On Wed, Feb 7, 2018 at 5:51 PM, Matthias Kaehlcke <mka at chromium.org> wrote: > DML uses the compiler option -mpreferred-stack-boundary=4 to configure > a stack alignment of 16 bytes. Clang uses the option -mstack-alignment > instead, which expects as parameter the alignment in bytes, and not a > power of two like -mpreferred-stack-boundary. > > Probe for both compiler options and use the correct one, similar to > what is done in arch/x86/Makefile. > > Reported-by: Guenter Roeck <groeck at chromium.org> > Signed-off-by: Matthias Kaehlcke <mka at chromium.org> Reviewed-by: Guenter Roeck <groeck at chromium.org> Guenter > --- > Changes in v2: > - use consistent syntax and formatting for assignment of cc_stack_align > > drivers/gpu/drm/amd/display/dc/dml/Makefile | 8 +++++++- > 1 file changed, 7 insertions(+), 1 deletion(-) > > diff --git a/drivers/gpu/drm/amd/display/dc/dml/Makefile b/drivers/gpu/drm/amd/display/dc/dml/Makefile > index b8cadf833e71..a92189eddab0 100644 > --- a/drivers/gpu/drm/amd/display/dc/dml/Makefile > +++ b/drivers/gpu/drm/amd/display/dc/dml/Makefile > @@ -24,7 +24,13 @@ > # It provides the general basic services required by other DAL > # subcomponents. > > -subdir-ccflags-y += -mhard-float -msse -mpreferred-stack-boundary=4 > +ifneq ($(call cc-option, -mpreferred-stack-boundary=4),) > + cc_stack_align := -mpreferred-stack-boundary=4 > +else ifneq ($(call cc-option, -mstack-alignment=16),) > + cc_stack_align := -mstack-alignment=16 > +endif > + > +subdir-ccflags-y += -mhard-float -msse $(cc_stack_align) > > DML = display_mode_lib.o display_rq_dlg_calc.o \ > display_rq_dlg_helpers.o dml1_display_rq_dlg_calc.o \ > -- > 2.16.0.rc1.238.g530d649a79-goog >
