[SPARC64]: Fix loop termination in mark_kpte_bitmap()

If we were aligned, but didn't have at least 256MB left
to process, we would loop forever.

Thanks to fabbione for the report and testing the fix.

Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/arch/sparc64/mm/init.c b/arch/sparc64/mm/init.c
index 5930e87dafbc32e2e0f76abf6299de38def0416e..9bbd0bf64af0f44fabfc1f2857256f71b7556a5f 100644 (file)
--- a/arch/sparc64/mm/init.c
+++ b/arch/sparc64/mm/init.c
@@ -973,12 +973,15 @@ static void __init mark_kpte_bitmap(unsigned long start, unsigned long end)
        while (start < end) {
                long remains;
 
+               remains = end - start;
+               if (remains < size_256MB)
+                       break;
+
                if (start & mask_256MB) {
                        start = (start + size_256MB) & ~mask_256MB;
                        continue;
                }
 
-               remains = end - start;
                while (remains >= size_256MB) {
                        unsigned long index = start >> shift_256MB;