mm: change mm_update_next_owner() to update mm->owner with WRITE_ONCE
authorAndrea Arcangeli <aarcange@redhat.com>
Tue, 14 May 2019 22:40:50 +0000 (15:40 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Wed, 15 May 2019 02:52:47 +0000 (19:52 -0700)
commit987717e5e016a0dd3011d3bb16546672713f94e2
treefa83028052001ed851507f8a42b241ba45212b20
parentc3f3ce049f7d97cc7ec9c01cb51d9ec74e0f37c2
mm: change mm_update_next_owner() to update mm->owner with WRITE_ONCE

The RCU reader uses rcu_dereference() inside rcu_read_lock critical
sections, so the writer shall use WRITE_ONCE.  Just a cleanup, we still
rely on gcc to emit atomic writes in other places.

Link: http://lkml.kernel.org/r/20190325225636.11635-3-aarcange@redhat.com
Signed-off-by: Andrea Arcangeli <aarcange@redhat.com>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Hugh Dickins <hughd@google.com>
Cc: Jann Horn <jannh@google.com>
Cc: Jason Gunthorpe <jgg@mellanox.com>
Cc: "Kirill A . Shutemov" <kirill.shutemov@linux.intel.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Mike Rapoport <rppt@linux.vnet.ibm.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Xu <peterx@redhat.com>
Cc: zhong jiang <zhongjiang@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
kernel/exit.c