[PATCH v3] ifdef blktrace debugging fields

[Alexey Dobriyan <adobriyan@gmail.com>]

On Tue, Aug 01, 2006 at 10:12:57PM +0200, Jens Axboe wrote:
> > +#ifdef CONFIG_BLK_DEV_IO_TRACE
> >  	if (q->blk_trace)
> >  		blk_trace_shutdown(q);
> > -
> > +#endif
> >  	kmem_cache_free(requestq_cachep, q);
> >  }
>
> That can be made ifdef less, if you unconditionally call
> blk_trace_shutdown() and just make that one do:
>
>         if (q->blk_trace) {
>                 ...
>         }
>
> since that'll then do the right always. Please make that change, then
> I'm fine with the patch.

OK here goes version 3.

[PATCH] ifdef blktrace debugging fields

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
---

 block/blktrace.c       |    6 ++++--
 block/ll_rw_blk.c      |    3 +--
 include/linux/blkdev.h |    4 ++--
 include/linux/sched.h  |    3 ++-
 kernel/fork.c          |    2 ++
 5 files changed, 11 insertions(+), 7 deletions(-)

--- a/block/blktrace.c
+++ b/block/blktrace.c
@@ -450,8 +450,10 @@ int blk_trace_ioctl(struct block_device
  **/
 void blk_trace_shutdown(request_queue_t *q)
 {
-	blk_trace_startstop(q, 0);
-	blk_trace_remove(q);
+	if (q->blk_trace) {
+		blk_trace_startstop(q, 0);
+		blk_trace_remove(q);
+	}
 }
 
 /*
--- a/block/ll_rw_blk.c
+++ b/block/ll_rw_blk.c
@@ -1780,8 +1780,7 @@ static void blk_release_queue(struct kob
 	if (q->queue_tags)
 		__blk_queue_free_tags(q);
 
-	if (q->blk_trace)
-		blk_trace_shutdown(q);
+	blk_trace_shutdown(q);
 
 	kmem_cache_free(requestq_cachep, q);
 }
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -417,9 +417,9 @@ struct request_queue
 	unsigned int		sg_timeout;
 	unsigned int		sg_reserved_size;
 	int			node;
-
+#ifdef CONFIG_BLK_DEV_IO_TRACE
 	struct blk_trace	*blk_trace;
-
+#endif
 	/*
 	 * reserved for flush operations
 	 */
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -784,8 +784,9 @@ #endif
 	struct prio_array *array;
 
 	unsigned short ioprio;
+#ifdef CONFIG_BLK_DEV_IO_TRACE
 	unsigned int btrace_seq;
-
+#endif
 	unsigned long sleep_avg;
 	unsigned long long timestamp, last_ran;
 	unsigned long long sched_time; /* sched_clock time spent running */
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -177,7 +177,9 @@ static struct task_struct *dup_task_stru
 	/* One for us, one for whoever does the "release_task()" (usually parent) */
 	atomic_set(&tsk->usage,2);
 	atomic_set(&tsk->fs_excl, 0);
+#ifdef CONFIG_BLK_DEV_IO_TRACE
 	tsk->btrace_seq = 0;
+#endif
 	tsk->splice_pipe = NULL;
 	return tsk;
 }

-
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