linux-kernel - Re: [PATCH] Fix section type conflict in arch/ia64/xen/xen_pv

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Date:	Thu, 06 Nov 2008 20:15:25 +0100
From:	Takashi Iwai <tiwai@...e.de>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
Cc:	Tony Luck <tony.luck@...el.com>,
	Isaku Yamahata <yamahata@...inux.co.jp>,
	linux-kernel@...r.kernel.org, Sam Ravnborg <sam@...nborg.org>
Subject: Re: [PATCH] Fix section type conflict in arch/ia64/xen/xen_pv_ops.c

At Thu, 06 Nov 2008 10:57:21 -0800,
Jeremy Fitzhardinge wrote:
> 
> Takashi Iwai wrote:
> > __initdata and const cannot be always a happy pair, as gcc-4.3.3 gives
> > the compile errors like:
> >
> >   arch/ia64/xen/xen_pv_ops.c:156: error: xen_init_ops causes a section type conflict
> >   arch/ia64/xen/xen_pv_ops.c:340: error: xen_iosapic_ops causes a section type conflict
> >
> > This patch simply removes const from data with __initdata.
> >   
> 
> Yeah, I've seen these sort of messages before, but I don't see why 
> there's an inherent problem with having const __initdata.

Oh, wait; just looking through linux/init.h, I see we have now
__initconst.  Maybe this is the right choice?

This would be better documented somewhere in Documentation/*...


thanks,

Takashi


> 
> Sam?
> 
>     J
> 
> > Signed-off-by: Takashi Iwai <tiwai@...e.de>
> >
> > ---
> > diff --git a/arch/ia64/xen/xen_pv_ops.c b/arch/ia64/xen/xen_pv_ops.c
> > index 04cd123..5d491d9 100644
> > --- a/arch/ia64/xen/xen_pv_ops.c
> > +++ b/arch/ia64/xen/xen_pv_ops.c
> > @@ -153,7 +153,7 @@ xen_post_smp_prepare_boot_cpu(void)
> >  	xen_setup_vcpu_info_placement();
> >  }
> >  
> > -static const struct pv_init_ops xen_init_ops __initdata = {
> > +static struct pv_init_ops xen_init_ops __initdata = {
> >  	.banner = xen_banner,
> >  
> >  	.reserve_memory = xen_reserve_memory,
> > @@ -260,7 +260,7 @@ xen_intrin_local_irq_restore(unsigned long mask)
> >  		xen_rsm_i();
> >  }
> >  
> > -static const struct pv_cpu_ops xen_cpu_ops __initdata = {
> > +static struct pv_cpu_ops xen_cpu_ops __initdata = {
> >  	.fc		= xen_fc,
> >  	.thash		= xen_thash,
> >  	.get_cpuid	= xen_get_cpuid,
> > @@ -337,7 +337,7 @@ xen_iosapic_write(char __iomem *iosapic, unsigned int reg, u32 val)
> >  	HYPERVISOR_physdev_op(PHYSDEVOP_apic_write, &apic_op);
> >  }
> >  
> > -static const struct pv_iosapic_ops xen_iosapic_ops __initdata = {
> > +static struct pv_iosapic_ops xen_iosapic_ops __initdata = {
> >  	.pcat_compat_init = xen_pcat_compat_init,
> >  	.__get_irq_chip = xen_iosapic_get_irq_chip,
> >  
> >   
> 
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