[PATCH] powerpc: Replace VMALLOCBASE with VMALLOC_START

On ppc64, we independently define VMALLOCBASE and VMALLOC_START to be
the same thing: the start of the vmalloc() area at 0xd000000000000000.
VMALLOC_START is used much more widely, including in generic code, so
this patch gets rid of the extraneous VMALLOCBASE.

This does require moving the definitions of region IDs from page_64.h
to pgtable.h, but they don't clearly belong in the former rather than
the latter, anyway.  While we're moving them, clean up the definitions
of the REGION_IDs:
	- Abolish REGION_SIZE, it was only used once, to define
REGION_MASK anyway
	- Define the specific region ids in terms of the REGION_ID()
macro.
	- Define KERNEL_REGION_ID in terms of PAGE_OFFSET rather than
KERNELBASE.  It amounts to the same thing, but conceptually this is
about the region of the linear mapping (which starts at PAGE_OFFSET)
rather than of the kernel text itself (which is at KERNELBASE).

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Paul Mackerras <paulus@samba.org>

2 files changed, 11 insertions, 10 deletions

diff --git a/include/asm-powerpc/page_64.h b/include/asm-powerpc/page_64.h
index 6642c0125001..8a07a93b0321 100644
--- a/include/asm-powerpc/page_64.h
+++ b/include/asm-powerpc/page_64.h
@@ -25,16 +25,6 @@
  */
 #define PAGE_FACTOR             (PAGE_SHIFT - HW_PAGE_SHIFT)
 
-#define REGION_SIZE   4UL
-#define REGION_SHIFT  60UL
-#define REGION_MASK   (((1UL<<REGION_SIZE)-1UL)<<REGION_SHIFT)
-
-#define VMALLOCBASE             ASM_CONST(0xD000000000000000)
-#define VMALLOC_REGION_ID       (VMALLOCBASE >> REGION_SHIFT)
-#define KERNEL_REGION_ID        (KERNELBASE >> REGION_SHIFT)
-#define USER_REGION_ID          (0UL)
-#define REGION_ID(ea)           (((unsigned long)(ea)) >> REGION_SHIFT)
-
 /* Segment size */
 #define SID_SHIFT               28
 #define SID_MASK                0xfffffffffUL
diff --git a/include/asm-powerpc/pgtable.h b/include/asm-powerpc/pgtable.h
index 0303f57366c1..3518adb2cc18 100644
--- a/include/asm-powerpc/pgtable.h
+++ b/include/asm-powerpc/pgtable.h
@@ -58,6 +58,17 @@ struct mm_struct;
 #define IMALLOC_END     (VMALLOC_START + PGTABLE_RANGE)
 
 /*
+ * Region IDs
+ */
+#define REGION_SHIFT            60UL
+#define REGION_MASK             (0xfUL << REGION_SHIFT)
+#define REGION_ID(ea)           (((unsigned long)(ea)) >> REGION_SHIFT)
+
+#define VMALLOC_REGION_ID       (REGION_ID(VMALLOC_START))
+#define KERNEL_REGION_ID        (REGION_ID(PAGE_OFFSET))
+#define USER_REGION_ID          (0UL)
+
+/*
  * Common bits in a linux-style PTE.  These match the bits in the
  * (hardware-defined) PowerPC PTE as closely as possible. Additional
  * bits may be defined in pgtable-*.h