[PATCH] memory page alloc minor cleanups

- s/freeliest/freelist/ spelling fix

- Check for NULL *z zone seems useless - even if it could happen, so
  what?  Perhaps we should have a check later on if we are faced with an
  allocation request that is not allowed to fail - shouldn't that be a
  serious kernel error, passing an empty zonelist with a mandate to not
  fail?

- Initializing 'z' to zonelist->zones can wait until after the first
  get_page_from_freelist() fails; we only use 'z' in the wakeup_kswapd()
  loop, so let's initialize 'z' there, in a 'for' loop.  Seems clearer.

- Remove superfluous braces around a break

- Fix a couple errant spaces

- Adjust indentation on the cpuset_zone_allowed() check, to match the
  lines just before it -- seems easier to read in this case.

- Add another set of braces to the zone_watermark_ok logic

From: Paul Jackson <pj@sgi.com>

  Backout one item from a previous "memory page_alloc minor cleanups" patch.
   Until and unless we are certain that no one can ever pass an empty zonelist
  to __alloc_pages(), this check for an empty zonelist (or some BUG
  equivalent) is essential.  The code in get_page_from_freelist() blow ups if
  passed an empty zonelist.

Signed-off-by: Paul Jackson <pj@sgi.com>
Acked-by: Christoph Lameter <clameter@sgi.com>
Cc: Nick Piggin <nickpiggin@yahoo.com.au>
Signed-off-by: Paul Jackson <pj@sgi.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 10 insertions, 10 deletions

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index aa6fcc7ca66..08360aa111f 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -486,7 +486,7 @@ static void free_one_page(struct zone *zone, struct page *page, int order)
         spin_lock(&zone->lock);
         zone->all_unreclaimable = 0;
         zone->pages_scanned = 0;
-        __free_one_page(page, zone ,order);
+        __free_one_page(page, zone, order);
         spin_unlock(&zone->lock);
 }
 
@@ -926,7 +926,7 @@ int zone_watermark_ok(struct zone *z, int order, unsigned long mark,
 }
 
 /*
- * get_page_from_freeliest goes through the zonelist trying to allocate
+ * get_page_from_freelist goes through the zonelist trying to allocate
  * a page.
  */
 static struct page *
@@ -948,8 +948,8 @@ get_page_from_freelist(gfp_t gfp_mask, unsigned int order,
                         zone->zone_pgdat != zonelist->zones[0]->zone_pgdat))
                                 break;
                 if ((alloc_flags & ALLOC_CPUSET) &&
-                                !cpuset_zone_allowed(zone, gfp_mask))
-                        continue;
+                        !cpuset_zone_allowed(zone, gfp_mask))
+                                continue;
 
                 if (!(alloc_flags & ALLOC_NO_WATERMARKS)) {
                         unsigned long mark;
@@ -959,17 +959,18 @@ get_page_from_freelist(gfp_t gfp_mask, unsigned int order,
                                 mark = zone->pages_low;
                         else
                                 mark = zone->pages_high;
-                        if (!zone_watermark_ok(zone , order, mark,
-                                    classzone_idx, alloc_flags))
+                        if (!zone_watermark_ok(zone, order, mark,
+                                    classzone_idx, alloc_flags)) {
                                 if (!zone_reclaim_mode ||
                                     !zone_reclaim(zone, gfp_mask, order))
                                         continue;
+                        }
                 }
 
                 page = buffered_rmqueue(zonelist, zone, order, gfp_mask);
-                if (page) {
+                if (page)
                         break;
-                }
+
         } while (*(++z) != NULL);
         return page;
 }
@@ -1005,9 +1006,8 @@ restart:
         if (page)
                 goto got_pg;
 
-        do {
+        for (z = zonelist->zones; *z; z++)
                 wakeup_kswapd(*z, order);
-        } while (*(++z));
 
         /*
          * OK, we're below the kswapd watermark and have kicked background