linux-kernel - Re: [PATCH] powerpc: e500: Fix compilation with gcc e500 compiler

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Message-ID: <20220710175727.ee52xoqfwlphjxv5@pali>
Date:   Sun, 10 Jul 2022 19:57:27 +0200
From:   Pali Rohár <pali@...nel.org>
To:     Christophe Leroy <christophe.leroy@...roup.eu>
Cc:     Arnd Bergmann <arnd@...db.de>,
        Michael Ellerman <michael@...erman.id.au>,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] powerpc: e500: Fix compilation with gcc e500 compiler

On Sunday 10 July 2022 17:38:33 Christophe Leroy wrote:
> Le 09/07/2022 à 12:23, Pali Rohár a écrit :
> >>>    
> >>> -ifdef CONFIG_PPC_BOOK3S_64
> >>>    ifdef CONFIG_CPU_LITTLE_ENDIAN
> >>> -CFLAGS-$(CONFIG_GENERIC_CPU) += -mcpu=power8
> >>> -CFLAGS-$(CONFIG_GENERIC_CPU) += $(call cc-option,-mtune=power9,-mtune=power8)
> >>> +CFLAGS-$(CONFIG_PPC_BOOK3S_64) += -mcpu=power8
> >>> +CFLAGS-$(CONFIG_PPC_BOOK3S_64) += $(call cc-option,-mtune=power9,-mtune=power8)
> >>>    else
> >>> -CFLAGS-$(CONFIG_GENERIC_CPU) += $(call cc-option,-mtune=power7,$(call cc-option,-mtune=power5))
> >>> -CFLAGS-$(CONFIG_GENERIC_CPU) += $(call cc-option,-mcpu=power5,-mcpu=power4)
> >>> -endif
> >>> -else ifdef CONFIG_PPC_BOOK3E_64
> >>> -CFLAGS-$(CONFIG_GENERIC_CPU) += -mcpu=powerpc64
> >>> +CFLAGS-$(CONFIG_PPC_BOOK3S_64) += $(call cc-option,-mtune=power7,$(call cc-option,-mtune=power5))
> >>> +CFLAGS-$(CONFIG_PPC_BOOK3S_64) += $(call cc-option,-mcpu=power5,-mcpu=power4)
> >>
> >> So before that change I got -mcpu=power9
> >>
> >> Now I get -mtune=power7 -mcpu=power5 -mcpu=power9
> > 
> > I did it like Arnd wrote.
> > 
> > And seems that it does not work and now is fully out of the scope of the
> > original issue. Now I'm really lost here.
> > 
> > So I nobody comes with better solution, I would prefer to stick with my
> > original version which targets _only_ e500 cores.
> > 
> > Any other suggestion?
> 
> I sent a patch based on the TARGET_CPU logic, does it work for you ?
> 
> Christophe

Perfect, it works! Thank you.


Anyway, same problem is with arch/powerpc/boot/Makefile file when
building "uImage" target. There is hardcoded -mcpu=powerpc flag.