.h

On Tue, Mar 10, 2015 at 11:33:36AM -0700, Joe Perches wrote:
> On Tue, 2015-03-10 at 17:51 +0100, Arnd Bergmann wrote:
> > As the only comments I got for the "mtd: cfi: reduce stack size"
> > patch were about whitespace changes, it appears necessary to fix
> > up the rest of the file as well, which contains the exact same
> > mistakes.
> 
> trivia:
> 
> > diff --git a/include/linux/mtd/map.h b/include/linux/mtd/map.h
> []
> > @@ -77,7 +77,7 @@
> >  /* ensure we never evaluate anything shorted than an unsigned long
> >   * to zero, and ensure we'll never miss the end of an comparison (bjd) */
> >  
> > -#define map_calc_words(map) ((map_bankwidth(map) + (sizeof(unsigned long)-1))/ sizeof(unsigned long))
> > +#define map_calc_words(map) ((map_bankwidth(map) + (sizeof(unsigned long)-1)) / sizeof(unsigned long))
> 
> DIV_ROUND_UP?
>  
> >  #ifdef CONFIG_MTD_MAP_BANK_WIDTH_8
> >  # ifdef map_bankwidth
> > @@ -181,7 +181,7 @@ static inline int map_bankwidth_supported(int w)
> >  	}
> >  }
> >  
> > -#define MAX_MAP_LONGS ( ((MAX_MAP_BANKWIDTH*8) + BITS_PER_LONG - 1) / BITS_PER_LONG )
> > +#define MAX_MAP_LONGS (((MAX_MAP_BANKWIDTH * 8) + BITS_PER_LONG - 1) / BITS_PER_LONG)
> 
> BITS_TO_LONGS?

It seems the $subject patch is really not that necessary, as it was just
inspired by similarly trivial comments. But I thought CodingStyle
was supposed to mostly be a guide for new code, not a charter to "fix
up" old code like drivers/mtd/{chips,maps}.

So I would have been happy with ignoring the whitespace comments on the
v1 stack usage patch (esp. since it *did* match the existing style), and
avoiding the ensuing comments about helper macros. IMO, it's pretty
silly when a simple patch to fix a real issue turns into an extended
search for other trivial issues.

I'll probably take both of Arnd's patches as they stand, but any more
trivial requests to stable code like this should come in the form of
real patches, not respins of Arnd's patch.

Disclaimer: I'm probably just as guilty of adding trivial tangential
comments/requests that distract from the original issue. So I'm partly
speaking to myself here.

Happy coding,
Brian
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