On 2/15/24 15:13, Rick Edgecombe wrote: > The mm_struct contains a function pointer *get_unmapped_area(), which > is set to either arch_get_unmapped_area() or > arch_get_unmapped_area_topdown() during the initialization of the mm. > > Since the function pointer only ever points to two functions that are named > the same across all arch's, a function pointer is not really required. In > addition future changes will want to add versions of the functions that > take additional arguments. So to save a pointers worth of bytes in > mm_struct, and prevent adding additional function pointers to mm_struct in > future changes, remove it and keep the information about which > get_unmapped_area() to use in a flag. Indirect calls are just all kinds of evil, especially when Spectre-v2 is in play. This is a really good idea. Acked-by: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
