registration error (rc -22) on a standard function. Why ?

[Breno Leitao <leitao@linux.vnet.ibm.com>]

Hi, 

I am trying to probe a function which was static and inline. To probe
it, I remove the static and inline modifier, to turn into a standard
function, but now I am getting the following error: 

WARNING: probe module("bonding").function("_lock_tx_hashtbl@drivers/net/bonding/bond_alb.c:132") registration error (rc -22)

Here is the function:

void _lock_tx_hashtbl(struct bonding *bond)
{
        spin_lock_bh(&(BOND_ALB_INFO(bond).tx_hashtbl_lock));
}

stap -p2 shows: 

module("bonding").function("_lock_tx_hashtbl@drivers/net/bonding/bond_alb.c:132") /* pc=.text+0x9b00 */ /* <- module("bonding").function("_lock_tx_hashtbl") */


Objdump shows: 

0000000000009b00 <._lock_tx_hashtbl>:
    9b00:       7c 08 02 a6     mflr    r0
    9b04:       38 63 01 f0     addi    r3,r3,496
    9b08:       f8 01 00 10     std     r0,16(r1)
    9b0c:       f8 21 ff 91     stdu    r1,-112(r1)
    9b10:       48 00 00 01     bl      9b10 <._lock_tx_hashtbl+0x10>
                        9b10: R_PPC64_REL24     ._spin_lock_bh
    9b14:       60 00 00 00     nop
    9b18:       38 21 00 70     addi    r1,r1,112
    9b1c:       e8 01 00 10     ld      r0,16(r1)
    9b20:       7c 08 03 a6     mtlr    r0
    9b24:       4e 80 00 20     blr


I really didn't understand why I can't probe that function. Any idea 
what might be wrong ?

Thanks
Breno