linux-kernel - Re: [PATCH] x86: fix: make PCI ECS for AMD CPUs hotplug capable

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Message-ID: <86802c440808221210x40057476p5566d0dc82032608@mail.gmail.com>
Date:	Fri, 22 Aug 2008 12:10:04 -0700
From:	"Yinghai Lu" <yhlu.kernel@...il.com>
To:	"Robert Richter" <robert.richter@....com>
Cc:	"Ingo Molnar" <mingo@...e.hu>,
	"Thomas Gleixner" <tglx@...utronix.de>,
	LKML <linux-kernel@...r.kernel.org>,
	"Jan Beulich" <jbeulich@...ell.com>
Subject: Re: [PATCH] x86: fix: make PCI ECS for AMD CPUs hotplug capable

On Fri, Aug 22, 2008 at 12:07 PM, Robert Richter <robert.richter@....com> wrote:
> On 22.08.08 11:56:08, Yinghai Lu wrote:
>
> [...]
>
>> > +static int __init pci_io_ecs_init(void)
>> > +{
>> > +       int cpu;
>> > +
>> >        /* assume all cpus from fam10h have IO ECS */
>> >         if (boot_cpu_data.x86 < 0x10)
>> >                return 0;
>> > -       on_each_cpu(enable_pci_io_ecs_per_cpu, NULL, 1);
>> > +
>> > +       register_cpu_notifier(&amd_cpu_notifier);
>> > +       for_each_online_cpu(cpu)
>> > +               amd_cpu_notify(&amd_cpu_notifier, (unsigned long)CPU_ONLINE,
>> > +                              (void *)(long)cpu);
>>
>> wonder if those two lines should be reversed.
>
> Do you mean setting PCI_HAS_IO_ECS before for_each_online_cpu(...)?
> PCI_HAS_IO_ECS will be used only in pci_direct_init(). PCI is
> initialized in a later init stage, so it doesn't matter. My intention
> was to set the bit after the setup of all online cpus is finished.


==>
+       for_each_online_cpu(cpu)
+               amd_cpu_notify(&amd_cpu_notifier, (unsigned long)CPU_ONLINE,
+                              (void *)(long)cpu);
+       register_cpu_notifier(&amd_cpu_notifier);

YH
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