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Date: Thu, 26 Nov 2009 11:43:36 +0800
Message-ID: <3877989d0911251943j6860e88ci93e237ba65835bc7@mail.gmail.com>
Subject: ia64 lockdep: trying to register non-static key (mm->mmap_sem)
From: Luming Yu <luming.yu@gmail.com>
To: LKML <linux-kernel@vger.kernel.org>
Cc: "Luck, Tony" <tony.luck@intel.com>, Ingo Molnar <mingo@elte.hu>
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Anybody know how I should do to fix the lockdep
warning below, which is triggered in
ia64_brk doing "down_write(&mm->mmap_sem)"

Any comments are appreciated.


INFO: trying to register non-static key.
the code is fine but needs lockdep annotation.
turning off the locking correctness validator.

Call Trace:
 [<a000000100017330>] show_stack+0x70/0xc0
                                sp=e0000004807a7c50 bsp=e0000004807a1c78
 [<a0000001000173d0>] dump_stack+0x50/0x80
                                sp=e0000004807a7e20 bsp=e0000004807a1c58
 [<a0000001000f7ca0>] __lock_acquire+0x1a0/0x13e0
                                sp=e0000004807a7e20 bsp=e0000004807a1bc0
 [<a0000001000fc310>] lock_acquire+0x170/0x1e0
                                sp=e0000004807a7e20 bsp=e0000004807a1b60
 [<a0000001008338d0>] down_write+0x70/0x180
                                sp=e0000004807a7e20 bsp=e0000004807a1b28
 [<a00000010003b960>] ia64_brk+0x60/0x280
                                sp=e0000004807a7e20 bsp=e0000004807a1aa0
 [<a00000010000c620>] ia64_ret_from_syscall+0x0/0x20


Thanks,
Luming