x86: add table_top check for alloc_low_page in 64 bit

that range is from find_e820_area, so don't try to use end_pfn to see
if out of boundary...use table_top instead to avoid possible strange
result while cross the boundary...

also change early_printk to printk, because init_memory_mapping is after
early param parsing, and console=uart8250 already working at that time.

Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 5 insertions, 4 deletions

diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
index 359e3afaaa6b..6eced2f10734 100644
--- a/arch/x86/mm/init_64.c
+++ b/arch/x86/mm/init_64.c
@@ -227,6 +227,7 @@ void __init cleanup_highmap(void)
 
 static unsigned long __initdata table_start;
 static unsigned long __meminitdata table_end;
+static unsigned long __meminitdata table_top;
 
 static __meminit void *alloc_low_page(unsigned long *phys)
 {
@@ -240,7 +241,7 @@ static __meminit void *alloc_low_page(unsigned long *phys)
                 return adr;
         }
 
-        if (pfn >= end_pfn)
+        if (pfn >= table_top)
                 panic("alloc_low_page: ran out of memory");
 
         adr = early_ioremap(pfn * PAGE_SIZE, PAGE_SIZE);
@@ -372,10 +373,10 @@ static void __init find_early_table_space(unsigned long end)
 
         table_start >>= PAGE_SHIFT;
         table_end = table_start;
+        table_top = table_start + (tables >> PAGE_SHIFT);
 
-        early_printk("kernel direct mapping tables up to %lx @ %lx-%lx\n",
-                end, table_start << PAGE_SHIFT,
-                (table_start << PAGE_SHIFT) + tables);
+        printk(KERN_DEBUG "kernel direct mapping tables up to %lx @ %lx-%lx\n",
+                end, table_start << PAGE_SHIFT, table_top << PAGE_SHIFT);
 }
 
 static void __init init_gbpages(void)