Linux Virtualization - Jul 2012 - [PATCH 01/15] Drivers: hv: Format GUIDS as per MSFT standards

On Tue, 2012-07-17 at 09:04 -0700, Greg KH wrote:
> On Sat, Jul 14, 2012 at 01:34:06PM -0700, K. Y. Srinivasan wrote:
> > Format GUIDS as per MSFT standard. This makes interacting with MSFT
> > tool stack easier.
[]
> > diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c
[]
> > @@ -147,7 +147,7 @@ static ssize_t vmbus_show_device_attr(struct
device *dev,
> >  
> >  	if (!strcmp(dev_attr->attr.name, "class_id")) {
> >  		ret = sprintf(buf, "{%02x%02x%02x%02x-%02x%02x-%02x%02x-"
> > -			       "%02x%02x%02x%02x%02x%02x%02x%02x}\n",
> > +			       "%02x%02x-%02x%02x%02x%02x%02x%02x}\n",
> 
> As Joe pointed out, please just use the printk modifier the kernel
> already has for GUIDS, and don't roll your own here.  That will work
> properly for you, right?
%pU became available in 2.6.33

I think one of their support targets is RHEL6 which
I believe is 2.6.32+.

On Tue, Jul 17, 2012 at 09:19:26AM -0700, Joe Perches
wrote:
> On Tue, 2012-07-17 at 09:04 -0700, Greg KH wrote:
> > On Sat, Jul 14, 2012 at 01:34:06PM -0700, K. Y. Srinivasan wrote:
> > > Format GUIDS as per MSFT standard. This makes interacting with
MSFT
> > > tool stack easier.
> []
> > > diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c
> []
> > > @@ -147,7 +147,7 @@ static ssize_t vmbus_show_device_attr(struct
device *dev,
> > >  
> > >  	if (!strcmp(dev_attr->attr.name, "class_id")) {
> > >  		ret = sprintf(buf,
"{%02x%02x%02x%02x-%02x%02x-%02x%02x-"
> > > -			       "%02x%02x%02x%02x%02x%02x%02x%02x}\n",
> > > +			       "%02x%02x-%02x%02x%02x%02x%02x%02x}\n",
> > 
> > As Joe pointed out, please just use the printk modifier the kernel
> > already has for GUIDS, and don't roll your own here.  That will
work
> > properly for you, right?
> 
> %pU became available in 2.6.33
> 
> I think one of their support targets is RHEL6 which
> I believe is 2.6.32+.
That's nice, but it's nothing that I care about for in-kernel code, nor
should anyone else.

greg k-h