x86: fix build breakage when PCI is define and PARAVIRT is not

- Fix the the build breakage when PARAVIRT is defined
  but PCI is not
  This fixes problem reported at:
	http://marc.info/?l=linux-kernel&m=120525966600698&w=2
- Make is_vsmp_box() available even when PARAVIRT is not defined.
  This is needed to determine if tsc's are reliable as a time source
  even when PARAVIRT is not defined.
- split vsmp_init to use is_vsmp_box() and set_vsmp_pv_ops()
  set_vsmp_pv_ops will do nothing if PCI is not enabled in the config.

Signed-off-by: Ravikiran Thirumalai <kiran@scalex86.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

4 files changed, 46 insertions, 37 deletions

diff --git a/arch/x86/kernel/Makefile b/arch/x86/kernel/Makefile
index d5a05a0cef62..1fe841a86f7e 100644
--- a/arch/x86/kernel/Makefile
+++ b/arch/x86/kernel/Makefile
@@ -60,7 +60,7 @@ obj-$(CONFIG_KEXEC)		+= relocate_kernel_$(BITS).o crash.o
 obj-$(CONFIG_CRASH_DUMP)        += crash_dump_$(BITS).o
 obj-$(CONFIG_X86_NUMAQ)         += numaq_32.o
 obj-$(CONFIG_X86_SUMMIT_NUMA)   += summit_32.o
-obj-$(CONFIG_PARAVIRT)          += vsmp_64.o
+obj-y                           += vsmp_64.o
 obj-$(CONFIG_KPROBES)           += kprobes.o
 obj-$(CONFIG_MODULES)           += module_$(BITS).o
 obj-$(CONFIG_ACPI_SRAT)         += srat_32.o
diff --git a/arch/x86/kernel/setup_64.c b/arch/x86/kernel/setup_64.c
index 990724143c43..20034493b5ad 100644
--- a/arch/x86/kernel/setup_64.c
+++ b/arch/x86/kernel/setup_64.c
@@ -351,9 +351,7 @@ void __init setup_arch(char **cmdline_p)
         if (efi_enabled)
                 efi_init();
 
-#ifdef  CONFIG_PARAVIRT
         vsmp_init();
-#endif
 
         dmi_scan_machine();
 
diff --git a/arch/x86/kernel/vsmp_64.c b/arch/x86/kernel/vsmp_64.c
index eb25584c54c3..4a790a5f61b7 100644
--- a/arch/x86/kernel/vsmp_64.c
+++ b/arch/x86/kernel/vsmp_64.c
@@ -19,6 +19,7 @@
 #include <asm/io.h>
 #include <asm/paravirt.h>
 
+#if defined CONFIG_PCI && defined CONFIG_PARAVIRT
 /*
  * Interrupt control on vSMPowered systems:
  * ~AC is a shadow of IF.  If IF is 'on' AC should be 'off'
@@ -72,39 +73,11 @@ static unsigned __init vsmp_patch(u8 type, u16 clobbers, void *ibuf,
 
 }
 
-static int vsmp = -1;
-
-int is_vsmp_box(void)
-{
-        if (vsmp != -1)
-                return vsmp;
-
-        vsmp = 0;
-        if (!early_pci_allowed())
-                return vsmp;
-
-        /* Check if we are running on a ScaleMP vSMP box */
-        if ((read_pci_config_16(0, 0x1f, 0, PCI_VENDOR_ID) ==
-             PCI_VENDOR_ID_SCALEMP) &&
-            (read_pci_config_16(0, 0x1f, 0, PCI_DEVICE_ID) ==
-            PCI_DEVICE_ID_SCALEMP_VSMP_CTL))
-                vsmp = 1;
-
-        return vsmp;
-}
-
-void __init vsmp_init(void)
+static void __init set_vsmp_pv_ops(void)
 {
         void *address;
         unsigned int cap, ctl, cfg;
 
-        if (!is_vsmp_box())
-                return;
-
-        if (!early_pci_allowed())
-                return;
-
-        /* If we are, use the distinguished irq functions */
         pv_irq_ops.irq_disable = vsmp_irq_disable;
         pv_irq_ops.irq_enable  = vsmp_irq_enable;
         pv_irq_ops.save_fl  = vsmp_save_fl;
@@ -127,5 +100,46 @@ void __init vsmp_init(void)
         }
 
         early_iounmap(address, 8);
+}
+#else
+static void __init set_vsmp_pv_ops(void)
+{
+}
+#endif
+
+#ifdef CONFIG_PCI
+static int vsmp = -1;
+
+int is_vsmp_box(void)
+{
+        if (vsmp != -1)
+                return vsmp;
+
+        vsmp = 0;
+        if (!early_pci_allowed())
+                return vsmp;
+
+        /* Check if we are running on a ScaleMP vSMP box */
+        if ((read_pci_config_16(0, 0x1f, 0, PCI_VENDOR_ID) ==
+             PCI_VENDOR_ID_SCALEMP) &&
+            (read_pci_config_16(0, 0x1f, 0, PCI_DEVICE_ID) ==
+            PCI_DEVICE_ID_SCALEMP_VSMP_CTL))
+                vsmp = 1;
+
+        return vsmp;
+}
+#else
+int is_vsmp_box(void)
+{
+        return 0;
+}
+#endif
+
+void __init vsmp_init(void)
+{
+        if (!is_vsmp_box())
+                return;
+
+        set_vsmp_pv_ops();
         return;
 }
diff --git a/include/asm-x86/apic.h b/include/asm-x86/apic.h
index b804238489a1..b11d6524fb13 100644
--- a/include/asm-x86/apic.h
+++ b/include/asm-x86/apic.h
@@ -50,19 +50,16 @@ extern int disable_apic_timer;
  */
 #ifdef CONFIG_PARAVIRT
 #include <asm/paravirt.h>
-extern int is_vsmp_box(void);
 #else
 #define apic_write native_apic_write
 #define apic_write_atomic native_apic_write_atomic
 #define apic_read native_apic_read
 #define setup_boot_clock setup_boot_APIC_clock
 #define setup_secondary_clock setup_secondary_APIC_clock
-static int inline is_vsmp_box(void)
-{
-        return 0;
-}
 #endif
 
+extern int is_vsmp_box(void);
+
 static inline void native_apic_write(unsigned long reg, u32 v)
 {
         *((volatile u32 *)(APIC_BASE + reg)) = v;