linux-kernel - Re: [Xen-devel] [PATCH v5 16/33] xen, irq: Call irq_alloc_reserved_desc

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Date:	Mon, 6 Jan 2014 12:00:28 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	Stefano Stabellini <stefano.stabellini@...citrix.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>,
	Xen Devel <xen-devel@...ts.xensource.com>,
	"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: [Xen-devel] [PATCH v5 16/33] xen, irq: Call irq_alloc_reserved_desc_at()
 at first

On Fri, Jan 3, 2014 at 9:50 AM, Stefano Stabellini
<stefano.stabellini@...citrix.com> wrote:

>>  drivers/xen/events.c | 8 ++++++--
>>  1 file changed, 6 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/xen/events.c b/drivers/xen/events.c
>> index 4035e83..020cd77 100644
>> --- a/drivers/xen/events.c
>> +++ b/drivers/xen/events.c
>> @@ -508,8 +508,12 @@ static int __must_check xen_allocate_irq_gsi(unsigned gsi)
>>       /* Legacy IRQ descriptors are already allocated by the arch. */
>>       if (gsi < NR_IRQS_LEGACY)
>>               irq = gsi;
>> -     else
>> -             irq = irq_alloc_desc_at(gsi, -1);
>> +     else {
>> +             /* for x86, irq already get reserved for gsi */
>> +             irq = irq_alloc_reserved_desc_at(gsi, -1);
>> +             if (irq < 0)
>> +                     irq = irq_alloc_desc_at(gsi, -1);
>> +     }
>
> This is common code. On ARM I get:
>
> drivers/xen/events.c: In function 'xen_allocate_irq_gsi':
> drivers/xen/events.c:513:3: error: implicit declaration of function 'irq_alloc_reserved_desc_at' [-Werror=implicit-function-declaration]
>    irq = irq_alloc_reserved_desc_at(gsi, -1);
>    ^
> cc1: some warnings being treated as errors

It's strange.

that is defined with irq_alloc_desc_at in parallel in
include/linux/irq.h and kernel/irq/irqdesc.c.

Did you try the whole tree, or just this patch?

Thanks

Yinghai
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