linux-next: manual merge of the block tree with Linus' tree

[Stephen Rothwell]

Hi Jens,

Today's linux-next merge of the block tree got a conflict in
mm/page-writeback.c between commit 464d1387acb9 ("writeback: use |1
instead of +1 to protect against div by zero") from Linus' tree and
commit de1fff37b278 ("writeback: s/bdi/wb/ in mm/page-writeback.c")
from the block tree.

I fixed it up (see below) and can carry the fix as necessary (no action
is required).

-- 
Cheers,
Stephen Rothwell                    s...@canb.auug.org.au

diff --cc mm/page-writeback.c
index eb59f7eea508,e1514d5b4e9b..000000000000
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@@ -802,27 -990,27 +990,27 @@@ static void wb_position_ratio(struct di
         * threshold, so that the occasional writes won't be blocked and active
         * writes can rampup the threshold quickly.
         */
-       bdi_thresh = max(bdi_thresh, (limit - dirty) / 8);
+       wb_thresh = max(wb_thresh, (limit - dtc->dirty) / 8);
        /*
-        * scale global setpoint to bdi's:
-        *      bdi_setpoint = setpoint * bdi_thresh / thresh
+        * scale global setpoint to wb's:
+        *      wb_setpoint = setpoint * wb_thresh / thresh
         */
-       x = div_u64((u64)bdi_thresh << 16, thresh | 1);
-       bdi_setpoint = setpoint * (u64)x >> 16;
 -      x = div_u64((u64)wb_thresh << 16, dtc->thresh + 1);
++      x = div_u64((u64)wb_thresh << 16, dtc->thresh | 1);
+       wb_setpoint = setpoint * (u64)x >> 16;
        /*
-        * Use span=(8*write_bw) in single bdi case as indicated by
-        * (thresh - bdi_thresh ~= 0) and transit to bdi_thresh in JBOD case.
+        * Use span=(8*write_bw) in single wb case as indicated by
+        * (thresh - wb_thresh ~= 0) and transit to wb_thresh in JBOD case.
         *
-        *        bdi_thresh                    thresh - bdi_thresh
-        * span = ---------- * (8 * write_bw) + ------------------- * bdi_thresh
-        *          thresh                            thresh
+        *        wb_thresh                    thresh - wb_thresh
+        * span = --------- * (8 * write_bw) + ------------------ * wb_thresh
+        *         thresh                           thresh
         */
-       span = (thresh - bdi_thresh + 8 * write_bw) * (u64)x >> 16;
-       x_intercept = bdi_setpoint + span;
+       span = (dtc->thresh - wb_thresh + 8 * write_bw) * (u64)x >> 16;
+       x_intercept = wb_setpoint + span;
  
-       if (bdi_dirty < x_intercept - span / 4) {
-               pos_ratio = div64_u64(pos_ratio * (x_intercept - bdi_dirty),
-                                     (x_intercept - bdi_setpoint) | 1);
+       if (dtc->wb_dirty < x_intercept - span / 4) {
+               pos_ratio = div64_u64(pos_ratio * (x_intercept - dtc->wb_dirty),
 -                                    x_intercept - wb_setpoint + 1);
++                                    (x_intercept - wb_setpoint) | 1);
        } else
                pos_ratio /= 4;
  

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