Basically DeNiro, THE WALL movie has the same plot as the album, which is this:

"The movie tells the story of rock singer "Pink" who is sitting in his hotel room in Los Angeles, burnt out from the music business and only able to perform on stage with the help of drugs. Based on the 1979 double album "The Wall" by Pink Floyd, the film begins in Pink's youth where he is crushed by the love of his mother."

"Several years later he is punished by the teachers in school because he is starting to write poems. Slowly he begins to build a wall around himself to be protected from the world outside. The film shows all this in massive and epic pictures until the very end where he tears down the wall and breaks free."

Now remember THE WALL movie had this ambition of telling a film without using expositional dialogue. Pretty much it tries to use visuals, editing, and of course THE WALL's music to tell its story, which is why it fustrates some viewers.

Still, if you dig Pink Floyd, or up for a very creative movie(and one that if I made a musical, I would be influenced mostly by THE WALL), check the movie out.