Jiang Liu wrote on 08/09/15 14:49:
Hi Auhur,
Could you please help to apply the test patch
against the latest mainstream linux kernel?
Thanks!
Gerry
...
git bisect good
991de2e59090e55c65a7f59a049142e3c480f7bd is the first bad commit
commit 991de2e59090e55c65a7f59a049142e3c480f7bd
Author: Jiang Liu <jiang.liu@xxxxxxxxxxxxxxx>
Date: Wed Jun 10 16:54:59 2015 +0800
PCI, x86: Implement pcibios_alloc_irq() and pcibios_free_irq()
To support IOAPIC hotplug, we need to allocate PCI IRQ resources on
demand
and free them when not used anymore.
Implement pcibios_alloc_irq() and pcibios_free_irq() to dynamically
allocate and free PCI IRQs.
Remove mp_should_keep_irq(), which is no longer used.
[bhelgaas: changelog]
Signed-off-by: Jiang Liu <jiang.liu@xxxxxxxxxxxxxxx>
Signed-off-by: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
Acked-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
:040000 040000 765e2d5232d53247ec260b34b51589c3bccb36ae
f680234a27685e94b1a35ae2a7218f8eafa9071a M arch
:040000 040000 d55a682bcde72682e883365e88ad1df6186fd54d
f82c470a04a6845fcf5e0aa934512c75628f798d M drivers
I tried to do a kexec shut-down with the first version of your patch:
>From 3085626fb2e677c1d88f158397948935b73f5239 Mon Sep 17 00:00:00 2001
From: Jiang Liu <jiang.liu@xxxxxxxxxxxxxxx>
Date: Tue, 8 Sep 2015 10:41:19 +0800
Subject: [PATCH]
Signed-off-by: Jiang Liu <jiang.liu@xxxxxxxxxxxxxxx>
---
drivers/pci/pci-driver.c | 1 +
drivers/scsi/eata.c | 2 ++
2 files changed, 3 insertions(+)
diff --git a/drivers/pci/pci-driver.c b/drivers/pci/pci-driver.c
index 52a880ca1768..17d2a0b1de18 100644
--- a/drivers/pci/pci-driver.c
+++ b/drivers/pci/pci-driver.c
@@ -392,6 +392,7 @@ int __weak pcibios_alloc_irq(struct pci_dev *dev)
{
return 0;
}
+EXPORT_SYMBOL_GPL(pcibios_alloc_irq);
void __weak pcibios_free_irq(struct pci_dev *dev)
{
diff --git a/drivers/scsi/eata.c b/drivers/scsi/eata.c
index 227dd2c2ec2f..7e6eaf867987 100644
--- a/drivers/scsi/eata.c
+++ b/drivers/scsi/eata.c
@@ -1061,6 +1061,7 @@ static void enable_pci_ports(void)
driver_name, dev->bus->number, dev->devfn);
#endif
+ pcibios_alloc_irq(dev);
if (pci_enable_device(dev))
printk
("%s: warning, pci_enable_device failed, bus %d devfn 0x%x.\n",
@@ -1520,6 +1521,7 @@ static void add_pci_ports(void)
if (!(dev = pci_get_class(PCI_CLASS_STORAGE_SCSI << 8, dev)))
break;
+ pcibios_alloc_irq(dev);
if (pci_enable_device(dev)) {
#if defined(DEBUG_PCI_DETECT)
printk
--
1.7.10.4
but I experience identical kexec shutdown and restart problems as with
the second version of your patch, as seen here:
http://www.users.on.net/~arthur.marsh/20150910541.jpg
the original commit 991de2e59090e55c65a7f59a049142e3c480f7bd quoted
above seems to have not only lead to start-up problems unless irqpoll
was enabled but also lead to kexec shutdown/restart problems.
I'm not sure what the solution is but it is good to continue to allow
kexec reboots to work.
Arthur.
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