coredump: kill mm->core_done

Now that we have core_state->dumper list we can use it to wake up the
sub-threads waiting for the coredump completion.

This uglifies the code and .text grows by 47 bytes, but otoh mm_struct
lessens by sizeof(struct completion).  Also, with this change we can
decouple exit_mm() from the coredumping code.

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, 1 insertions, 3 deletions

diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h
index 4d0d0abc79fe..746f975b58ef 100644
--- a/include/linux/mm_types.h
+++ b/include/linux/mm_types.h
@@ -229,9 +229,7 @@ struct mm_struct {
 
         unsigned long flags; /* Must use atomic bitops to access the bits */
 
-        /* coredumping support */
-        struct core_state *core_state;
-        struct completion core_done;
+        struct core_state *core_state; /* coredumping support */
 
         /* aio bits */
         rwlock_t                ioctx_list_lock;        /* aio lock */