linux-kernel - Re: [PATCH v4 26/28] PCI, x86, ACPI: Link acpi ioapic register to ioapic

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Date:	Mon, 26 Aug 2013 17:40:57 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	rui wang <ruiv.wang@...il.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...e.hu>,
	"H. Peter Anvin" <hpa@...or.com>, Tony Luck <tony.luck@...el.com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>
Subject: Re: [PATCH v4 26/28] PCI, x86, ACPI: Link acpi ioapic register to ioapic

On Fri, Aug 23, 2013 at 5:51 PM, rui wang <ruiv.wang@...il.com> wrote:
> On 8/11/13, Yinghai Lu <yinghai@...nel.org> wrote:
>> During ioapic hotplug, acpi_register_ioapic will be called.
>> Now for x86, that function is blank.
>> Fill that will update __mp_register_ioapic to use those ioapic.
>>
>> Signed-off-by: Yinghai Lu <yinghai@...nel.org>
>> ---
>>  arch/x86/kernel/acpi/boot.c | 10 ++++++----
>>  1 file changed, 6 insertions(+), 4 deletions(-)
>>
>> diff --git a/arch/x86/kernel/acpi/boot.c b/arch/x86/kernel/acpi/boot.c
>> index 5be15d1..4a5336d 100644
>> --- a/arch/x86/kernel/acpi/boot.c
>> +++ b/arch/x86/kernel/acpi/boot.c
>> @@ -707,16 +707,18 @@ EXPORT_SYMBOL(acpi_unmap_lsapic);
>>
>>  int acpi_register_ioapic(acpi_handle handle, u64 phys_addr, u32 gsi_base)
>>  {
>> -     /* TBD */
>> -     return -EINVAL;
>> +     unsigned long long id = 0;
>> +
>> +     acpi_evaluate_integer(handle, "_UID", NULL, &id);
>
> We cannot assume that "_UID" is an integer. "_UID" can be either an
> integer or a string. Need to consider the case when it is a string.

Yes.

But do you have test case for ioapic that _UID is not integer?

Thanks

Yinghai
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