From: Andrea Arcangeli <andrea-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
To: Christoph Lameter <clameter-sJ/iWh9BUns@public.gmane.org>
Cc: Nick Piggin <npiggin-l3A5Bk7waGM@public.gmane.org>,
Peter Zijlstra
<a.p.zijlstra-/NLkJaSkS4VmR6Xm/wNWPw@public.gmane.org>,
linux-mm-Bw31MaZKKs3YtjvyW6yDsg@public.gmane.org,
Benjamin Herrenschmidt
<benh-XVmvHMARGAS8U2dJNN8I7kB+6BGkLq7r@public.gmane.org>,
steiner-sJ/iWh9BUns@public.gmane.org,
linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
Avi Kivity <avi-atKUWr5tajBWk0Htik3J/w@public.gmane.org>,
kvm-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org,
daniel.blueman-xqY44rlHlBpWk0Htik3J/w@public.gmane.org,
Robin Holt <holt-sJ/iWh9BUns@public.gmane.org>,
Hugh Dickins <hugh-DTz5qymZ9yRBDgjK7y7TUQ@public.gmane.org>
Subject: Re: [patch 1/6] mmu_notifier: Core code
Date: Wed, 30 Jan 2008 16:37:49 +0100 [thread overview]
Message-ID: <20080130153749.GN7233@v2.random> (raw)
In-Reply-To: <20080130022944.236370194-sJ/iWh9BUns@public.gmane.org>
On Tue, Jan 29, 2008 at 06:29:10PM -0800, Christoph Lameter wrote:
> +void mmu_notifier_release(struct mm_struct *mm)
> +{
> + struct mmu_notifier *mn;
> + struct hlist_node *n, *t;
> +
> + if (unlikely(!hlist_empty(&mm->mmu_notifier.head))) {
> + rcu_read_lock();
> + hlist_for_each_entry_safe_rcu(mn, n, t,
> + &mm->mmu_notifier.head, hlist) {
> + hlist_del_rcu(&mn->hlist);
This will race and kernel crash against mmu_notifier_register in
SMP. You should resurrect the per-mmu_notifier_head lock in my last
patch (except it can be converted from a rwlock_t to a regular
spinlock_t) and drop the mmap_sem from
mmu_notifier_register/unregister.
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next prev parent reply other threads:[~2008-01-30 15:37 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-01-30 2:29 [patch 0/6] [RFC] MMU Notifiers V3 Christoph Lameter
2008-01-30 2:29 ` [patch 1/6] mmu_notifier: Core code Christoph Lameter
[not found] ` <20080130022944.236370194-sJ/iWh9BUns@public.gmane.org>
2008-01-30 15:37 ` Andrea Arcangeli [this message]
[not found] ` <20080130153749.GN7233-lysg2Xt5kKMAvxtiuMwx3w@public.gmane.org>
2008-01-30 15:53 ` Jack Steiner
[not found] ` <20080130155306.GA13746-sJ/iWh9BUns@public.gmane.org>
2008-01-30 16:38 ` Andrea Arcangeli
2008-01-30 19:19 ` Christoph Lameter
[not found] ` <Pine.LNX.4.64.0801301116510.27491-RYO/mD75kfhx2SFC9UQUAuF7EQX82lMiAL8bYrjMMd8@public.gmane.org>
2008-01-30 22:20 ` Robin Holt
[not found] ` <20080130222035.GX26420-sJ/iWh9BUns@public.gmane.org>
2008-01-30 23:38 ` Andrea Arcangeli
2008-01-30 23:55 ` Christoph Lameter
[not found] ` <Pine.LNX.4.64.0801301552210.1722-RYO/mD75kfhx2SFC9UQUAuF7EQX82lMiAL8bYrjMMd8@public.gmane.org>
2008-01-31 0:12 ` Andrea Arcangeli
[not found] ` <20080131001258.GD7185-lysg2Xt5kKMAvxtiuMwx3w@public.gmane.org>
2008-01-31 1:27 ` Christoph Lameter
2008-01-30 17:10 ` Peter Zijlstra
2008-01-30 19:28 ` Christoph Lameter
2008-01-30 18:02 ` Robin Holt
[not found] ` <20080130180207.GU26420-sJ/iWh9BUns@public.gmane.org>
2008-01-30 19:08 ` Christoph Lameter
2008-01-30 19:14 ` Christoph Lameter
2008-01-30 2:29 ` [patch 2/6] mmu_notifier: Callbacks to invalidate address ranges Christoph Lameter
2008-01-30 2:29 ` [patch 3/6] mmu_notifier: invalidate_page callbacks for subsystems with rmap Christoph Lameter
[not found] ` <20080130022944.699753910-sJ/iWh9BUns@public.gmane.org>
2008-01-30 18:03 ` Robin Holt
2008-01-30 2:29 ` [patch 4/6] MMU notifier: invalidate_page callbacks using Linux rmaps Christoph Lameter
2008-01-30 2:29 ` [patch 5/6] mmu_notifier: Callbacks for xip_filemap.c Christoph Lameter
2008-01-30 2:29 ` [patch 6/6] mmu_notifier: Add invalidate_all() Christoph Lameter
-- strict thread matches above, loose matches on Subject: below --
2008-02-15 6:48 [ofa-general] [patch 0/6] MMU Notifiers V7 Christoph Lameter
2008-02-15 6:49 ` [patch 1/6] mmu_notifier: Core code Christoph Lameter
2008-02-16 3:37 ` [ofa-general] " Andrew Morton
2008-02-16 8:45 ` Avi Kivity
2008-02-16 8:56 ` [ofa-general] " Andrew Morton
2008-02-16 9:21 ` Avi Kivity
2008-02-16 19:21 ` [ofa-general] " Christoph Lameter
2008-02-17 3:01 ` Andrea Arcangeli
2008-02-17 12:24 ` Robin Holt
2008-02-17 5:04 ` Doug Maxey
2008-02-08 22:06 [patch 0/6] MMU Notifiers V6 Christoph Lameter
2008-02-08 22:06 ` [patch 1/6] mmu_notifier: Core code Christoph Lameter
2008-01-28 20:28 [patch 0/6] [RFC] MMU Notifiers V2 Christoph Lameter
2008-01-28 20:28 ` [patch 1/6] mmu_notifier: Core code Christoph Lameter
[not found] ` <20080128202923.609249585-sJ/iWh9BUns@public.gmane.org>
2008-01-28 22:06 ` Christoph Lameter
2008-01-29 0:05 ` Robin Holt
[not found] ` <20080129000534.GT3058-sJ/iWh9BUns@public.gmane.org>
2008-01-29 1:19 ` Christoph Lameter
2008-01-29 13:59 ` Andrea Arcangeli
[not found] ` <20080129135914.GF7233-lysg2Xt5kKMAvxtiuMwx3w@public.gmane.org>
2008-01-29 14:34 ` Andrea Arcangeli
2008-01-29 19:49 ` Christoph Lameter
[not found] ` <Pine.LNX.4.64.0801291148080.24807-RYO/mD75kfhx2SFC9UQUAuF7EQX82lMiAL8bYrjMMd8@public.gmane.org>
2008-01-29 20:41 ` Avi Kivity
2008-01-29 16:07 ` Robin Holt
2008-02-05 18:05 ` Andy Whitcroft
2008-02-05 18:17 ` Peter Zijlstra
[not found] ` <20080205180557.GC29502-26w3C0LaAnFg9hUCZPvPmw@public.gmane.org>
2008-02-05 18:19 ` Christoph Lameter
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