Hi all,

Today's linux-next merge of the amdgpu tree got conflicts in:

  drivers/gpu/drm/amd/display/dc/calcs/Makefile
  drivers/gpu/drm/amd/display/dc/dcn20/Makefile
  drivers/gpu/drm/amd/display/dc/dcn21/Makefile
  drivers/gpu/drm/amd/display/dc/dml/Makefile
  drivers/gpu/drm/amd/display/dc/dsc/Makefile

between commits:

  c868868f6b6a ("drm/amdgpu: fix stack alignment ABI mismatch for Clang")
  00db297106e8 ("drm/amdgpu: fix stack alignment ABI mismatch for GCC 7.1+")

from Linus' tree and commit:

  86462415d58d ("amdgpu: Enable initial DCN support on POWER")

from the amdgpu tree.

I fixed it up (I think .. see below) and can carry the fix as
necessary. This is now fixed as far as linux-next is concerned, but any
non trivial conflicts should be mentioned to your upstream maintainer
when your tree is submitted for merging.  You may also want to consider
cooperating with the maintainer of the conflicting tree to minimise any
particularly complex conflicts.

-- 
Cheers,
Stephen Rothwell

diff --cc drivers/gpu/drm/amd/display/dc/calcs/Makefile
index 26c6d735cdc7,4d3006bd4337..000000000000
--- a/drivers/gpu/drm/amd/display/dc/calcs/Makefile
+++ b/drivers/gpu/drm/amd/display/dc/calcs/Makefile
@@@ -24,22 -25,23 +25,30 @@@
  # It calculates Bandwidth and Watermarks values for HW programming
  #
  
 -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
++ifdef CONFIG_X86
 +calcs_ccflags := -mhard-float -msse
+ endif
+ 
 -ifdef CONFIG_X86
 -calcs_ccflags := -mhard-float -msse $(cc_stack_align)
++ifdef CONFIG_PPC64
++calcs_ccflags := -mhard-float -maltivec
++endif
  
 -ifdef CONFIG_CC_IS_CLANG
 -calcs_ccflags += -msse2
 +ifdef CONFIG_CC_IS_GCC
 +ifeq ($(call cc-ifversion, -lt, 0701, y), y)
 +IS_OLD_GCC = 1
  endif
  endif
  
 -ifdef CONFIG_PPC64
 -calcs_ccflags := -mhard-float -maltivec $(cc_stack_align)
 +ifdef IS_OLD_GCC
 +# Stack alignment mismatch, proceed with caution.
 +# GCC < 7.1 cannot compile code using `double` and -mpreferred-stack-boundary=3
 +# (8B stack alignment).
 +calcs_ccflags += -mpreferred-stack-boundary=4
 +else
++ifdef CONFIG_X86
 +calcs_ccflags += -msse2
 +endif
+ endif
  
  CFLAGS_$(AMDDALPATH)/dc/calcs/dcn_calcs.o := $(calcs_ccflags)
  CFLAGS_$(AMDDALPATH)/dc/calcs/dcn_calc_auto.o := $(calcs_ccflags)
diff --cc drivers/gpu/drm/amd/display/dc/dcn20/Makefile
index 63f3bddba7da,07f652d40f86..000000000000
--- a/drivers/gpu/drm/amd/display/dc/dcn20/Makefile
+++ b/drivers/gpu/drm/amd/display/dc/dcn20/Makefile
@@@ -6,26 -7,25 +7,32 @@@ DCN20 = dcn20_resource.o dcn20_init.o d
  		dcn20_stream_encoder.o dcn20_link_encoder.o dcn20_dccg.o \
  		dcn20_vmid.o dcn20_dwb.o dcn20_dwb_scl.o
  
- ifdef CONFIG_DRM_AMD_DC_DSC_SUPPORT
  DCN20 += dcn20_dsc.o
- endif
  
 -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
++ifdef CONFIG_X86
 +CFLAGS_$(AMDDALPATH)/dc/dcn20/dcn20_resource.o := -mhard-float -msse
+ endif
+ 
 -ifdef CONFIG_X86
 -CFLAGS_$(AMDDALPATH)/dc/dcn20/dcn20_resource.o := -mhard-float -msse $(cc_stack_align)
++ifdef CONFIG_PPC64
++CFLAGS_$(AMDDALPATH)/dc/dcn20/dcn20_resource.o := -mhard-float -maltivec
++endif
  
 -ifdef CONFIG_CC_IS_CLANG
 -CFLAGS_$(AMDDALPATH)/dc/dcn20/dcn20_resource.o += -msse2
 +ifdef CONFIG_CC_IS_GCC
 +ifeq ($(call cc-ifversion, -lt, 0701, y), y)
 +IS_OLD_GCC = 1
  endif
  endif
  
 -ifdef CONFIG_PPC64
 -CFLAGS_$(AMDDALPATH)/dc/dcn20/dcn20_resource.o := -mhard-float -maltivec $(cc_stack_align)
 +ifdef IS_OLD_GCC
 +# Stack alignment mismatch, proceed with caution.
 +# GCC < 7.1 cannot compile code using `double` and -mpreferred-stack-boundary=3
 +# (8B stack alignment).
 +CFLAGS_$(AMDDALPATH)/dc/dcn20/dcn20_resource.o += -mpreferred-stack-boundary=4
 +else
++ifdef CONFIG_X86
 +CFLAGS_$(AMDDALPATH)/dc/dcn20/dcn20_resource.o += -msse2
 +endif
+ endif
  
  AMD_DAL_DCN20 = $(addprefix $(AMDDALPATH)/dc/dcn20/,$(DCN20))
  
diff --cc drivers/gpu/drm/amd/display/dc/dcn21/Makefile
index 14113ccf498d,041464d001bd..000000000000
--- a/drivers/gpu/drm/amd/display/dc/dcn21/Makefile
+++ b/drivers/gpu/drm/amd/display/dc/dcn21/Makefile
@@@ -1,24 -2,26 +2,33 @@@
  #
  # Makefile for DCN21.
  
- DCN21 = dcn21_hubp.o dcn21_hubbub.o dcn21_resource.o dcn21_hwseq.o dcn21_link_encoder.o
+ DCN21 = dcn21_init.o dcn21_hubp.o dcn21_hubbub.o dcn21_resource.o \
+ 	 dcn21_hwseq.o dcn21_link_encoder.o
  
 -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
++ifdef CONFIG_X86
 +CFLAGS_$(AMDDALPATH)/dc/dcn21/dcn21_resource.o := -mhard-float -msse
+ endif
+ 
 -ifdef CONFIG_X86
 -CFLAGS_$(AMDDALPATH)/dc/dcn21/dcn21_resource.o := -mhard-float -msse $(cc_stack_align)
++ifdef CONFIG_PPC64
++CFLAGS_$(AMDDALPATH)/dc/dcn21/dcn21_resource.o := -mhard-float -maltivec
++endif
  
 -ifdef CONFIG_CC_IS_CLANG
 -CFLAGS_$(AMDDALPATH)/dc/dcn21/dcn21_resource.o += -msse2
 +ifdef CONFIG_CC_IS_GCC
 +ifeq ($(call cc-ifversion, -lt, 0701, y), y)
 +IS_OLD_GCC = 1
  endif
  endif
  
 -ifdef CONFIG_PPC64
 -CFLAGS_$(AMDDALPATH)/dc/dcn21/dcn21_resource.o := -mhard-float -maltivec $(cc_stack_align)
 +ifdef IS_OLD_GCC
 +# Stack alignment mismatch, proceed with caution.
 +# GCC < 7.1 cannot compile code using `double` and -mpreferred-stack-boundary=3
 +# (8B stack alignment).
 +CFLAGS_$(AMDDALPATH)/dc/dcn21/dcn21_resource.o += -mpreferred-stack-boundary=4
 +else
++ifdef CONFIG_X86
 +CFLAGS_$(AMDDALPATH)/dc/dcn21/dcn21_resource.o += -msse2
 +endif
+ endif
  
  AMD_DAL_DCN21 = $(addprefix $(AMDDALPATH)/dc/dcn21/,$(DCN21))
  
diff --cc drivers/gpu/drm/amd/display/dc/dml/Makefile
index 8df251626e22,82c8978c81ab..000000000000
--- a/drivers/gpu/drm/amd/display/dc/dml/Makefile
+++ b/drivers/gpu/drm/amd/display/dc/dml/Makefile
@@@ -24,22 -25,23 +25,30 @@@
  # It provides the general basic services required by other DAL
  # subcomponents.
  
 -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
++ifdef CONFIG_X86
 +dml_ccflags := -mhard-float -msse
+ endif
+ 
 -ifdef CONFIG_X86
 -dml_ccflags := -mhard-float -msse $(cc_stack_align)
++ifdef CONFIG_PPC64
++dml_ccflags := -mhard-float -maltivec
++endif
  
 -ifdef CONFIG_CC_IS_CLANG
 -dml_ccflags += -msse2
 +ifdef CONFIG_CC_IS_GCC
 +ifeq ($(call cc-ifversion, -lt, 0701, y), y)
 +IS_OLD_GCC = 1
  endif
  endif
  
 -ifdef CONFIG_PPC64
 -dml_ccflags := -mhard-float -maltivec $(cc_stack_align)
 +ifdef IS_OLD_GCC
 +# Stack alignment mismatch, proceed with caution.
 +# GCC < 7.1 cannot compile code using `double` and -mpreferred-stack-boundary=3
 +# (8B stack alignment).
 +dml_ccflags += -mpreferred-stack-boundary=4
 +else
++ifdef CONFIG_X86
 +dml_ccflags += -msse2
 +endif
+ endif
  
  CFLAGS_$(AMDDALPATH)/dc/dml/display_mode_lib.o := $(dml_ccflags)
  
diff --cc drivers/gpu/drm/amd/display/dc/dsc/Makefile
index 970737217e53,08edd919ec82..000000000000
--- a/drivers/gpu/drm/amd/display/dc/dsc/Makefile
+++ b/drivers/gpu/drm/amd/display/dc/dsc/Makefile
@@@ -1,22 -2,23 +2,30 @@@
  #
  # Makefile for the 'dsc' sub-component of DAL.
  
 -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
++ifdef CONFIG_X86
 +dsc_ccflags := -mhard-float -msse
+ endif
+ 
 -ifdef CONFIG_X86
 -dsc_ccflags := -mhard-float -msse $(cc_stack_align)
++ifdef CONFIG_PPC64
++dsc_ccflags := -mhard-float -maltivec
++endif
  
 -ifdef CONFIG_CC_IS_CLANG
 -dsc_ccflags += -msse2
 +ifdef CONFIG_CC_IS_GCC
 +ifeq ($(call cc-ifversion, -lt, 0701, y), y)
 +IS_OLD_GCC = 1
  endif
  endif
  
 -ifdef CONFIG_PPC64
 -dsc_ccflags := -mhard-float -maltivec $(cc_stack_align)
 +ifdef IS_OLD_GCC
 +# Stack alignment mismatch, proceed with caution.
 +# GCC < 7.1 cannot compile code using `double` and -mpreferred-stack-boundary=3
 +# (8B stack alignment).
 +dsc_ccflags += -mpreferred-stack-boundary=4
 +else
++ifdef CONFIG_X86
 +dsc_ccflags += -msse2
 +endif
+ endif
  
  CFLAGS_$(AMDDALPATH)/dc/dsc/rc_calc.o := $(dsc_ccflags)
  CFLAGS_$(AMDDALPATH)/dc/dsc/rc_calc_dpi.o := $(dsc_ccflags)