1 files changed, 16 insertions, 14 deletions

diff --git a/block/ll_rw_blk.c b/block/ll_rw_blk.c
index 7eb36c53f4b7..5813d63c20af 100644
--- a/block/ll_rw_blk.c
+++ b/block/ll_rw_blk.c
@@ -10,7 +10,6 @@
 /*
  * This handles all read/write requests to block devices
  */
-#include <linux/config.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/backing-dev.h>
@@ -638,7 +637,7 @@ void blk_queue_bounce_limit(request_queue_t *q, u64 dma_addr)
         /* Assume anything <= 4GB can be handled by IOMMU.
            Actually some IOMMUs can handle everything, but I don't
            know of a way to test this here. */
-        if (bounce_pfn < (0xffffffff>>PAGE_SHIFT))
+        if (bounce_pfn < (min_t(u64,0xffffffff,BLK_BOUNCE_HIGH) >> PAGE_SHIFT))
                 dma = 1;
         q->bounce_pfn = max_low_pfn;
 #else
@@ -1663,6 +1662,8 @@ static void blk_unplug_timeout(unsigned long data)
  **/
 void blk_start_queue(request_queue_t *q)
 {
+        WARN_ON(!irqs_disabled());
+
         clear_bit(QUEUE_FLAG_STOPPED, &q->queue_flags);
 
         /*
@@ -1878,7 +1879,8 @@ EXPORT_SYMBOL(blk_alloc_queue_node);
  *    get dealt with eventually.
  *
  *    The queue spin lock must be held while manipulating the requests on the
- *    request queue.
+ *    request queue; this lock will be taken also from interrupt context, so irq
+ *    disabling is needed for it.
  *
  *    Function returns a pointer to the initialized request queue, or NULL if
  *    it didn't succeed.
@@ -2742,7 +2744,7 @@ static int attempt_merge(request_queue_t *q, struct request *req,
                 return 0;
 
         /*
-         * not contigious
+         * not contiguous
          */
         if (req->sector + req->nr_sectors != next->sector)
                 return 0;
@@ -2824,6 +2826,9 @@ static void init_request_from_bio(struct request *req, struct bio *bio)
         if (unlikely(bio_barrier(bio)))
                 req->flags |= (REQ_HARDBARRIER | REQ_NOMERGE);
 
+        if (bio_sync(bio))
+                req->flags |= REQ_RW_SYNC;
+
         req->errors = 0;
         req->hard_sector = req->sector = bio->bi_sector;
         req->hard_nr_sectors = req->nr_sectors = bio_sectors(bio);
@@ -3111,9 +3116,9 @@ void submit_bio(int rw, struct bio *bio)
         BIO_BUG_ON(!bio->bi_io_vec);
         bio->bi_rw |= rw;
         if (rw & WRITE)
-                mod_page_state(pgpgout, count);
+                count_vm_events(PGPGOUT, count);
         else
-                mod_page_state(pgpgin, count);
+                count_vm_events(PGPGIN, count);
 
         if (unlikely(block_dump)) {
                 char b[BDEVNAME_SIZE];
@@ -3359,12 +3364,11 @@ EXPORT_SYMBOL(end_that_request_chunk);
  */
 static void blk_done_softirq(struct softirq_action *h)
 {
-        struct list_head *cpu_list;
-        LIST_HEAD(local_list);
+        struct list_head *cpu_list, local_list;
 
         local_irq_disable();
         cpu_list = &__get_cpu_var(blk_cpu_done);
-        list_splice_init(cpu_list, &local_list);
+        list_replace_init(cpu_list, &local_list);
         local_irq_enable();
 
         while (!list_empty(&local_list)) {
@@ -3398,7 +3402,7 @@ static int blk_cpu_notify(struct notifier_block *self, unsigned long action,
 }
 
 
-static struct notifier_block blk_cpu_notifier = {
+static struct notifier_block __devinitdata blk_cpu_notifier = {
         .notifier_call  = blk_cpu_notify,
 };
 
@@ -3410,7 +3414,7 @@ static struct notifier_block blk_cpu_notifier = {
  *
  * Description:
  *     Ends all I/O on a request. It does not handle partial completions,
- *     unless the driver actually implements this in its completionc callback
+ *     unless the driver actually implements this in its completion callback
  *     through requeueing. Theh actual completion happens out-of-order,
  *     through a softirq handler. The user must have registered a completion
  *     callback through blk_queue_softirq_done().
@@ -3536,9 +3540,7 @@ int __init blk_dev_init(void)
                 INIT_LIST_HEAD(&per_cpu(blk_cpu_done, i));
 
         open_softirq(BLOCK_SOFTIRQ, blk_done_softirq, NULL);
-#ifdef CONFIG_HOTPLUG_CPU
-        register_cpu_notifier(&blk_cpu_notifier);
-#endif
+        register_hotcpu_notifier(&blk_cpu_notifier);
 
         blk_max_low_pfn = max_low_pfn;
         blk_max_pfn = max_pfn;