2 files changed, 16 insertions, 18 deletions

diff --git a/arch/powerpc/mm/40x_mmu.c b/arch/powerpc/mm/40x_mmu.c
index e067df836be2..3899ea97fbdf 100644
--- a/arch/powerpc/mm/40x_mmu.c
+++ b/arch/powerpc/mm/40x_mmu.c
@@ -98,13 +98,12 @@ unsigned long __init mmu_mapin_ram(void)
 
         v = KERNELBASE;
         p = PPC_MEMSTART;
-        s = 0;
+        s = total_lowmem;
 
-        if (__map_without_ltlbs) {
-                return s;
-        }
+        if (__map_without_ltlbs)
+                return 0;
 
-        while (s <= (total_lowmem - LARGE_PAGE_SIZE_16M)) {
+        while (s >= LARGE_PAGE_SIZE_16M) {
                 pmd_t *pmdp;
                 unsigned long val = p | _PMD_SIZE_16M | _PAGE_HWEXEC | _PAGE_HWWRITE;
 
@@ -116,10 +115,10 @@ unsigned long __init mmu_mapin_ram(void)
 
                 v += LARGE_PAGE_SIZE_16M;
                 p += LARGE_PAGE_SIZE_16M;
-                s += LARGE_PAGE_SIZE_16M;
+                s -= LARGE_PAGE_SIZE_16M;
         }
 
-        while (s <= (total_lowmem - LARGE_PAGE_SIZE_4M)) {
+        while (s >= LARGE_PAGE_SIZE_4M) {
                 pmd_t *pmdp;
                 unsigned long val = p | _PMD_SIZE_4M | _PAGE_HWEXEC | _PAGE_HWWRITE;
 
@@ -128,8 +127,8 @@ unsigned long __init mmu_mapin_ram(void)
 
                 v += LARGE_PAGE_SIZE_4M;
                 p += LARGE_PAGE_SIZE_4M;
-                s += LARGE_PAGE_SIZE_4M;
+                s -= LARGE_PAGE_SIZE_4M;
         }
 
-        return s;
+        return total_lowmem - s;
 }
diff --git a/arch/ppc/mm/4xx_mmu.c b/arch/ppc/mm/4xx_mmu.c
index 838e09db71d9..ea785dbaac7c 100644
--- a/arch/ppc/mm/4xx_mmu.c
+++ b/arch/ppc/mm/4xx_mmu.c
@@ -99,13 +99,12 @@ unsigned long __init mmu_mapin_ram(void)
 
         v = KERNELBASE;
         p = PPC_MEMSTART;
-        s = 0;
+        s = total_lowmem;
 
-        if (__map_without_ltlbs) {
-                return s;
-        }
+        if (__map_without_ltlbs)
+                return 0;
 
-        while (s <= (total_lowmem - LARGE_PAGE_SIZE_16M)) {
+        while (s >= LARGE_PAGE_SIZE_16M) {
                 pmd_t *pmdp;
                 unsigned long val = p | _PMD_SIZE_16M | _PAGE_HWEXEC | _PAGE_HWWRITE;
 
@@ -117,10 +116,10 @@ unsigned long __init mmu_mapin_ram(void)
 
                 v += LARGE_PAGE_SIZE_16M;
                 p += LARGE_PAGE_SIZE_16M;
-                s += LARGE_PAGE_SIZE_16M;
+                s -= LARGE_PAGE_SIZE_16M;
         }
 
-        while (s <= (total_lowmem - LARGE_PAGE_SIZE_4M)) {
+        while (s >= LARGE_PAGE_SIZE_4M) {
                 pmd_t *pmdp;
                 unsigned long val = p | _PMD_SIZE_4M | _PAGE_HWEXEC | _PAGE_HWWRITE;
 
@@ -129,8 +128,8 @@ unsigned long __init mmu_mapin_ram(void)
 
                 v += LARGE_PAGE_SIZE_4M;
                 p += LARGE_PAGE_SIZE_4M;
-                s += LARGE_PAGE_SIZE_4M;
+                s -= LARGE_PAGE_SIZE_4M;
         }
 
-        return s;
+        return total_lowmem - s;
 }