| Message ID | 20230302131656.50626-1-mpe@ellerman.id.au (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | [1/2] powerpc/64: Move CPU -mtune options into Kconfig | expand |
On Fri, Mar 03, 2023 at 12:16:55AM +1100, Michael Ellerman wrote: > Currently the -mtune options are set in the Makefile, depending on what > is the compiler supports. > > One downside of doing it that way is that the chosen -mtune option is > not recorded in the .config. > > Another downside is that doing more complicated logic to calculate the > correct option gets messy in the Makefile. > > So move the determination of which -mtune option to use into Kconfig > logic. > > Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Reviewed-by: Nathan Chancellor <nathan@kernel.org> > --- > arch/powerpc/Makefile | 4 +--- > arch/powerpc/platforms/Kconfig.cputype | 6 ++++++ > 2 files changed, 7 insertions(+), 3 deletions(-) > > diff --git a/arch/powerpc/Makefile b/arch/powerpc/Makefile > index 87d6ac27eebd..779956007f0c 100644 > --- a/arch/powerpc/Makefile > +++ b/arch/powerpc/Makefile > @@ -156,9 +156,7 @@ endif > CFLAGS-$(CONFIG_TARGET_CPU_BOOL) += -mcpu=$(CONFIG_TARGET_CPU) > AFLAGS-$(CONFIG_TARGET_CPU_BOOL) += -mcpu=$(CONFIG_TARGET_CPU) > > -CFLAGS-$(CONFIG_POWERPC64_CPU) += $(call cc-option,-mtune=power10, \ > - $(call cc-option,-mtune=power9, \ > - $(call cc-option,-mtune=power8))) > +CFLAGS-y += $(CONFIG_TUNE_CPU) > > asinstr := $(call as-instr,lis 9$(comma)foo@high,-DHAVE_AS_ATHIGH=1) > > diff --git a/arch/powerpc/platforms/Kconfig.cputype b/arch/powerpc/platforms/Kconfig.cputype > index 046b571496b1..7d7477b73951 100644 > --- a/arch/powerpc/platforms/Kconfig.cputype > +++ b/arch/powerpc/platforms/Kconfig.cputype > @@ -273,6 +273,12 @@ config TARGET_CPU > default "e500mc" if E500MC_CPU > default "powerpc" if POWERPC_CPU > > +config TUNE_CPU > + string > + default "-mtune=power10" if POWERPC64_CPU && CC_IS_GCC && $(cc-option,-mtune=power10) > + default "-mtune=power9" if POWERPC64_CPU && CC_IS_GCC && $(cc-option,-mtune=power9) > + default "-mtune=power8" if POWERPC64_CPU && CC_IS_GCC && $(cc-option,-mtune=power8) Would it be cleaner to hoist the POWERPC64_CPU dependency? config TUNE_CPU string default "-mtune=power10" if CC_IS_GCC && $(cc-option,-mtune=power10) default "-mtune=power9" if CC_IS_GCC && $(cc-option,-mtune=power9) default "-mtune=power8" if CC_IS_GCC && $(cc-option,-mtune=power8) depends on POWERPC64_CPU > + > config PPC_BOOK3S > def_bool y > depends on PPC_BOOK3S_32 || PPC_BOOK3S_64 > -- > 2.39.2 >
Nathan Chancellor <nathan@kernel.org> writes: > On Fri, Mar 03, 2023 at 12:16:55AM +1100, Michael Ellerman wrote: >> Currently the -mtune options are set in the Makefile, depending on what >> is the compiler supports. >> >> One downside of doing it that way is that the chosen -mtune option is >> not recorded in the .config. >> >> Another downside is that doing more complicated logic to calculate the >> correct option gets messy in the Makefile. >> >> So move the determination of which -mtune option to use into Kconfig >> logic. >> >> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> > > Reviewed-by: Nathan Chancellor <nathan@kernel.org> > >> --- >> arch/powerpc/Makefile | 4 +--- >> arch/powerpc/platforms/Kconfig.cputype | 6 ++++++ >> 2 files changed, 7 insertions(+), 3 deletions(-) >> >> diff --git a/arch/powerpc/Makefile b/arch/powerpc/Makefile >> index 87d6ac27eebd..779956007f0c 100644 >> --- a/arch/powerpc/Makefile >> +++ b/arch/powerpc/Makefile >> @@ -156,9 +156,7 @@ endif >> CFLAGS-$(CONFIG_TARGET_CPU_BOOL) += -mcpu=$(CONFIG_TARGET_CPU) >> AFLAGS-$(CONFIG_TARGET_CPU_BOOL) += -mcpu=$(CONFIG_TARGET_CPU) >> >> -CFLAGS-$(CONFIG_POWERPC64_CPU) += $(call cc-option,-mtune=power10, \ >> - $(call cc-option,-mtune=power9, \ >> - $(call cc-option,-mtune=power8))) >> +CFLAGS-y += $(CONFIG_TUNE_CPU) >> >> asinstr := $(call as-instr,lis 9$(comma)foo@high,-DHAVE_AS_ATHIGH=1) >> >> diff --git a/arch/powerpc/platforms/Kconfig.cputype b/arch/powerpc/platforms/Kconfig.cputype >> index 046b571496b1..7d7477b73951 100644 >> --- a/arch/powerpc/platforms/Kconfig.cputype >> +++ b/arch/powerpc/platforms/Kconfig.cputype >> @@ -273,6 +273,12 @@ config TARGET_CPU >> default "e500mc" if E500MC_CPU >> default "powerpc" if POWERPC_CPU >> >> +config TUNE_CPU >> + string >> + default "-mtune=power10" if POWERPC64_CPU && CC_IS_GCC && $(cc-option,-mtune=power10) >> + default "-mtune=power9" if POWERPC64_CPU && CC_IS_GCC && $(cc-option,-mtune=power9) >> + default "-mtune=power8" if POWERPC64_CPU && CC_IS_GCC && $(cc-option,-mtune=power8) > > Would it be cleaner to hoist the POWERPC64_CPU dependency? I was experimenting with some follow-on patches that add more cases for other CPUs, but that got messy and it'll need a bit more work. So for now yes I should just hoist that dependency. cheers > config TUNE_CPU > string > default "-mtune=power10" if CC_IS_GCC && $(cc-option,-mtune=power10) > default "-mtune=power9" if CC_IS_GCC && $(cc-option,-mtune=power9) > default "-mtune=power8" if CC_IS_GCC && $(cc-option,-mtune=power8) > depends on POWERPC64_CPU
diff --git a/arch/powerpc/Makefile b/arch/powerpc/Makefile index 87d6ac27eebd..779956007f0c 100644 --- a/arch/powerpc/Makefile +++ b/arch/powerpc/Makefile @@ -156,9 +156,7 @@ endif CFLAGS-$(CONFIG_TARGET_CPU_BOOL) += -mcpu=$(CONFIG_TARGET_CPU) AFLAGS-$(CONFIG_TARGET_CPU_BOOL) += -mcpu=$(CONFIG_TARGET_CPU) -CFLAGS-$(CONFIG_POWERPC64_CPU) += $(call cc-option,-mtune=power10, \ - $(call cc-option,-mtune=power9, \ - $(call cc-option,-mtune=power8))) +CFLAGS-y += $(CONFIG_TUNE_CPU) asinstr := $(call as-instr,lis 9$(comma)foo@high,-DHAVE_AS_ATHIGH=1) diff --git a/arch/powerpc/platforms/Kconfig.cputype b/arch/powerpc/platforms/Kconfig.cputype index 046b571496b1..7d7477b73951 100644 --- a/arch/powerpc/platforms/Kconfig.cputype +++ b/arch/powerpc/platforms/Kconfig.cputype @@ -273,6 +273,12 @@ config TARGET_CPU default "e500mc" if E500MC_CPU default "powerpc" if POWERPC_CPU +config TUNE_CPU + string + default "-mtune=power10" if POWERPC64_CPU && CC_IS_GCC && $(cc-option,-mtune=power10) + default "-mtune=power9" if POWERPC64_CPU && CC_IS_GCC && $(cc-option,-mtune=power9) + default "-mtune=power8" if POWERPC64_CPU && CC_IS_GCC && $(cc-option,-mtune=power8) + config PPC_BOOK3S def_bool y depends on PPC_BOOK3S_32 || PPC_BOOK3S_64
Currently the -mtune options are set in the Makefile, depending on what is the compiler supports. One downside of doing it that way is that the chosen -mtune option is not recorded in the .config. Another downside is that doing more complicated logic to calculate the correct option gets messy in the Makefile. So move the determination of which -mtune option to use into Kconfig logic. Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> --- arch/powerpc/Makefile | 4 +--- arch/powerpc/platforms/Kconfig.cputype | 6 ++++++ 2 files changed, 7 insertions(+), 3 deletions(-)