On Tue, Sep 25, 2018 at 11:20 PM Stefan Agner <[email protected]> wrote: > > While in theory multiple unwinders could be compiled in, it does > not make sense in practise. Use a choice to make the unwinder > selection mutually exclusive and mandatory. > > Already before this commit it has not been possible to deselect > FRAME_POINTER. Remove the obsolete comment. > > Furthermore, to produce a meaningful backtrace with FRAME_POINTER > enabled the kernel needs a specific function prologue: > mov ip, sp > stmfd sp!, {fp, ip, lr, pc} > sub fp, ip, #4 > > To get to the required prologue gcc uses apcs and no-sched-prolog. > This compiler options are not available on clang, and clang is not > able to generate the required prologue. Make the FRAME_POINTER > config symbol depending on !clang. > > Suggested-by: Arnd Bergmann <[email protected]> > Signed-off-by: Stefan Agner <[email protected]>
Reviewed-by: Arnd Bergmann <[email protected]> I've tested an earlier version of this patch on my randconfig builder without issues. Arnd
