x86: unify KERNEL_PGD_PTRS

Make KERNEL_PGD_PTRS common, as previously it was only being defined
for 32-bit.

There are a couple of follow-on changes from this:
 - KERNEL_PGD_PTRS was being defined in terms of USER_PGD_PTRS.  The
   definition of USER_PGD_PTRS doesn't really make much sense on x86-64,
   since it can have two different user address-space configurations.
   I renamed USER_PGD_PTRS to KERNEL_PGD_BOUNDARY, which is meaningful
   for all of 32/32, 32/64 and 64/64 process configurations.

 - USER_PTRS_PER_PGD was also defined and was being used for similar
   purposes.  Converting its users to KERNEL_PGD_BOUNDARY left it
   completely unused, and so I removed it.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Cc: Andi Kleen <ak@suse.de>
Cc: Zach Amsden <zach@vmware.com>

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

1 files changed, 2 insertions, 2 deletions

diff --git a/arch/x86/kernel/reboot.c b/arch/x86/kernel/reboot.c
index 19c9386ac118..1791a751a772 100644
--- a/arch/x86/kernel/reboot.c
+++ b/arch/x86/kernel/reboot.c
@@ -8,6 +8,7 @@
 #include <asm/apic.h>
 #include <asm/desc.h>
 #include <asm/hpet.h>
+#include <asm/pgtable.h>
 #include <asm/reboot_fixups.h>
 #include <asm/reboot.h>
 
@@ -15,7 +16,6 @@
 # include <linux/dmi.h>
 # include <linux/ctype.h>
 # include <linux/mc146818rtc.h>
-# include <asm/pgtable.h>
 #else
 # include <asm/iommu.h>
 #endif
@@ -275,7 +275,7 @@ void machine_real_restart(unsigned char *code, int length)
         /* Remap the kernel at virtual address zero, as well as offset zero
            from the kernel segment.  This assumes the kernel segment starts at
            virtual address PAGE_OFFSET. */
-        memcpy(swapper_pg_dir, swapper_pg_dir + USER_PGD_PTRS,
+        memcpy(swapper_pg_dir, swapper_pg_dir + KERNEL_PGD_BOUNDARY,
                 sizeof(swapper_pg_dir [0]) * KERNEL_PGD_PTRS);
 
         /*