linux-kernel - Re: [PATCH] drivers/scsi/aic7xxx_old: Convert to generic boolean-values

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Message-Id: <20070216103422.51757e89.akpm@linux-foundation.org>
Date:	Fri, 16 Feb 2007 10:34:22 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	James Bottomley <James.Bottomley@...elEye.com>
Cc:	ricknu-0@...dent.ltu.se, linux-kernel@...r.kernel.org,
	linux-scsi@...r.kernel.org
Subject: Re: [PATCH] drivers/scsi/aic7xxx_old: Convert to generic
 boolean-values

On Fri, 16 Feb 2007 10:42:12 -0600 James Bottomley <James.Bottomley@...elEye.com> wrote:

> On Mon, 2007-02-12 at 12:27 -0800, Andrew Morton wrote:
> > Given that we now have a standard kernel-wide, c99-friendly way of
> > expressing true and false, I'd suggest that this decision can be revisited.
> > 
> > Because a "true" is significantly more meaningful (and hence readable)
> > thing than a bare "1".
> 
> OK, I'm really not happy with doing this for three reasons:
> 
> 1. It's inviting huge amounts of driver churn changing bitfields to
> booleans
> 
> 2. I do find it to be a readability issue.  Like most driver writers,
> I'm used to register layouts, and those are simple bitfields, so I don't
> tend to think true and false, I think 1 and 0.
> 
> 3. Having a different, special, type for single bit bitfields (while
> still using u<n> for multi bit bitfields) is asking for confusion, and
> hence trouble at the driver level.
> 

Confused.  The patch changes TRUE to true and FALSE to false.  The code
wasn't using bitfields before and isn't using them afterwards.  I wouldn't
expect there to be any change in generated code.

All it's doing is replacing the driver's private TRUE/FALSE with the
kernel-wide ones.
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