Remove struct task_struct::io_wait

Hell knows what happened in commit 63b05203af57e7de4f3bb63b8b81d43bc196d32b
during 2.6.9 development.  Commit introduced io_wait field which remained
write-only than and still remains write-only.

Also garbage collect macros which "use" io_wait.

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 0 insertions, 7 deletions

diff --git a/include/linux/sched.h b/include/linux/sched.h
index c204ab0d4df1..269b234609b8 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -1110,13 +1110,6 @@ struct task_struct {
 
         unsigned long ptrace_message;
         siginfo_t *last_siginfo; /* For ptrace use.  */
-/*
- * current io wait handle: wait queue entry to use for io waits
- * If this thread is processing aio, this points at the waitqueue
- * inside the currently handled kiocb. It may be NULL (i.e. default
- * to a stack based synchronous wait) if its doing sync IO.
- */
-        wait_queue_t *io_wait;
 #ifdef CONFIG_TASK_XACCT
 /* i/o counters(bytes read/written, #syscalls */
         u64 rchar, wchar, syscr, syscw;