Re: [EXTERNAL] Re: Please cherry-pick this commit to v5.15.y, 5.10.y and 5.4.y: 23e118a48acf ("PCI: hv: Do not set PCI_COMMAND_MEMORY to reduce VM boot time")

[Greg KH <gregkh@linuxfoundation.org>]

On Thu, Jul 03, 2025 at 01:15:47AM +0000, Dexuan Cui wrote:
> 
> > From: Greg KH <gregkh@linuxfoundation.org>
> > Sent: Wednesday, July 2, 2025 1:08 AM
> > To: Dexuan Cui <decui@microsoft.com>
> > Cc: Stable <stable@vger.kernel.org>; Long Li <longli@microsoft.com>
> > Subject: [EXTERNAL] Re: Please cherry-pick this commit to v5.15.y, 5.10.y and
> > 5.4.y: 23e118a48acf ("PCI: hv: Do not set PCI_COMMAND_MEMORY to
> > reduce VM boot time")
> > 
> > On Wed, Jun 25, 2025 at 06:05:26AM +0000, Dexuan Cui wrote:
> > > Hi,
> > > The commit has been in v6.1.y for 3+ years (but not in the 5.x stable
> > > branches):
> > >         23e118a48acf ("PCI: hv: Do not set PCI_COMMAND_MEMORY to
> > > reduce VM boot time")
> > >
> > > The commit can be cherry-picked cleanly to the latest 5.x stable branches,
> > > i.e. 5.15.185, 5.10.238 and 5.4.294.
> > 
> > It adds a new build warning on 5.4.y, so I will not apply it there,
> > sorry.  Will go apply it to 5.10.y and 5.15.y for now.
> 
> Out of curiosity, I built 5.4.y plus the commit and got this warning:
> 
> drivers/pci/controller//pci-hyperv.c: In function 'prepopulate_bars':
> drivers/pci/controller//pci-hyperv.c:1731:13: warning: unused variable 'command' [-Wunused-variable]
> 
> I think 5.4.y lacks another commit made in 2019:
> ac82fc832708 ("PCI: hv: Add hibernation support")
> but definitely we don't want to pull this commit into 5.4.y.
> 
> > thanks,
> > 
> > greg k-h
> 
> I guess this requested commit doesn't really need to go into 5.4.y,
> which I suppose isn't used widely any more. I listed it just for
> completeness :-)

If you really want it in 5.4.y, please provide a version that doesn't
add the warning :)