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

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Message-ID: <alpine.DEB.2.02.1401071327510.8667@kaball.uk.xensource.com>
Date:	Tue, 7 Jan 2014 13:30:10 +0000
From:	Stefano Stabellini <stefano.stabellini@...citrix.com>
To:	Yinghai Lu <yinghai@...nel.org>
CC:	Stefano Stabellini <stefano.stabellini@...citrix.com>,
	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 Mon, 6 Jan 2014, Yinghai Lu wrote:
> 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?

Just this patch.
The whole tree (yinghai/for-x86-irq-3.14) builds just fine.
Thanks!

- Stefano
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