On Tue, 2009-02-03 at 21:59 +0300, Anton Vorontsov wrote: > On Tue, Feb 03, 2009 at 11:32:18AM -0500, Steven Rostedt wrote: > > > > On Tue, 2009-02-03 at 19:19 +0300, Anton Vorontsov wrote: > > > On Tue, Feb 03, 2009 at 05:06:45PM +0100, Ingo Molnar wrote: > > > > > [1] Btw, why exactly do we need the -fno-omit-frame-pointer for > > > "FUNCTION_TRCER" tracer? Why just -pg isn't sufficient?.. > > > > > > > The problem is this that is in the toplevel Makefile: > > > > > > ifdef CONFIG_FRAME_POINTER > > KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls > > else > > KBUILD_CFLAGS += -fomit-frame-pointer > > endif > >
And don't forget the gcc bug that miscompiles function epilogues on ppc with -fno-omit-frame-pointer (iirc), which we need to work around using -mno-sched-epilog. Currently, we set that only if CONFIG_FUNCTION_TRACER is set, ie, we assume that we only set -fno-omit-frame-pointer when CONFIG_FUNCTION_TRACER is set. Ben. _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-dev
