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Date:   Wed, 13 Jun 2018 20:32:13 +0000
From:   Dexuan Cui <decui@...rosoft.com>
To:     'Bjorn Helgaas' <bhelgaas@...gle.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        'Lorenzo Pieralisi' <lorenzo.pieralisi@....com>,
        "'linux-pci@...r.kernel.org'" <linux-pci@...r.kernel.org>,
        KY Srinivasan <kys@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        "'olaf@...fle.de'" <olaf@...fle.de>,
        "'apw@...onical.com'" <apw@...onical.com>,
        "'jasowang@...hat.com'" <jasowang@...hat.com>
CC:     "'linux-kernel@...r.kernel.org'" <linux-kernel@...r.kernel.org>,
        "'driverdev-devel@...uxdriverproject.org'" 
        <driverdev-devel@...uxdriverproject.org>,
        "'vkuznets@...hat.com'" <vkuznets@...hat.com>,
        "'marcelo.cerri@...onical.com'" <marcelo.cerri@...onical.com>
Subject: RE: [PATCH] PCI: hv: Fix a __local_bh_enable_ip warning in
 hv_compose_msi_msg()

> From: Dexuan Cui
> Sent: Wednesday, June 6, 2018 17:15
> To: Haiyang Zhang <haiyangz@...rosoft.com>; Lorenzo Pieralisi
> <lorenzo.pieralisi@....com>; Bjorn Helgaas <bhelgaas@...gle.com>;
> linux-pci@...r.kernel.org; KY Srinivasan <kys@...rosoft.com>; Stephen
> Hemminger <sthemmin@...rosoft.com>; olaf@...fle.de;
> apw@...onical.com; jasowang@...hat.com
> Cc: linux-kernel@...r.kernel.org; driverdev-devel@...uxdriverproject.org;
> vkuznets@...hat.com; marcelo.cerri@...onical.com
> Subject: RE: [PATCH] PCI: hv: Fix a __local_bh_enable_ip warning in
> hv_compose_msi_msg()
> 
> > From: Haiyang Zhang
> > Sent: Friday, May 25, 2018 12:52
> > To: Dexuan Cui <decui@...rosoft.com>; Lorenzo Pieralisi
> > <lorenzo.pieralisi@....com>; Bjorn Helgaas <bhelgaas@...gle.com>;
> > linux-pci@...r.kernel.org; KY Srinivasan <kys@...rosoft.com>; Stephen
> > Hemminger <sthemmin@...rosoft.com>; olaf@...fle.de;
> > apw@...onical.com; jasowang@...hat.com
> > Cc: linux-kernel@...r.kernel.org; driverdev-devel@...uxdriverproject.org;
> > vkuznets@...hat.com; marcelo.cerri@...onical.com
> > 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@....com>; Bjorn Helgaas
> > > <bhelgaas@...gle.com>; linux-pci@...r.kernel.org; KY Srinivasan
> > > <kys@...rosoft.com>; Stephen Hemminger <sthemmin@...rosoft.com>;
> > > olaf@...fle.de; apw@...onical.com; jasowang@...hat.com
> > > Cc: linux-kernel@...r.kernel.org; driverdev-devel@...uxdriverproject.org;
> > > Haiyang Zhang <haiyangz@...rosoft.com>; vkuznets@...hat.com;
> > > marcelo.cerri@...onical.com
> > > 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@...rosoft.com>
> > > Cc: <stable@...r.kernel.org>
> > > Cc: Stephen Hemminger <sthemmin@...rosoft.com>
> > > Cc: K. Y. Srinivasan <kys@...rosoft.com>
> > > ---
> >
> > Reviewed-by: Haiyang Zhang <haiyangz@...rosoft.com>
> >
> > Thanks you.
> 
> Hi Lorenzo,
> 
> Can I have your reply to this patch?
> 
> -- Dexuan

It looks Lorenzo's pci.git tree has not been updated for 3+ weeks.
I guess Lorenzo may be on vacation. 

@Bjorn, can this patch go through your tree?
Should I resubmit it?

Thanks,
-- Dexuan

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