linux-kernel - Re: [PATCH v5 3/3] misc/pvpanic: add PCI driver

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Date:   Tue, 16 Mar 2021 19:16:14 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Mihai Carabas <mihai.carabas@...cle.com>
Cc:     linux-kernel@...r.kernel.org, arnd@...db.de,
        bobo.shaobowang@...wei.com, rdunlap@...radead.org
Subject: Re: [PATCH v5 3/3] misc/pvpanic: add PCI driver

On Tue, Mar 16, 2021 at 08:02:14PM +0200, Mihai Carabas wrote:
> La 16.03.2021 19:29, Greg KH a scris:
> > On Tue, Mar 16, 2021 at 07:08:38PM +0200, Mihai Carabas wrote:
> > > ..snip..
> > > > > +};
> > > > > +static unsigned int capability = PVPANIC_PANICKED | PVPANIC_CRASH_LOADED;
> > > > > +static unsigned int events;
> > > > > +
> > > > > +static ssize_t capability_show(struct device *dev,
> > > > > +			       struct device_attribute *attr, char *buf)
> > > > > +{
> > > > > +	return sysfs_emit(buf, "%x\n", capability);
> > > > A global capability for all devices?  No, this needs to be a per-device
> > > > attttribute as you are showing it to userspace as such.
> > > We can only have a pvpanic-pci device. This is necessary in that case?
> > Why would it not be?  Why constrain yourself to something that someone
> > will only have to fix sometime in the future?
> 
> Agree. But why this got in in Jan2021 for pvpanic-mmio.c (ex. pvpanic.c)
> like this :)?
> 

Because I didn't object strong enough :)