[PATCH] task_struct: ifdef btrace_seq

[Alexey Dobriyan]

Debugging aid.

Signed-off-by: Alexey Dobriyan <adobriyan@xxxxxxxxx>
---

 include/linux/sched.h |    2 ++
 kernel/fork.c         |    2 ++
 2 files changed, 4 insertions(+)

--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -784,7 +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;
--- 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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