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From:   Mathieu Malaterre <malat@debian.org>
Date:   Wed, 18 Apr 2018 10:36:28 +0200
Message-ID: <CA+7wUszJzG4CyfO2_Tvmc_u9oMPxLQMaiP+HnhpEex6KCRgSYw@mail.gmail.com>
Subject: Re: [PATCH] powerpc: Allow selection of CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
To:     Christophe LEROY <christophe.leroy@c-s.fr>
Cc:     Benjamin Herrenschmidt <benh@kernel.crashing.org>,
        Paul Mackerras <paulus@samba.org>,
        Michael Ellerman <mpe@ellerman.id.au>,
        linuxppc-dev <linuxppc-dev@lists.ozlabs.org>,
        LKML <linux-kernel@vger.kernel.org>
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Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

Christophe,

On Wed, Apr 18, 2018 at 8:34 AM, Christophe LEROY
<christophe.leroy@c-s.fr> wrote:
>
>
> Le 17/04/2018 =C3=A0 19:10, Mathieu Malaterre a =C3=A9crit :
>>
>> On Tue, Apr 17, 2018 at 6:49 PM, Christophe LEROY
>> <christophe.leroy@c-s.fr> wrote:
>>>
>>>
>>>
>>> Le 17/04/2018 =C3=A0 18:45, Mathieu Malaterre a =C3=A9crit :
>>>>
>>>>
>>>> On Tue, Apr 17, 2018 at 12:49 PM, Christophe Leroy
>>>> <christophe.leroy@c-s.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@c-s.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 provi=
de
> your .config ?

This is a custom (ugly) one:

https://raw.githubusercontent.com/malaterre/linux/g4/arch/powerpc/configs/g=
4_defconfig

> Can you also provide a copy of the messages you can see (prom_init ...) w=
hen
> 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
>
> account_steal_time
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> cfq_exit
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> cgroup_migrate_add_src
> cgroup_migrate_vet_dst
> cgroup_on_dfl
> cgroup_sk_update_lock
> cgroupstats_build
> cgroup_task_count
> cgroup_transfer_tasks
> change_protection
> clean_sort_range
> clear_ftrace_function
> clear_zone_contiguous
> __clockevents_update_freq
> clockevents_update_freq
> clocksource_mark_unstable
> clocksource_touch_watchdog
> clone_property.isra.2
> cmp_range
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> cn_queue_free_dev
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> copy_fpr_from_user
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> die_will_crash
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> feature_lock
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> fib_unmerge
> find_named_trigger
> __finish_swait
> firmware_class_exit
> fixup_red_left
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> fprop_local_destroy_single
> fprop_local_init_single
> free_page_and_swap_cache
> free_workqueue_attrs
> fsl_mpic_primary_get_version
> fsnotify_add_mark
> fsnotify_finish_user_wait
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> ftrace_get_addr_new
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> ftrace_ops_trampoline
> ftrace_run_stop_machine
> ftrace_test_record
> ftrace_text_reserved
> __func__.3126
> __func__.53147
> func_ptr_is_kernel_text
> generic_ptrace_pokedata
> generic_rtc_driver_exit
> __get_cached_msi_msg
> get_cpu_cacheinfo
> get_iowait_load
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> get_safe_page
> get_syscall_name
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> __get_vm_area_caller
> grub_reclaim
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> lookup_module_symbol_attrs
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> max_cfs_quota_period
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> metadata_dst_free
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> sys_msgget
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> tasklist_lock
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> __task_rq_lock
> tau_interrupts
> tcp_fastopen_active_should_disable
> tcp_set_ulp_id
> tcpudp_mt_exit
> tg_set_cfs_period
> tg_set_cfs_quota
> tick_broadcast_ipi_handler
> tick_cancel_sched_timer
> tick_freeze
> tick_freeze_depth
> tick_nohz_get_idle_calls
> tick_nohz_get_idle_calls_cpu
> tick_nohz_idle_got_tick
> tick_nohz_idle_retain_tick
> tick_nohz_tick_stopped_cpu
> tick_suspend_local
> tick_unfreeze
> timer_migration_handler
> __tlb_remove_page_size
> tnum_sbin
> tnum_xor
> touch_softlockup_watchdog_sync
> trace_array_printk
> trace_array_printk_buf
> trace_array_vprintk
> trace_clock_in_ns
> trace_find_filtered_pid
> tracefs_remove
> trace_graph_function
> trace_keep_overwrite
> trace_latency_header
> tracer_init
> trace_stat_seq_ops
> tracing_is_enabled
> tracing_record_tgid
> tracing_start
> tracing_stat_fops
> tracing_stat_open
> tracing_stat_release
> uart_get_console
> udbg_printf
> unix_get_socket
> unpause_named_trigger
> unregister_stat_tracer
> uprobe_get_trap_addr
> using_ftrace_ops_list_func
> vfs_getxattr_alloc
> vfs_ioctl
> vle_num_opcodes
> 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
>>>>>
>>>
>