From: Ingo Molnar <mingo@elte.hu>
To: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Linus Torvalds <torvalds@linux-foundation.org>,
linux-kernel <linux-kernel@vger.kernel.org>,
Prasanna S Panchamukhi <prasanna@in.ibm.com>,
Ananth N Mavinakayanahalli <ananth@in.ibm.com>,
Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>,
"David S. Miller" <davem@davemloft.net>
Subject: Re: [PATCH] lockdep: annotate kprobes irq fiddling
Date: Wed, 3 Oct 2007 12:52:21 +0200 [thread overview]
Message-ID: <20071003105221.GA6776@elte.hu> (raw)
In-Reply-To: <1191408172.5572.11.camel@lappy>
* Peter Zijlstra <a.p.zijlstra@chello.nl> wrote:
> Hi,
>
> The below patch fixes a lockdep error in 2.6.23-rc9 when using
> tcp_probe.
>
> ---
>
> Subject: lockdep: annotate kprobes irq fiddling
>
> kprobes disables irqs for jprobes, but does not tell lockdep about it.
this resolves this warning during an allyesconfig bzImage bootup test:
[ 423.670337] WARNING: at kernel/lockdep.c:2658 check_flags()
[ 423.670341] [<c0107f01>] show_trace_log_lvl+0x19/0x2e
[ 423.670348] [<c0107ffa>] show_trace+0x12/0x14
[ 423.670350] [<c0108010>] dump_stack+0x14/0x16
[ 423.670353] [<c015249d>] check_flags+0x95/0x142
[ 423.670357] [<c0155576>] lock_acquire+0x52/0xb8
[ 423.670360] [<c1313c90>] _spin_lock+0x2e/0x58
[ 423.670365] [<c11b72f9>] jtcp_rcv_established+0x6e/0x189
[ 423.670369] [<c11810da>] tcp_v4_do_rcv+0x30b/0x620
[ 423.670373] [<c1181c8c>] tcp_v4_rcv+0x89d/0x8fa
[ 423.670376] [<c1167dba>] ip_local_deliver+0x17d/0x225
[ 423.670380] [<c11682f5>] ip_rcv+0x493/0x4ce
[ 423.670383] [<c11177ef>] netif_receive_skb+0x347/0x365
[ 423.670388] [<c07b6e7b>] nv_napi_poll+0x501/0x6c3
[ 423.670393] [<c1115b1a>] net_rx_action+0xa3/0x1b6
[ 423.670396] [<c013bdee>] __do_softirq+0x76/0xfb
[ 423.670400] [<c0109189>] do_softirq+0x75/0xf3
Ingo
prev parent reply other threads:[~2007-10-03 10:52 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-10-03 10:42 [PATCH] lockdep: annotate kprobes irq fiddling Peter Zijlstra
2007-10-03 10:52 ` Ingo Molnar [this message]
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