Re: [PATCH 3.12-rc7] KVM: Fix modprobe failure for kvm_intel/kvm_amd

Greg KH
2013-10-30T15:59:33Z

On Wed, Oct 30, 2013 at 04:46:28PM +0100, Paolo Bonzini wrote:
> Il 30/10/2013 16:39, Raghavendra K T ha scritto:
> >>
> >> Why even error out at all here? You should never care about debugfs
> >> file creation return values, so why pass any error back up the stack?
> >
> > We could change this to return 0, but we will still be left with
> > kvm_main.c: kvm_init_debug() function which creates the kvm debugfs
> > directory. (I thought Paolo and Gleb's ack would be needed for
> > that change since it would be a bigger decision for me)
> >
> > So I just made the patch to fix only Linus's concern.
>
> Even if it is okay to exit and not create the files (and I think it's a
> bit surprising), I'd like at least a printk to signal what's happening.
> But there should be no reason for debugfs directory creation to fail in
> the end, except for basic mistakes such as the one that Tim reported, so
> I think it's better to report the failure.

Creation will "fail" if debugfs is not enabled, so spiting out printk
messages in that case is not a good idea.

greg k-h