Message-ID: <CA+7wUszJzG4CyfO2_Tvmc_u9oMPxLQMaiP+HnhpEex6KCRgSYw@mail.gmail.com>
Date:   Wed, 18 Apr 2018 10:36:28 +0200
From:   Mathieu Malaterre <malat@...ian.org>
To:     Christophe LEROY <christophe.leroy@....fr>
Cc:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] powerpc: Allow selection of CONFIG_LD_DEAD_CODE_DATA_ELIMINATION

Christophe,

On Wed, Apr 18, 2018 at 8:34 AM, Christophe LEROY
<christophe.leroy@....fr> wrote:
>
>
> Le 17/04/2018 à 19:10, Mathieu Malaterre a écrit :
>>
>> On Tue, Apr 17, 2018 at 6:49 PM, Christophe LEROY
>> <christophe.leroy@....fr> wrote:
>>>
>>>
>>>
>>> Le 17/04/2018 à 18:45, Mathieu Malaterre a écrit :
>>>>
>>>>
>>>> On Tue, Apr 17, 2018 at 12:49 PM, Christophe Leroy
>>>> <christophe.leroy@....fr> wrote:
>>>>>
>>>>>
>>>>> This option does dead code and data elimination with the linker by
>>>>> compiling with -ffunction-sections -fdata-sections and linking with
>>>>> --gc-sections.
>>>>>
>>>>> By selecting this option on mpc885_ads_defconfig,
>>>>> vmlinux LOAD segment size gets reduced by 10%
>>>>>
>>>>> Program Header before the patch:
>>>>>       LOAD off    0x00010000 vaddr 0xc0000000 paddr 0x00000000 align
>>>>> 2**16
>>>>>            filesz 0x0036eda4 memsz 0x0038de04 flags rwx
>>>>>
>>>>> Program Header after the patch:
>>>>>       LOAD off    0x00010000 vaddr 0xc0000000 paddr 0x00000000 align
>>>>> 2**16
>>>>>            filesz 0x00316da4 memsz 0x00334268 flags rwx
>>>>>
>>>>> Signed-off-by: Christophe Leroy <christophe.leroy@....fr>
>>>>> ---
>>>>>    arch/powerpc/Kconfig | 8 ++++++++
>>>>>    1 file changed, 8 insertions(+)
>>>>>
>>>>> diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
>>>>> index 8fe4353be5e3..e1fac49cf465 100644
>>>>> --- a/arch/powerpc/Kconfig
>>>>> +++ b/arch/powerpc/Kconfig
>>>>> @@ -888,6 +888,14 @@ config PPC_MEM_KEYS
>>>>>
>>>>>             If unsure, say y.
>>>>>
>>>>> +config PPC_UNUSED_ELIMINATION
>>>>> +       bool "Eliminate unused functions and data from vmlinux"
>>>>> +       default n
>>>>> +       select LD_DEAD_CODE_DATA_ELIMINATION
>>>>> +       help
>>>>> +         Select this to do dead code and data elimination with the
>>>>> linker
>>>>> +         by compiling with -ffunction-sections -fdata-sections and
>>>>> linking
>>>>> +         with --gc-sections.
>>>>>    endmenu
>>>>>
>>>>
>>>> Just for reference, I cannot boot my Mac Mini G4 anymore (yaboot). The
>>>> messages I can see (prom_init) are:
>>>
>>>
>>>
>>> Which version of GCC do you use ?
>>
>>
>> $ powerpc-linux-gnu-gcc --version
>> powerpc-linux-gnu-gcc (Debian 6.3.0-18) 6.3.0 20170516
>> Copyright (C) 2016 Free Software Foundation, Inc.
>> This is free software; see the source for copying conditions.  There is NO
>> warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR
>> PURPOSE.
>>
>> this is simply coming from:
>>
>> $ apt-cache policy crossbuild-essential-powerpc
>> crossbuild-essential-powerpc:
>>    Installed: 12.3
>>    Candidate: 12.3
>>    Version table:
>>   *** 12.3 500
>>          500 http://ftp.fr.debian.org/debian stretch/main amd64 Packages
>>          500 http://ftp.fr.debian.org/debian stretch/main i386 Packages
>>          100 /var/lib/dpkg/status
>>
>>
>>> Can you provide the generated System.map with and without that option
>>> active
>>> ?
>>
>>
>> $ du -sh g4/System.map.*
>> 1.7M g4/System.map.with
>> 1.8M g4/System.map.without
>
>
> Here below is the list of objects removed with the option selected. I can't
> see anything suspect at first.

Does this help:

$ grep orphan /tmp/g4.log|grep prom_init
powerpc-linux-gnu-ld: warning: orphan section `.sbss.of_workarounds'
from `arch/powerpc/kernel/prom_init.o' being placed in section
`.sbss.of_workarounds'.
powerpc-linux-gnu-ld: warning: orphan section `.sbss.of_workarounds'
from `arch/powerpc/kernel/prom_init.o' being placed in section
`.sbss.of_workarounds'.
powerpc-linux-gnu-ld: warning: orphan section `.sbss.of_workarounds'
from `arch/powerpc/kernel/prom_init.o' being placed in section
`.sbss.of_workarounds'.


> Do you use one of the defconfigs of the kernel ? Otherwise, can you provide
> your .config ?

This is a custom (ugly) one:

https://raw.githubusercontent.com/malaterre/linux/g4/arch/powerpc/configs/g4_defconfig

> Can you also provide a copy of the messages you can see (prom_init ...) when
> boot is ok ?

Hum. I've always been interested in seeing it also myself. Is there a
way to setup env to see those message (netconsole, delayed boot
messages ...) ? I never found a clear documentation on how to do that
on (closed) Apple hardware.

> Maybe you can also send me the two vmlinux objects.

Well if that can help. I'll send them by private emails.

> Thanks
> Christophe
>
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> cgroup_task_count
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> vle_opcodes
> vma_is_special_mapping
> vma_is_stack_for_current
> vm_numa_stat_key
> vsx_unavailable_exception
> vwrite
> walk_iomem_res_desc
> walk_mem_res
> walk_system_ram_res
> watchdog_dev_exit
> watchdog_exit
> workqueue_prepare_cpu
> wq_update_unbound_numa
> x509_key_exit
> xt_fini
> xtime_update
> zone_pcp_reset
>
>
>
>>
>> Will send them by private emails.
>>
>>> Thanks
>>> Christophe
>>>
>>>
>>>>
>>>> ---
>>>> done
>>>> copying OF device tree...
>>>> Building dt strings...
>>>> Building dt structure...
>>>> Device tree strings 0x01100000 -> 0x01100e02
>>>> Device tree struct   0x01101000 -> 0x01109000
>>>> Quiescing Open Firmware ...
>>>> Booting Linux via __start() @ 0x00140000 ...
>>>> _
>>>> ---
>>>>
>>>>
>>>>
>>>>>    config ISA_DMA_API
>>>>> --
>>>>> 2.13.3
>>>>>
>>>
>

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