task_struct cleanup: move binfmt field to mm_struct

Because the binfmt is not different between threads in the same process,
it can be moved from task_struct to mm_struct.  And binfmt moudle is
handled per mm_struct instead of task_struct.

Signed-off-by: Hiroshi Shimamoto <h-shimamoto@ct.jp.nec.com>
Acked-by: Oleg Nesterov <oleg@redhat.com>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Acked-by: Roland McGrath <roland@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

2 files changed, 2 insertions, 1 deletions

diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h
index 6b7029ab9c8e..21d6aa45206a 100644
--- a/include/linux/mm_types.h
+++ b/include/linux/mm_types.h
@@ -240,6 +240,8 @@ struct mm_struct {
 
         unsigned long saved_auxv[AT_VECTOR_SIZE]; /* for /proc/PID/auxv */
 
+        struct linux_binfmt *binfmt;
+
         cpumask_t cpu_vm_mask;
 
         /* Architecture-specific MM context */
diff --git a/include/linux/sched.h b/include/linux/sched.h
index 811cd96524d7..8a16f6d11dcd 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -1271,7 +1271,6 @@ struct task_struct {
         struct mm_struct *mm, *active_mm;
 
 /* task state */
-        struct linux_binfmt *binfmt;
         int exit_state;
         int exit_code, exit_signal;
         int pdeath_signal;  /*  The signal sent when the parent dies  */