Andy Chiu <[email protected]> writes: > We are changing ftrace code patching in order to remove dependency from > stop_machine() and enable kernel preemption. This requires us to align > functions entry at a 4-B align address. > > However, -falign-functions on older versions of GCC alone was not strong > enoungh to align all functions. In fact, cold functions are not aligned > after turning on optimizations. We consider this is a bug in GCC and > turn off guess-branch-probility as a workaround to align all functions. > > GCC bug id: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88345 > > The option -fmin-function-alignment is able to align all functions > properly on newer versions of gcc. So, we add a cc-option to test if > the toolchain supports it. > > Suggested-by: Evgenii Shatokhin <[email protected]> > Signed-off-by: Andy Chiu <[email protected]>
Reviewed-by: Björn Töpel <[email protected]>
