How do I do this???

"Find all real values of the parameter 𝑚 m such that the function 𝑦 = 𝑚 𝑥 3 − 2 𝑚 𝑥 2 + ( 𝑚 − 2 ) 𝑥 + 1 y=mx 3 −2mx 2 +(m−2)x+1 has no local extremum points"

i feel stupid for not being able to figure this out i really need help