linux-kernel - [PATCH] x86/jailhouse: fix building without X86

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Date:   Mon, 15 Jan 2018 21:23:21 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     Jan Kiszka <jan.kiszka@...mens.com>,
        Thomas Gleixner <tglx@...utronix.de>, x86@...nel.org
Cc:     jailhouse-dev@...glegroups.com, Arnd Bergmann <arnd@...db.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>, Juergen Gross <jgross@...e.com>,
        Dou Liyang <douly.fnst@...fujitsu.com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH] x86/jailhouse: fix building without X86_X2APIC

When CONFIG_X86_X2APIC is disabled, jailhouse fails to build:

arch/x86/kernel/jailhouse.c: In function 'jailhouse_get_smp_config':
arch/x86/kernel/jailhouse.c:73:3: error: 'x2apic_phys' undeclared (first use in this function); did you mean 'x2apic_mode'?

The code is protected by an appropriate x2apic_enabled() check that leads
to the assignment being optimized out without a link-time reference to
x2apic_phys, so we just lack a declaration.

Let's move x2apic_mode and x2apic_phys outside of the #ifdef together,
for consistency.

Fixes: 11c8dc419bbc ("x86/jailhouse: Enable APIC and SMP support")
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 arch/x86/include/asm/apic.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/x86/include/asm/apic.h b/arch/x86/include/asm/apic.h
index 98722773391d..0317d635d9ba 100644
--- a/arch/x86/include/asm/apic.h
+++ b/arch/x86/include/asm/apic.h
@@ -188,6 +188,8 @@ static inline void lapic_assign_system_vectors(void) { }
 static inline void lapic_assign_legacy_vector(unsigned int i, bool r) { }
 #endif /* !CONFIG_X86_LOCAL_APIC */
 
+extern int x2apic_mode;
+extern int x2apic_phys;
 #ifdef CONFIG_X86_X2APIC
 /*
  * Make previous memory operations globally visible before
@@ -249,8 +251,6 @@ static inline u64 native_x2apic_icr_read(void)
 	return val;
 }
 
-extern int x2apic_mode;
-extern int x2apic_phys;
 extern void __init check_x2apic(void);
 extern void x2apic_setup(void);
 static inline int x2apic_enabled(void)
-- 
2.9.0