Le 28/08/2022 à 19:41, Pali Rohár a écrit :
> On Sunday 28 August 2022 17:39:25 Christophe Leroy wrote:
>> Le 28/08/2022 à 19:33, Christophe Leroy a écrit :
>>>
>>>
>>> Le 28/08/2022 à 11:56, Pali Rohár a écrit :
>>>> When CONFIG_TARGET_CPU is specified then pass its value to the compiler
>>>> -mcpu option. This fixes following build error when building kernel with
>>>> powerpc e500 SPE capable cross compilers:
>>>>
>>>> BOOTAS arch/powerpc/boot/crt0.o
>>>> powerpc-linux-gnuspe-gcc: error: unrecognized argument in option
>>>> ‘-mcpu=powerpc’
>>>> powerpc-linux-gnuspe-gcc: note: valid arguments to ‘-mcpu=’ are:
>>>> 8540 8548 native
>>>> make[1]: *** [arch/powerpc/boot/Makefile:231:
>>>> arch/powerpc/boot/crt0.o] Error 1
>>>
>>> corenet64_smp_defconfig :
>>>
>>> BOOTAS arch/powerpc/boot/crt0.o
>>> powerpc64-linux-gcc: error: missing argument to '-mcpu='
>>> make[1]: *** [arch/powerpc/boot/Makefile:237 : arch/powerpc/boot/crt0.o]
>>> Erreur 1
>>> make: *** [arch/powerpc/Makefile:253 : uImage] Erreur 2
>>>
>>>
>>
>> Seems like in fact, E5500_CPU and E6500_CPU are not taken into account
>> in CONFIG_TARGET_CPU, and get special treatment directly in
>> arch/powerpc/Makefile.
>>
>> This goes unnoticed because of CFLAGS-$(CONFIG_TARGET_CPU_BOOL) +=
>> $(call cc-option,-mcpu=$(CONFIG_TARGET_CPU))
>>
>> I think we need to fix that prior to your patch.
>
> It looks like that CONFIG_TARGET_CPU is broken.
>
> $ make ARCH=powerpc corenet64_smp_defconfig
> CROSS_COMPILE=powerpc64-linux-gnu-
> ...
> # configuration written to .config
>
> $ grep CONFIG_TARGET_CPU .config
> CONFIG_TARGET_CPU_BOOL=y
>
> CONFIG_TARGET_CPU_BOOL is set but CONFIG_TARGET_CPU not!
Yes, because there is no default value for E5500_CPU and E6500_CPU. We
need to add one for each.
>
>>> Christophe
>>>
>>>
>>>>
>>>> Similar change was already introduced for the main powerpc Makefile in
>>>> commit 446cda1b21d9 ("powerpc/32: Don't always pass -mcpu=powerpc to the
>>>> compiler").
>>>>
>>>> Fixes: 40a75584e526 ("powerpc/boot: Build wrapper for an appropriate
>>>> CPU")
>>>> Cc: sta...@vger.kernel.org # 446cda1b21d9 ("powerpc/32: Don't always
>>>> pass -mcpu=powerpc to the compiler")
>>>> Signed-off-by: Pali Rohár <p...@kernel.org>
>>>> ---
>>>> arch/powerpc/boot/Makefile | 14 ++++++++++----
>>>> 1 file changed, 10 insertions(+), 4 deletions(-)
>>>>
>>>> diff --git a/arch/powerpc/boot/Makefile b/arch/powerpc/boot/Makefile
>>>> index a9cd2ea4a861..1957a3de7a1c 100644
>>>> --- a/arch/powerpc/boot/Makefile
>>>> +++ b/arch/powerpc/boot/Makefile
>>>> @@ -38,13 +38,19 @@ BOOTCFLAGS := -Wall -Wundef -Wstrict-prototypes
>>>> -Wno-trigraphs \
>>>> $(LINUXINCLUDE)
>>>> ifdef CONFIG_PPC64_BOOT_WRAPPER
>>>> -ifdef CONFIG_CPU_LITTLE_ENDIAN
>>>> -BOOTCFLAGS += -m64 -mcpu=powerpc64le
>>>> +BOOTCFLAGS += -m64
>>>> else
>>>> -BOOTCFLAGS += -m64 -mcpu=powerpc64
>>>> +BOOTCFLAGS += -m32
>>>> endif
>>>> +
>>>> +ifdef CONFIG_TARGET_CPU_BOOL
>>>> +BOOTCFLAGS += -mcpu=$(CONFIG_TARGET_CPU)
>>>> +else ifdef CONFIG_PPC64_BOOT_WRAPPER
>>>> +ifdef CONFIG_CPU_LITTLE_ENDIAN
>>>> +BOOTCFLAGS += -mcpu=powerpc64le
>>>> else
>>>> -BOOTCFLAGS += -m32 -mcpu=powerpc
>>>> +BOOTCFLAGS += -mcpu=powerpc64
>>>> +endif
>>>> endif
>>>> BOOTCFLAGS += -isystem $(shell $(BOOTCC) -print-file-name=include)
