x86: increase MAX_APICS for very large x86-64 configs
Increase the maximum number of apics when running very large
configurations. This patch has no affect on most systems.
The patch has no effect on any 32-bit kernel. It adds ~4k to the size
of 64-bit kernels but only if NR_CPUS > 255.
Signed-off-by: Jack Steiner <steiner@sgi.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/include/asm-x86/mpspec_def.h b/include/asm-x86/mpspec_def.h
index dc6ef85..38d1e73 100644
--- a/include/asm-x86/mpspec_def.h
+++ b/include/asm-x86/mpspec_def.h
@@ -17,10 +17,11 @@
# define MAX_MPC_ENTRY 1024
# define MAX_APICS 256
#else
-/*
- * A maximum of 255 APICs with the current APIC ID architecture.
- */
-# define MAX_APICS 255
+# if NR_CPUS <= 255
+# define MAX_APICS 255
+# else
+# define MAX_APICS 32768
+# endif
#endif
struct intel_mp_floating {