powerpc/mm: Fix build error with FLATMEM book3s64 config

[linux-2.6-block.git] / arch / powerpc / include / asm / book3s / 64 / hash-64k.h

diff --git a/arch/powerpc/include/asm/book3s/64/hash-64k.h b/arch/powerpc/include/asm/book3s/64/hash-64k.h
index f82ee8a3b561718c4a138b392fe6bfeb2990aea4..81f4eb6e7da4c0eaa3df776790ce49b2d8587708 100644 (file)
--- a/arch/powerpc/include/asm/book3s/64/hash-64k.h
+++ b/arch/powerpc/include/asm/book3s/64/hash-64k.h
@@ -2,10 +2,11 @@
 #ifndef _ASM_POWERPC_BOOK3S_64_HASH_64K_H
 #define _ASM_POWERPC_BOOK3S_64_HASH_64K_H
 
-#define H_PTE_INDEX_SIZE  8
-#define H_PMD_INDEX_SIZE  10
-#define H_PUD_INDEX_SIZE  10
-#define H_PGD_INDEX_SIZE  8
+#define H_PTE_INDEX_SIZE   8  // size: 8B <<  8 = 2KB, maps 2^8  x 64KB = 16MB
+#define H_PMD_INDEX_SIZE  10  // size: 8B << 10 = 8KB, maps 2^10 x 16MB = 16GB
+#define H_PUD_INDEX_SIZE  10  // size: 8B << 10 = 8KB, maps 2^10 x 16GB = 16TB
+#define H_PGD_INDEX_SIZE   8  // size: 8B <<  8 = 2KB, maps 2^8  x 16TB =  4PB
+
 
 /*
  * Each context is 512TB size. SLB miss for first context/default context