kprobe on local function

[Nam Cao]

Hi,

I installed a kretprobe on the function "rt_mutex_slowunlock". Although the
function is called, the probe is never hit.

The reason is because there are 3 copies of rt_mutex_slowunlock() in
vmlinux (at least for x86 defconfig + CONFIG_PREEMPT_RT). But probe point
is only installed in 1 copy.

Is this considered a bug? Or is kprobe not intended to be used for local
function? Should we modify kprobe to support such cases?

Best regards,
Nam