Commit 3a849815 authored Oct 20, 2016 by Michael Ellerman

powerpc/book3s64: Always build for power4 or later



When we're not compiling for a specific CPU, ie. none of the
CONFIG_POWERx_CPU options are set, and CONFIG_GENERIC_CPU *is* set, we
currently don't pass any -mcpu option to the compiler. This means the
compiler builds for a "generic" Power CPU.

But back in 2014 we dropped support for pre power4 CPUs in commit
468a3302 ("powerpc: Drop support for pre-POWER4 cpus").

Given that, there's no point in building the kernel to run on pre power4
cpus. So update the flags we pass to the compiler when
CONFIG_GENERIC_CPU is set, to specify -mcpu=power4.

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

parent 70839d20

arch/powerpc/Makefile

+1 −0

Original line number	Diff line number	Diff line
		@@ -121,6 +121,7 @@ CFLAGS-$(CONFIG_PPC32) := -ffixed-r2 $(MULTIPLEWORD)

		ifeq ($(CONFIG_PPC_BOOK3S_64),y)
		CFLAGS-$(CONFIG_GENERIC_CPU) += $(call cc-option,-mtune=power7,-mtune=power4)
		CFLAGS-$(CONFIG_GENERIC_CPU) += -mcpu=power4
		else
		CFLAGS-$(CONFIG_GENERIC_CPU) += -mcpu=powerpc64
		endif

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