RE: [PATCH] PCI: hv: Fix a __local_bh_enable_ip warning in hv_compose_msi_msg()

[Dexuan Cui]

> From: Haiyang Zhang
> Sent: Friday, May 25, 2018 12:52
> To: Dexuan Cui <decui@xxxxxxxxxxxxx>; Lorenzo Pieralisi
> <lorenzo.pieralisi@xxxxxxx>; Bjorn Helgaas <bhelgaas@xxxxxxxxxx>;
> linux-pci@xxxxxxxxxxxxxxx; KY Srinivasan <kys@xxxxxxxxxxxxx>; Stephen
> Hemminger <sthemmin@xxxxxxxxxxxxx>; olaf@xxxxxxxxx;
> apw@xxxxxxxxxxxxx; jasowang@xxxxxxxxxx
> Cc: linux-kernel@xxxxxxxxxxxxxxx; driverdev-devel@xxxxxxxxxxxxxxxxxxxxxx;
> vkuznets@xxxxxxxxxx; marcelo.cerri@xxxxxxxxxxxxx
> Subject: RE: [PATCH] PCI: hv: Fix a __local_bh_enable_ip warning in
> hv_compose_msi_msg()
> 
> > From: Dexuan Cui
> > Sent: Tuesday, May 22, 2018 8:18 PM
> > To: Lorenzo Pieralisi <lorenzo.pieralisi@xxxxxxx>; Bjorn Helgaas
> > <bhelgaas@xxxxxxxxxx>; linux-pci@xxxxxxxxxxxxxxx; KY Srinivasan
> > <kys@xxxxxxxxxxxxx>; Stephen Hemminger <sthemmin@xxxxxxxxxxxxx>;
> > olaf@xxxxxxxxx; apw@xxxxxxxxxxxxx; jasowang@xxxxxxxxxx
> > Cc: linux-kernel@xxxxxxxxxxxxxxx; driverdev-devel@xxxxxxxxxxxxxxxxxxxxxx;
> > Haiyang Zhang <haiyangz@xxxxxxxxxxxxx>; vkuznets@xxxxxxxxxx;
> > marcelo.cerri@xxxxxxxxxxxxx
> > Subject: [PATCH] PCI: hv: Fix a __local_bh_enable_ip warning in
> > hv_compose_msi_msg()
> >
> >
> > Commit de0aa7b2f97d ("PCI: hv: Fix 2 hang issues in
> hv_compose_msi_msg()")
> > uses local_bh_disable()/enable(), because hv_pci_onchannelcallback() can
> also
> > run in tasklet context as the channel event callback.
> >
> > With CONFIG_PROVE_LOCKING=y in the latest mainline, or old kernels that
> > don't have commit f71b74bca637 ("irq/softirqs: Use lockdep to assert IRQs
> are
> > disabled/enabled"), it turns out can we trigger a warning at the beginning of
> > __local_bh_enable_ip(), because the upper layer irq code can call
> > hv_compose_msi_msg() with local irqs disabled.
> >
> > Let's fix the warning by switching to local_irq_save()/restore(). This is not an
> > issue because hv_pci_onchannelcallback() is not slow, and it not a hot path.
> >
> > Fixes: de0aa7b2f97d ("PCI: hv: Fix 2 hang issues in hv_compose_msi_msg()")
> > Signed-off-by: Dexuan Cui <decui@xxxxxxxxxxxxx>
> > Cc: <stable@xxxxxxxxxxxxxxx>
> > Cc: Stephen Hemminger <sthemmin@xxxxxxxxxxxxx>
> > Cc: K. Y. Srinivasan <kys@xxxxxxxxxxxxx>
> > ---
> 
> Reviewed-by: Haiyang Zhang <haiyangz@xxxxxxxxxxxxx>
> 
> Thanks you.

Hi Lorenzo,

Can I have your reply to this patch?

-- Dexuan