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powerpc/cell: Drop CONFIG_TUNE_CELL in favour of CONFIG_CELL_CPU

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The TUNE_CELL option allows you to build a kernel that runs on multiple
CPUs but is tuned (ie. optimised) to run on Cell CPUs. Now days no one
is building a distro in that fashion, and any users who are building
custom kernels for their Cell machines are better off building with
CONFIG_CELL_CPU, which builds a kernel that only runs on Cell and
therefore can be optimised even more aggresively.

Dropping the option also avoids confusing other users, who are presented
with an option to tune for Cell when they are not building for a Cell
CPU at all.

Suggested-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Michael Ellerman 2015-10-13 19:17:07 +11:00
parent 39fcfb911c
commit bed08b7e1f
4 changed files with 2 additions and 15 deletions
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2
arch/powerpc/Makefile
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@ -157,8 +157,6 @@ CFLAGS-$(CONFIG_E500) += $(call cc-option,-mcpu=8540 -msoft-float,-mcpu=powerpc)
endif
endif
CFLAGS-$(CONFIG_TUNE_CELL) += $(call cc-option,-mtune=cell)
asinstr := $(call as-instr,lis 9$(comma)foo@high,-DHAVE_AS_ATHIGH=1)
KBUILD_CPPFLAGS += -Iarch/$(ARCH) $(asinstr)

2
arch/powerpc/configs/cell_defconfig
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@ -1,5 +1,5 @@
CONFIG_PPC64=y
CONFIG_TUNE_CELL=y
CONFIG_CELL_CPU=y
CONFIG_ALTIVEC=y
CONFIG_SMP=y
CONFIG_NR_CPUS=4

2
arch/powerpc/configs/ps3_defconfig
View File

@ -1,5 +1,5 @@
CONFIG_PPC64=y
CONFIG_TUNE_CELL=y
CONFIG_CELL_CPU=y
CONFIG_ALTIVEC=y
CONFIG_SMP=y
CONFIG_NR_CPUS=2

11
arch/powerpc/platforms/Kconfig.cputype
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@ -147,17 +147,6 @@ config 6xx
depends on PPC32 && PPC_BOOK3S
select PPC_HAVE_PMU_SUPPORT
config TUNE_CELL
bool "Optimize for Cell Broadband Engine"
depends on PPC64 && PPC_BOOK3S
help
Cause the compiler to optimize for the PPE of the Cell Broadband
Engine. This will make the code run considerably faster on Cell
but somewhat slower on other machines. This option only changes
the scheduling of instructions, not the selection of instructions
itself, so the resulting kernel will keep running on all other
machines.
# this is temp to handle compat with arch=ppc
config 8xx
bool