Re: [PATCH] CCISS: Don't print driver version until we actually find a device

From: gmu 2k6
Date: Thu Jul 27 2006 - 09:28:16 EST

On 7/27/06, Dmitry Torokhov <dmitry.torokhov@xxxxxxxxx> wrote:
On 7/26/06, Jeff Garzik <jeff@xxxxxxxxxx> wrote:
> Arjan van de Ven wrote:
> > On Wed, 2006-07-26 at 00:43 +0200, Jesper Juhl wrote:
> >> On 26/07/06, Bjorn Helgaas <bjorn.helgaas@xxxxxx> wrote:
> >>> If we don't find any devices, we shouldn't print anything.
> >>>
> >> I disagree.
> >> I find it quite nice to be able to see that the driver loaded even if
> >> it finds nothing. At least then when there's a problem, I can quickly
> >> see that at least it is not because I didn't forget to load the
> >> driver, it's something else. Saves time since I can start looking for
> >> reasons why the driver didn't find anything without first spending
> >> additional time checking if I failed to cause it to load for some
> >> reason.
> >
> > I'll add a second reason: it is a REALLY nice property to be able to see
> > which driver is started last in case of a crash/hang, so that the guilty
> > party is more obvious..
> OTOH, it is not a property that scales well at all.
> When you build extra drivers into the kernel, or distros load drivers
> you don't need (_every_ distro does this), you wind up with a bunch of
> version strings for drivers for hardware you don't have.

Given that boot tracing is best done with initcall_debug and
drivers that care about their version string can report it through
/sys/modules/<driver>/version why should version string be printed at
load time at all?

not every driver provides that file (btw, I guess you mean
/sys/module, don't you?) there anyway so it's still inconsistent.
what if you can see up until loading of the driver and it halts there
without /sys being mounted yet. I don't think you can rely on sysfs
being mounted or modules being loaded.
if I may vote as a CCISS user I say print the version number even if
no device is present.
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