Merge commit 'v2.6.30-rc6' into x86/mm

Merge reason: sync up to -rc6 which has changes to mm/ which we are
              going to touch in the commits to follow as well.

Signed-off-by: Ingo Molnar <mingo@elte.hu>

2 files changed, 12 insertions, 27 deletions

diff --git a/mm/madvise.c b/mm/madvise.c
index 36d6ea2b6340..b9ce574827c8 100644
--- a/mm/madvise.c
+++ b/mm/madvise.c
@@ -112,14 +112,6 @@ static long madvise_willneed(struct vm_area_struct * vma,
         if (!file)
                 return -EBADF;
 
-        /*
-         * Page cache readahead assumes page cache pages are order-0 which
-         * is not the case for hugetlbfs. Do not give a bad return value
-         * but ignore the advice.
-         */
-        if (vma->vm_flags & VM_HUGETLB)
-                return 0;
-
         if (file->f_mapping->a_ops->get_xip_mem) {
                 /* no bad return value, but ignore advice */
                 return 0;
diff --git a/mm/pdflush.c b/mm/pdflush.c
index f2caf96993f8..235ac440c44e 100644
--- a/mm/pdflush.c
+++ b/mm/pdflush.c
@@ -58,14 +58,6 @@ static DEFINE_SPINLOCK(pdflush_lock);
 int nr_pdflush_threads = 0;
 
 /*
- * The max/min number of pdflush threads. R/W by sysctl at
- * /proc/sys/vm/nr_pdflush_threads_max/min
- */
-int nr_pdflush_threads_max __read_mostly = MAX_PDFLUSH_THREADS;
-int nr_pdflush_threads_min __read_mostly = MIN_PDFLUSH_THREADS;
-
-
-/*
  * The time at which the pdflush thread pool last went empty
  */
 static unsigned long last_empty_jifs;
@@ -76,7 +68,7 @@ static unsigned long last_empty_jifs;
  * Thread pool management algorithm:
  * 
  * - The minimum and maximum number of pdflush instances are bound
- *   by nr_pdflush_threads_min and nr_pdflush_threads_max.
+ *   by MIN_PDFLUSH_THREADS and MAX_PDFLUSH_THREADS.
  * 
  * - If there have been no idle pdflush instances for 1 second, create
  *   a new one.
@@ -142,13 +134,14 @@ static int __pdflush(struct pdflush_work *my_work)
                  * To throttle creation, we reset last_empty_jifs.
                  */
                 if (time_after(jiffies, last_empty_jifs + 1 * HZ)) {
-                        if (list_empty(&pdflush_list) &&
-                            nr_pdflush_threads < nr_pdflush_threads_max) {
-                                last_empty_jifs = jiffies;
-                                nr_pdflush_threads++;
-                                spin_unlock_irq(&pdflush_lock);
-                                start_one_pdflush_thread();
-                                spin_lock_irq(&pdflush_lock);
+                        if (list_empty(&pdflush_list)) {
+                                if (nr_pdflush_threads < MAX_PDFLUSH_THREADS) {
+                                        last_empty_jifs = jiffies;
+                                        nr_pdflush_threads++;
+                                        spin_unlock_irq(&pdflush_lock);
+                                        start_one_pdflush_thread();
+                                        spin_lock_irq(&pdflush_lock);
+                                }
                         }
                 }
 
@@ -160,7 +153,7 @@ static int __pdflush(struct pdflush_work *my_work)
                  */
                 if (list_empty(&pdflush_list))
                         continue;
-                if (nr_pdflush_threads <= nr_pdflush_threads_min)
+                if (nr_pdflush_threads <= MIN_PDFLUSH_THREADS)
                         continue;
                 pdf = list_entry(pdflush_list.prev, struct pdflush_work, list);
                 if (time_after(jiffies, pdf->when_i_went_to_sleep + 1 * HZ)) {
@@ -266,9 +259,9 @@ static int __init pdflush_init(void)
          * Pre-set nr_pdflush_threads...  If we fail to create,
          * the count will be decremented.
          */
-        nr_pdflush_threads = nr_pdflush_threads_min;
+        nr_pdflush_threads = MIN_PDFLUSH_THREADS;
 
-        for (i = 0; i < nr_pdflush_threads_min; i++)
+        for (i = 0; i < MIN_PDFLUSH_THREADS; i++)
                 start_one_pdflush_thread();
         return 0;
 }