x86: refactor ->enable_apic_mode() subarch methods

Only ES7000 has a real ->enable_apic_mode() method, the other
subarchitectures define it but keep it empty.

So mark the vector as NULL, extend the generic code to handle
NULL -setup_portio_remap() entries and remove all the empty
handlers.

Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 2 insertions, 1 deletions

diff --git a/arch/x86/kernel/apic.c b/arch/x86/kernel/apic.c
index fcbcc03cd4bd..9d6374da4784 100644
--- a/arch/x86/kernel/apic.c
+++ b/arch/x86/kernel/apic.c
@@ -1763,7 +1763,8 @@ void __init connect_bsp_APIC(void)
                 outb(0x01, 0x23);
         }
 #endif
-        enable_apic_mode();
+        if (apic->enable_apic_mode)
+                apic->enable_apic_mode();
 }
 
 /**