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authorMichael Ellerman <mpe@ellerman.id.au>2016-10-20 16:00:14 +1100
committerMichael Ellerman <mpe@ellerman.id.au>2016-11-14 11:11:51 +1100
commit3a849815a13695ad0e32f6f01c90544922a72229 (patch)
treee72743b84cd949c7ecffa738498e087f49d53289 /arch/powerpc/Makefile
parent70839d207792aa348f013c733e8853c1bd3bc4f0 (diff)
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 468a33028edd ("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>
Diffstat (limited to 'arch/powerpc/Makefile')
-rw-r--r--arch/powerpc/Makefile1
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/powerpc/Makefile b/arch/powerpc/Makefile
index 617dece67924..041fda1e2a5d 100644
--- a/arch/powerpc/Makefile
+++ b/arch/powerpc/Makefile
@@ -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