linux-kernel - Re: [PATCH] compiler: allow all arches to enable CONFIG_OPTIMIZE

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Date:   Tue, 26 Mar 2019 07:02:54 +0100
From:   Christophe Leroy <christophe.leroy@....fr>
To:     Masahiro Yamada <yamada.masahiro@...ionext.com>
Cc:     Arnd Bergmann <arnd@...db.de>,
        linux-arch <linux-arch@...r.kernel.org>,
        linux-s390 <linux-s390@...r.kernel.org>,
        Dave Hansen <dave@...1.net>,
        the arch/x86 maintainers <x86@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-mips@...r.kernel.org, Paul Burton <paul.burton@...s.com>,
        Ingo Molnar <mingo@...hat.com>,
        linux-mtd <linux-mtd@...ts.infradead.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH] compiler: allow all arches to enable
 CONFIG_OPTIMIZE_INLINING

Hi Masahiro,

Le 25/03/2019 à 07:44, Masahiro Yamada a écrit :
> Hi Christophe,
> 
> 
> On Sat, Mar 23, 2019 at 5:27 PM LEROY Christophe
> <christophe.leroy@....fr> wrote:
>>
>> Arnd Bergmann <arnd@...db.de> a écrit :
>>
>>> On Wed, Mar 20, 2019 at 10:41 AM Arnd Bergmann <arnd@...db.de> wrote:
>>>>
>>>> I've added your patch to my randconfig test setup and will let you
>>>> know if I see anything noticeable. I'm currently testing clang-arm32,
>>>> clang-arm64 and gcc-x86.
>>>
>>> This is the only additional bug that has come up so far:
>>>
>>> `.exit.text' referenced in section `.alt.smp.init' of
>>> drivers/char/ipmi/ipmi_msghandler.o: defined in discarded section
>>> `exit.text' of drivers/char/ipmi/ipmi_msghandler.o
>>
>> Wouldn't it be useful to activate -Winline gcc warning to ease finding
>> out problematic usage of inline keyword ?
> 
> 
> Yes, it is useful to find out
> which function is causing the error.
> Thanks for the tip.
> 

I did a mass build on kisskb. Almost ok, see results at 
http://kisskb.ellerman.id.au/kisskb/head/203d912edf8dde291977c71aa64024065e197f79/

ps3_defconfig with GCC 5 fails 
(http://kisskb.ellerman.id.au/kisskb/buildresult/13742711/) with:

arch/powerpc/mm/tlb-radix.c:148:2: error: asm operand 3 probably doesn't 
match constraints [-Werror]
arch/powerpc/mm/tlb-radix.c:148:2: error: impossible constraint in 'asm'
arch/powerpc/mm/tlb-radix.c:118:2: error: asm operand 3 probably doesn't 
match constraints [-Werror]
arch/powerpc/mm/tlb-radix.c:104:2: error: asm operand 3 probably doesn't 
match constraints [-Werror]

ps3_defconfig with GCC 4.6 fails 
(http://kisskb.ellerman.id.au/kisskb/buildresult/13742591/) with:

arch/powerpc/mm/tlb-radix.c:148:2: error: asm operand 3 probably doesn't 
match constraints [-Werror]
arch/powerpc/mm/tlb-radix.c:118:2: error: asm operand 3 probably doesn't 
match constraints [-Werror]
arch/powerpc/mm/tlb-radix.c:104:2: error: asm operand 3 probably doesn't 
match constraints [-Werror]

randconfig with GCC 4.6 fails 
(http://kisskb.ellerman.id.au/kisskb/buildresult/13742698/) with:

arch/powerpc/mm/tlb-radix.c:104:2: error: impossible constraint in 'asm'

Christophe