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| author | Michael Ellerman <mpe@ellerman.id.au> | 2016-10-20 08:00:14 +0300 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2016-11-14 03:11:51 +0300 |
| commit | 3a849815a13695ad0e32f6f01c90544922a72229 (patch) | |
| tree | e72743b84cd949c7ecffa738498e087f49d53289 /arch/powerpc/Makefile | |
| parent | 70839d207792aa348f013c733e8853c1bd3bc4f0 (diff) | |
| download | linux-3a849815a13695ad0e32f6f01c90544922a72229.tar.xz | |
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/Makefile | 1 |
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 |