[PATCH] powerpc/64e: Fix amdgpu build on Book3E w/o AltiVec

[Michael Ellerman]

There's a build failure for Book3E without AltiVec:
  Error: cc1: error: AltiVec not supported in this target
  make[6]: *** [/linux/scripts/Makefile.build:250:
  drivers/gpu/drm/amd/amdgpu/../display/dc/dml/display_mode_lib.o] Error 1

This happens because the amdgpu build is only gated by
PPC_LONG_DOUBLE_128, but that symbol can be enabled even though AltiVec
is disabled.

The only user of PPC_LONG_DOUBLE_128 is amdgpu, so just add a dependency
on AltiVec to that symbol to fix the build.

Signed-off-by: Michael Ellerman <mpe at ellerman.id.au>
---
 arch/powerpc/Kconfig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 699df27b0e2f..20fb1765238c 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -285,7 +285,7 @@ config PPC
 	#
 
 config PPC_LONG_DOUBLE_128
-	depends on PPC64
+	depends on PPC64 && ALTIVEC
 	def_bool $(success,test "$(shell,echo __LONG_DOUBLE_128__ | $(CC) -E -P -)" = 1)
 
 config PPC_BARRIER_NOSPEC
-- 
2.37.3