What area does hip roll lipo treat?

I usually recommend liposuction of the flank area (hip roll or love handles) at the same time as an abdominoplasty. In order to achieve a harmonious result after a tummy tuck, most patients would benefit from contouring the continuation between the abdomen and the back -- the flanks. Whereas some patients do not need this because they are so thin, this represents less than 10% of tummy tuck candidates in my experience. When you look at your post tummy tuck results, you want a flat abdomen with smooth flanks - not bulging or fullness in these areas; liposuction helps to achieve that result.

lipo should be done 360 degrees including full torso and back and then use t he fat to shape the hip and buttock, that is what hip-dip treatment is. Please see an expert.
You need a formal evaluation by an expert in body shaping and contouring to determine what is best.  Traditional liposuction awake and smart liposuction are old methods and do very poorly for tightening skin or significant skin tightening or contouring.  Small problem areas can be improved slightly by these methods.  The best in body contouring not only removes fat with energy devices like VASER ultrasound but also internally heat the skin with radio-frequency devices such as J PLASMA/RENUVION, InMode BodyTite, ThermiRF to heat the under surface of the skin and tighten it at the same time as fat removal. These combinations are called 4D HIDEF VASER contouring and can only be done by a well . trained body contouring specialist. At the same time fat should be harvested, PRP and stem cells added and injected into muscles or indentations/cellulite to get body shaping and contouring.  This is known as a Brazilian butt lift when you inject the fat to the buttock for contouring and lifting, but fat can also be used in areas such as the chest/breast, arms/shoulders, calves and face.  Cellulite should also be treated with cellfina, sculptra, subcision and/or fillers such as bellafill, renuva synthetic fat, or sculptra.  If skin is very loose before surgery then it will need to be removed such as lower abdominal skin (tummy tuck/abdominoplasty), breast skin (breast lift), arm skin (brachioplasty).  Overall you need a full assessment, but simple liposuction alone will not tighten skin and needs a combination of various methods -- fat removal, skin tightening, defining, fat grafting, skin removal -- to get the best in body contouring and body sculpting.  Dr. Emer.

Some patients have marked fatty deposits in the hip and waist area that cannot be address by just a tummy tuck. for a excellent result most of the time i do liposuction of the hip roll together with the tummy tuck

The term hip is used differently by different people. It is not a good term in my opinion. I suggest reviewing this with your provider to see what their interpretation is of what’s included in the hip roll.
Even though hip may be more medically appropriate I find terms like love handles and waist  to be more universally understood.
Please discuss with your provider.
Best,
Mats Hagstrom MD

A tummy tuck is often accompanied by liposuction of areas such as the back, flanks (hips), abdomen, and thighs. This helps improve both your overall aesthetic and the results of the tummy tuck, as long as it is done correctly.  The Gold Standard for superior liposuction results requires use of the advanced technology of ultrasound assisted VASER liposuction. As an official trainer of VASER liposuction, I perform full body liposuction cases every week. VASER liposuction has been the only modality that has consistently resulted in outstanding liposuction outcomes. VASER liposuction ensures a smooth contour regardless of degree of excess fat by virtue of being able to remove any and all remaining fat comprehensively and uniformly. If skin redundancy is observed, Renuvion technology can be simultaneously applied to tighten your skin to optimize your overall contour outcome. A Skype or FaceTime consultation with a VASER specialist will help you get an accurate recommendation and pricing.
Respectfully, 
Arian Mowlavi MD, FACS
Realself 100 Hall of Fame Inductee