linux-kernel - Re: [PATCH] Intel Manageability Engine Interface driver

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Date:	Tue, 23 Oct 2007 09:32:16 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	lsorense@...lub.uwaterloo.ca (Lennart Sorensen)
Cc:	Anas Nashif <nashif@...ux.intel.com>, linux-kernel@...r.kernel.org,
	Marek Dabek <marek.dabek@...el.com>
Subject: Re: [PATCH] Intel Manageability Engine Interface driver

On Tue, 23 Oct 2007 11:04:29 -0400 lsorense@...lub.uwaterloo.ca (Lennart Sorensen) wrote:

> On Mon, Oct 22, 2007 at 11:40:01AM -0700, Andrew Morton wrote:
> > - Here:
> > 
> > +		if (0 == memcmp(&heci_wd_guid,
> > 
> >   we boringly prefer "if (foo == 0)" rather than "if (0 == foo)".  (lots
> >   of places).
> 
> But 0 == blah is safer.  If you accidentally do 0 = blah the compiler
> will tell you.

If you do 'if (blah = 0)' then compiler will tell you too.  To all intents
and purposes this invalidates the reasons for doing `if (0 == blah)'.

>  Just because people have always done it the other way
> around doesn't make it the right way to do it.  I have noticed many
> people have started to realize this in the last few years.
> 
> It is also much clearer that you are comparing against a constant and
> not doing an assignment when the constant comes before the variable.
> 
> I think to encourage people doing it the less safe way is just silly.

It isn't less safe.

> Some places in the kernel that already uses the constant first are:

It impacts readability.  All the aio code was implemented that way for a
few years and it drove everyone so batty that we undid it.
-
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