Ifvarsson was from centrala soldatregistret. Now I checked the military books myself, and I'm not so sure anymore. Ola Malm had 6 years in the military in 1818, so he was recruited in 1812 when this regiment was started. He was representing the farm Stora (large) Ebbarp.
In 1812, there is a man called Ola Ifversson representing Lilla Ebbarp. Same man? Problem is, he was just 17 years in 1812, and 29 in 1818. Also he was 5 foot tall in 1812, and 5 foot 8 inches in 1818. The regiment was just started in 1812, so they might have been in a hurry and got some info wrong. For example, no soldiers had got any soldiers last names yet, they all had their patronymicon.
That book I only found at Arkiv Digital, a pay service. If you have it, you can see it here: https://app.arkivdigital.se/volume/v731062a?image=70
If you trace him in the Onsjö kompani from 1818 to 1843 (found here: https://sok.riksarkivet.se/generalmonsterrullor?RegementeIndex=Norra+Sk%C3%A5nska+infanteriregementet&KompaniIndex=Onsj%C3%B6+kompani&DatumFran=&DatumTill= ), his residence in each record is Stora Ebbarp, his height varies from 5' 8" to 5' 11", his birthplace is Bohuslän, and--interestingly--his birthdate is 1788/1789, and not the 11 Nov. 1795 that appears in the Husförhörslängder.
If this is the same Ola Malm, perhaps his birthplace remains hidden because his actual birth year is 1788 or 1789?