On Fri, Feb 1, 2019 at 9:13 AM Thomas Garnier <thgarnie@xxxxxxxxxxxx> wrote: > > On Thu, Jan 31, 2019 at 6:31 PM Christopher Lameter <cl@xxxxxxxxx> wrote: > > > > On Thu, 31 Jan 2019, Thomas Garnier wrote: > > > > > The per-cpu symbols are in a section that is zero based to create > > > offsets. The compiler doesn't see them as offsets but as relative > > > symbol and try to relocate them. Given the distance between zero and > > > the mapped kernel is much larger than the instruction offset range, it > > > fails to do it. > > > > We switch that off in the linker. If that does not work with your > > modifications then you need to figure out how to update the link > > configuration. > > > > It didn't work originally but I will revisit to see if I missed something. I revisited and couldn't find a way to prevent relocations to the percpu section. Without PIE, you can reference absolute address which was convenient for percpu. Christopher: Did you have something specific in mind? I checked the following: - Changing the FLAGS() on the PHDRS. - using -z noreloc-overflow which actually doesn't seem to apply to PC32 relocations. - Look at all linker options and script format for anything around that.
