linux-kernel - Re: [PATCH 04/13] PCI: acpiphp: remove 'name' parameter

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Date:	Tue, 19 Aug 2008 17:50:26 -0600
From:	Alex Chiang <achiang@...com>
To:	Jesse Barnes <jbarnes@...tuousgeek.org>
Cc:	Rolf Eike Beer <eike-kernel@...tec.de>,
	linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
	kristen.c.accardi@...el.com, kaneshige.kenji@...fujitsu.com
Subject: Re: [PATCH 04/13] PCI: acpiphp: remove 'name' parameter

* Jesse Barnes <jbarnes@...tuousgeek.org>:
> On Tuesday, August 19, 2008 11:39 am Alex Chiang wrote:
> > * Rolf Eike Beer <eike-kernel@...tec.de>:
> > > Alex Chiang wrote:
> > > > +static inline const char *slot_name(struct slot *slot)
> > > > +{
> > > > +	return hotplug_slot_name(slot->hotplug_slot);
> > > > +}
> > > > +
> > > >  /*
> > > >   * struct acpiphp_bridge - PCI bridge information
> > > >   *
> > >
> > > I don't see a point in this function. Why not call hotplug_slot_name()
> > > directly?
> >
> > You're correct that we don't exactly need it in acpiphp. However,
> > it is a useful helper function for some of the other drivers, and
> > I thought it would be better to keep consistency if possible.
> >
> > Also, it helps later on, when trying to stay below the 80 column
> > limit. :)
> 
> If they're all identical, maybe we should pull this up into a
> common function (with a short name :).  That can be a
> subsequent cleanup though.

Ok, I'll save this for next time. Or someone else can have the
git glory. ;)

> > > > @@ -84,7 +87,6 @@ static struct hotplug_slot_ops acpi_hotplug_slot_ops
> > > > = { .get_adapter_status	= get_adapter_status,
> > > >  };
> > > >
> > > > -
> > > >  /**
> > > >   * acpiphp_register_attention - set attention LED callback
> > > >   * @info: must be completely filled with LED callbacks
> > >
> > > Fuzz.
> >
> > Yes, it's fuzz, but my practice has been to clean up* source files
> > during the course of making actual, functional changes. Better
> > than sending a mostly-useless whitespace patchbomb, IMO.
> >
> > * Note that "clean up" here means "reasonable cleanup" that
> >   doesn't detract from reading the rest of the patch.
> 
> Yeah the main reason for separating whitespace changes from
> real ones is to avoid making the patch hard to read in case a
> problem crops up.  Killing an extra newline doesn't make things
> harder to read, imo, so it's fine with me if you keep it
> (though if you *do* end up doing a cleanup patch later you
> could save it for that).

I'll keep the 'kill the newline' here but drop the kerneldoc
stuff. As you point out, kerneldoc will take either */ or **/.

> > > >  	acpiphp_slot->slot = slot;
> > > > -	snprintf(slot->name, sizeof(slot->name), "%u", slot->acpi_slot->sun);
> > > > +	memset(name, 0, SLOT_NAME_SIZE);
> > > > +	snprintf(name, SLOT_NAME_SIZE, "%u", slot->acpi_slot->sun);
> > >
> > > The memset() is not needed at all. And the sizeof is IMHO a good idea
> > > anyway as it allows to get rid of the define.
> >
> > Hm, don't need a memset? I won't have garbage on the stack?
> > </n00b>
> 
> Yeah, but you'll overwrite it with snprintf anyway, so the memset is 
> redundant.

Ok. I went through and removed the superfluous memsets, and
changed instances of snprintf() to scnprintf().

> > On the other hand, keeping the #define is important, because
> > again, that's the established convention of the PCI hotplug
> > drivers.
> >
> > Thanks for the review.
> 
> Going from the define to sizeof() everywhere could be another
> cleanup, but I don't have strong feelings about that.

Ok, saving these for next time too.

I'll hold off from sending v2 until I hear comments from
Kenji-san, so if he has any suggestions, I can incorporate them
all in v2.

Thanks.

/ac

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