linux-kernel - Re: [Xen-devel] printk from softirq on xen: hard lockup

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Message-ID: <CAHmME9r34QsbC-RuTw40PVOD-H7zQRwvPo0gdtesyV-V05vccA@mail.gmail.com>
Date:	Thu, 6 Aug 2015 18:21:32 +0200
From:	"Jason A. Donenfeld" <Jason@...c4.com>
To:	David Vrabel <david.vrabel@...rix.com>
Cc:	Ian Campbell <ian.campbell@...rix.com>, netdev@...r.kernel.org,
	Paul McKenney <paulmck@...ux.vnet.ibm.com>,
	linux-kernel@...r.kernel.org, xen-devel@...ts.xen.org
Subject: Re: [Xen-devel] printk from softirq on xen: hard lockup

In that case, it doesn't compile.

arch/x86/xen/apic.c:204:13: error: redefinition of ‘xen_init_apic’
 void __init xen_init_apic(void)
             ^
In file included from arch/x86/xen/apic.c:9:0:
arch/x86/xen/xen-ops.h:110:27: note: previous definition of
‘xen_init_apic’ was here
 static inline void __init xen_init_apic(void)

It looks like whoever wrote this explicitly didn't want that APIC
driver used on domU:

#ifdef CONFIG_XEN_DOM0
void __init xen_init_vga(const struct dom0_vga_console_info *, size_t size);
void __init xen_init_apic(void);
#else
static inline void __init xen_init_vga(const struct dom0_vga_console_info *info,
                                       size_t size)
{
}
static inline void __init xen_init_apic(void)
{
}
#endif
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