/******************************************************************************
*******************************************************************************
**
** Copyright (C) 2005-2011 Red Hat, Inc. All rights reserved.
**
** This copyrighted material is made available to anyone wishing to use,
** modify, copy, or redistribute it subject to the terms and conditions
** of the GNU General Public License v.2.
**
*******************************************************************************
******************************************************************************/
#ifndef __MEMBER_DOT_H__
#define __MEMBER_DOT_H__
int dlm_ls_stop(struct dlm_ls *ls);
int dlm_ls_start(struct dlm_ls *ls);
void dlm_clear_members(struct dlm_ls *ls);
void dlm_clear_members_gone(struct dlm_ls *ls);
int dlm_recover_members(struct dlm_ls *ls, struct dlm_recover *rv,int *neg_out);
int dlm_is_removed(struct dlm_ls *ls, int nodeid);
int dlm_is_member(struct dlm_ls *ls, int nodeid);
int dlm_slots_version(struct dlm_header *h);
void dlm_slot_save(struct dlm_ls *ls, struct dlm_rcom *rc,
struct dlm_member *memb);
void dlm_slots_copy_out(struct dlm_ls *ls, struct dlm_rcom *rc);
int dlm_slots_copy_in(struct dlm_ls *ls);
int dlm_slots_assign(struct dlm_ls *ls, int *num_slots, int *slots_size,
struct dlm_slot **slots_out, uint32_t *gen_out);
void dlm_lsop_recover_done(struct dlm_ls *ls);
#endif /* __MEMBER_DOT_H__ */
'>Tobias Klauser
pid: fix lockdep deadlock warning due to ucount_lock
=========================================================
[ INFO: possible irq lock inversion dependency detected ]
4.10.0-rc2-00024-g4aecec9-dirty #118 Tainted: G W
---------------------------------------------------------
swapper/1/0 just changed the state of lock:
(&(&sighand->siglock)->rlock){-.....}, at: [<ffffffffbd0a1bc6>] __lock_task_sighand+0xb6/0x2c0
but this lock took another, HARDIRQ-unsafe lock in the past:
(ucounts_lock){+.+...}
and interrupts could create inverse lock ordering between them.
other info that might help us debug this:
Chain exists of: &(&sighand->siglock)->rlock --> &(&tty->ctrl_lock)->rlock --> ucounts_lock
Possible interrupt unsafe locking scenario:
CPU0 CPU1
---- ----
lock(ucounts_lock);
local_irq_disable();
lock(&(&sighand->siglock)->rlock);
lock(&(&tty->ctrl_lock)->rlock);
<Interrupt>
lock(&(&sighand->siglock)->rlock);
*** DEADLOCK ***
This patch removes a dependency between rlock and ucount_lock.
Fixes: f333c700c610 ("pidns: Add a limit on the number of pid namespaces")
Cc: stable@vger.kernel.org
Signed-off-by: Andrei Vagin <avagin@openvz.org>
Acked-by: Al Viro <viro@ZenIV.linux.org.uk>
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>