Re: RFC: turn kmalloc+memset(,0,) into kcalloc

[Jesper Juhl <juhl-lkml@dif.dk>]

On Wed, 6 Apr 2005, Jörn Engel wrote:

> On Tue, 5 April 2005 22:01:49 +0200, Jesper Juhl wrote:
> > On Tue, 5 Apr 2005, Roland Dreier wrote:
> > 
> > >     > or simply
> > >     > 	if (!(ptr = kcalloc(n, size, ...)))
> > >     > 		goto out;
> > >     > and save an additional line of screen realestate while you are at it...
> > > 
> > > No, please don't do that.  The general kernel style is to avoid
> > > assignments within conditionals.
> > > 
> > It may be the prefered style to avoid assignments in conditionals, but in 
> > that case we have a lot of cleanup to do. What I wrote above is quite 
> > common in the current tree - a simple  egrep -r "if\ *\(\!\(.+=" *  in 
> > 2.6.12-rc2-mm1 will find you somewhere between 1000 and 2000 cases 
> > scattered all over the tree.
> > 
> > Personally I don't see why thy should not be used. They are short, not any 
> > harder to read (IMHO), save screen space & are quite common in userspace 
> > code as well (so people should be used to seeing them).
> > 
> > If such statements are generally frawned upon then I'd suggest an addition 
> > be made to Documentation/CodingStyle mentioning that fact, and I wonder if 
> > patches to clean up current users would be welcome?
> 
> I _do_ change them whenever they occur in code I maintain.  And each
> time, it is an improvement.
> 
> o Functional code always has the same indentation.  I can mentally
>   ignore the error path by ignoring all indented code.  Getting a
>   quick overview is quite nice.
> 
> o Rather often, your preferred variant violates the 80 columns rule.
>   If I need the line break anyway,...
> 
> o Keeping condition and functional code seperate avoids the Lisp-style
>   bracket maze.  Some editors can help you here, but not needing any
>   help would be even better, no?
> 
Ok, I accept those arguments, they make sense. I may still have a personal 
preference that differ slightly, but I see your point(s).

-- 
Jesper

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