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, 1 deletions

diff --git a/kernel/fork.c b/kernel/fork.c
index 7e455a93a75a..125246fc75a5 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -1084,7 +1084,6 @@ static struct task_struct *copy_process(unsigned long clone_flags,
         p->security = NULL;
 #endif
         p->io_context = NULL;
-        p->io_wait = NULL;
         p->audit_context = NULL;
         cpuset_fork(p);
 #ifdef CONFIG_NUMA