x86: fix pte allocation in "x86: introduce init_memory_mapping for 32bit"

The patch "x86: introduce init_memory_mapping for 32bit" does not allocate
enough space for PTEs if the CPU does not implement PSE.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Acked-by: Yinghai Lu <yhlu.kernel@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 5 insertions, 0 deletions

diff --git a/arch/x86/mm/init_32.c b/arch/x86/mm/init_32.c
index c059c460e32d..156000de6e62 100644
--- a/arch/x86/mm/init_32.c
+++ b/arch/x86/mm/init_32.c
@@ -733,6 +733,11 @@ static void __init find_early_table_space(unsigned long end)
         pmds = (end + PMD_SIZE - 1) >> PMD_SHIFT;
         tables += PAGE_ALIGN(pmds * sizeof(pmd_t));
 
+        if (!cpu_has_pse) {
+                int ptes = (end + PAGE_SIZE - 1) >> PAGE_SHIFT;
+                tables += PAGE_ALIGN(ptes * sizeof(pte_t));
+        }
+
         /*
          * RED-PEN putting page tables only on node 0 could
          * cause a hotspot and fill up ZONE_DMA. The page tables