X-Git-Url: http://ftp.safe.ca/?a=blobdiff_plain;f=mm%2Fbounce.c;h=a2b76a588e348e0d46f2bfed4131af6ac3eea86b;hb=79a56ed0e11c7d924762062a0e2a46b87014498d;hp=3b549bf31f7dc474996bf30a0401eea82b490466;hpb=6712ecf8f648118c3363c142196418f89a510b90;p=safe%2Fjmp%2Flinux-2.6

diff --git a/mm/bounce.c b/mm/bounce.c
index 3b549bf..a2b76a5 100644
--- a/mm/bounce.c
+++ b/mm/bounce.c
@@ -13,9 +13,10 @@
 #include <linux/init.h>
 #include <linux/hash.h>
 #include <linux/highmem.h>
-#include <linux/blktrace_api.h>
 #include <asm/tlbflush.h>
 
+#include <trace/events/block.h>
+
 #define POOL_SIZE	64
 #define ISA_POOL_SIZE	16
 
@@ -189,14 +190,19 @@ static void __blk_queue_bounce(struct request_queue *q, struct bio **bio_orig,
 		/*
 		 * is destination page below bounce pfn?
 		 */
-		if (page_to_pfn(page) <= q->bounce_pfn)
+		if (page_to_pfn(page) <= queue_bounce_pfn(q))
 			continue;
 
 		/*
 		 * irk, bounce it
 		 */
-		if (!bio)
-			bio = bio_alloc(GFP_NOIO, (*bio_orig)->bi_vcnt);
+		if (!bio) {
+			unsigned int cnt = (*bio_orig)->bi_vcnt;
+
+			bio = bio_alloc(GFP_NOIO, cnt);
+			memset(bio->bi_io_vec, 0, cnt * sizeof(struct bio_vec));
+		}
+			
 
 		to = bio->bi_io_vec + i;
 
@@ -222,7 +228,7 @@ static void __blk_queue_bounce(struct request_queue *q, struct bio **bio_orig,
 	if (!bio)
 		return;
 
-	blk_add_trace_bio(q, *bio_orig, BLK_TA_BOUNCE);
+	trace_block_bio_bounce(q, *bio_orig);
 
 	/*
 	 * at least one page was bounced, fill in possible non-highmem
@@ -265,12 +271,18 @@ void blk_queue_bounce(struct request_queue *q, struct bio **bio_orig)
 	mempool_t *pool;
 
 	/*
+	 * Data-less bio, nothing to bounce
+	 */
+	if (!bio_has_data(*bio_orig))
+		return;
+
+	/*
 	 * for non-isa bounce case, just check if the bounce pfn is equal
 	 * to or bigger than the highest pfn in the system -- in that case,
 	 * don't waste time iterating over bio segments
 	 */
 	if (!(q->bounce_gfp & GFP_DMA)) {
-		if (q->bounce_pfn >= blk_max_pfn)
+		if (queue_bounce_pfn(q) >= blk_max_pfn)
 			return;
 		pool = page_pool;
 	} else {