1 files changed, 8 insertions, 8 deletions

diff --git a/arch/x86_64/kernel/e820.c b/arch/x86_64/kernel/e820.c
index 116ac5f53dce..bb0ae18ec02b 100644
--- a/arch/x86_64/kernel/e820.c
+++ b/arch/x86_64/kernel/e820.c
@@ -567,7 +567,7 @@ unsigned long pci_mem_start = 0xaeedbabe;
  */
 __init void e820_setup_gap(void)
 {
-        unsigned long gapstart, gapsize;
+        unsigned long gapstart, gapsize, round;
         unsigned long last;
         int i;
         int found = 0;
@@ -604,14 +604,14 @@ __init void e820_setup_gap(void)
         }
 
         /*
-         * Start allocating dynamic PCI memory a bit into the gap,
-         * aligned up to the nearest megabyte.
-         *
-         * Question: should we try to pad it up a bit (do something
-         * like " + (gapsize >> 3)" in there too?). We now have the
-         * technology.
+         * See how much we want to round up: start off with
+         * rounding to the next 1MB area.
          */
-        pci_mem_start = (gapstart + 0xfffff) & ~0xfffff;
+        round = 0x100000;
+        while ((gapsize >> 4) > round)
+                round += round;
+        /* Fun with two's complement */
+        pci_mem_start = (gapstart + round) & -round;
 
         printk(KERN_INFO "Allocating PCI resources starting at %lx (gap: %lx:%lx)\n",
                 pci_mem_start, gapstart, gapsize);