Subject: writeback: i386 compile fix
Date: Sun Apr 17 09:04:44 CST 2011


mm/built-in.o: In function `bdi_position_ratio':
page-writeback.c:(.text+0x5c83): undefined reference to `__udivdi3'
mm/built-in.o: In function `calc_period_shift.part.10':
page-writeback.c:(.text+0x6446): undefined reference to `____ilog2_NaN'
make[4]: *** [.tmp_vmlinux1] Error

Reported-by: Sedat Dilek <sedat.dilek@googlemail.com>
Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
---
 mm/page-writeback.c |    7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

--- linux-next.orig/mm/page-writeback.c	2011-04-17 09:02:32.000000000 +0800
+++ linux-next/mm/page-writeback.c	2011-04-17 09:03:58.000000000 +0800
@@ -634,9 +634,10 @@ static unsigned long bdi_position_ratio(
 	origin = bdi->avg_write_bandwidth + 2 * MIN_WRITEBACK_PAGES;
 	origin = min(origin, thresh - thresh / DIRTY_FULL_SCOPE);
 	if (bdi_dirty < origin) {
-		if (bdi_dirty > origin / 4)
-			bw = bw * origin / bdi_dirty;
-		else
+		if (bdi_dirty > origin / 4) {
+			bw *= origin;
+			do_div(bw, bdi_dirty);
+		} else
 			bw = bw * 4;
 	}