Seen in my linux-next dmesg. I'm suspecting commit ac07b1ffc:
commit ac07b1ffc27d575013041fb5277dab02c661d9c2
Author: Shaohua Li <shli@xxxxxxxxxx>
Date: Thu Jan 24 13:13:50 2013 +1100
swap: add per-partition lock for swapfile
as (a) it was OK in -20130117, and (b) 'git blame mm/swapfile.c | grep 2013'
shows that commit as the vast majority of changes.
[ 42.498669] INFO: trying to register non-static key.
[ 42.498670] the code is fine but needs lockdep annotation.
[ 42.498671] turning off the locking correctness validator.
[ 42.498674] Pid: 1035, comm: swapon Not tainted 3.8.0-rc5-next-20130128 #52
[ 42.498675] Call Trace:
[ 42.498681] [<ffffffff81073dc8>] register_lock_class+0x103/0x2ad
[ 42.498685] [<ffffffff812493ad>] ? __list_add_rcu+0xc4/0xdf
[ 42.498688] [<ffffffff81075573>] __lock_acquire+0x108/0xd63
[ 42.498691] [<ffffffff810b482b>] ? trace_preempt_on+0x12/0x2f
[ 42.498695] [<ffffffff81608e6e>] ? sub_preempt_count+0x31/0x43
[ 42.498699] [<ffffffff810fda36>] ? sys_swapon+0x6f9/0x9d9
[ 42.498701] [<ffffffff810764f2>] lock_acquire+0xc7/0x14a
[ 42.498703] [<ffffffff810fda62>] ? sys_swapon+0x725/0x9d9
[ 42.498706] [<ffffffff81605023>] _raw_spin_lock+0x34/0x41
[ 42.498708] [<ffffffff810fda62>] ? sys_swapon+0x725/0x9d9
[ 42.498710] [<ffffffff810fda62>] sys_swapon+0x725/0x9d9
[ 42.498712] [<ffffffff8107520a>] ? trace_hardirqs_on_caller+0x149/0x165
[ 42.498715] [<ffffffff8160be92>] system_call_fastpath+0x16/0x1b
[ 42.498719] Adding 2097148k swap on /dev/mapper/vg_blackice-swap. Priority:-1 extents:1 across:2097148k
Somebody care to sprinkle the appropriate annotations on that code?
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