Re: [PATCH] drivers/scsi/aic7xxx_old: Convert to genericboolean-values

From: Andrew Morton
Date: Fri Feb 16 2007 - 13:34:54 EST

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