coredump: turn mm->core_startup_done into the pointer to struct core_state

mm->core_startup_done points to "struct completion startup_done" allocated
on the coredump_wait()'s stack.  Introduce the new structure, core_state,
which holds this "struct completion".  This way we can add more info
visible to the threads participating in coredump without enlarging
mm_struct.

No changes in affected .o files.

Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Cc: Roland McGrath <roland@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 4 insertions, 4 deletions

diff --git a/fs/exec.c b/fs/exec.c
index e347e6ed1617..71734568f018 100644
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -1597,13 +1597,13 @@ static int coredump_wait(int exit_code)
 {
         struct task_struct *tsk = current;
         struct mm_struct *mm = tsk->mm;
-        struct completion startup_done;
+        struct core_state core_state;
         struct completion *vfork_done;
         int core_waiters;
 
         init_completion(&mm->core_done);
-        init_completion(&startup_done);
-        mm->core_startup_done = &startup_done;
+        init_completion(&core_state.startup);
+        mm->core_state = &core_state;
 
         core_waiters = zap_threads(tsk, mm, exit_code);
         up_write(&mm->mmap_sem);
@@ -1622,7 +1622,7 @@ static int coredump_wait(int exit_code)
         }
 
         if (core_waiters)
-                wait_for_completion(&startup_done);
+                wait_for_completion(&core_state.startup);
 fail:
         BUG_ON(mm->core_waiters);
         return core_waiters;