[PATCH] powerpc: Allow selection of CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
Christophe LEROY
christophe.leroy at c-s.fr
Wed Apr 18 23:11:24 AEST 2018
Le 18/04/2018 à 10:36, Mathieu Malaterre a écrit :
> Christophe,
>
> On Wed, Apr 18, 2018 at 8:34 AM, Christophe LEROY
> <christophe.leroy at c-s.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 at c-s.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 at 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 at 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'.
Well, in a way yes. I initially thought that all those warnings where
normal, but indeed not. We were missing some things in powerpc linker
script, and most likely some sections ended up in the wrong place.
Last week I tested on an 8xx and it was booting without any issue.
I tested today on an 83xx and it was not booting.
I will soon send new patches with the fixes in the linker scripts.
Thanks for your help
Christophe
>
>
>> 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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>> generic_rtc_driver_exit
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>> __get_vm_area_caller
>> grub_reclaim
>> gup_fast_permitted
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>> handle_hmi_exception
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>> has_unmovable_pages
>> has_unmovable_pages.part.31
>> hdec_interrupt
>> hid_debug_exit
>> hid_exit
>> hid_generic_exit
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>> hrtimers_prepare_cpu
>> hwmon_exit
>> i2c_register_board_info
>> igmp_mcf_get_next.isra.4
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>> irqchip_init
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>> irq_domain_update_bus_token
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>> __is_kernel_percpu_address
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>> lookup_module_symbol_attrs
>> lookup_page_ext
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>> mac_var_to_vmode
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>> max_cfs_quota_period
>> max_possible_pfn
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>> memblock_is_region_memory
>> memblock_is_region_reserved
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>> memblock_start_of_DRAM
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>> migrate_prep
>> migrate_reason_names
>> migration_entry_wait_huge
>> min_cfs_quota_period
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>> mm_find_pmd
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>> mousedev_exit
>> mpc6xx_enter_standby
>> mpic_get_one_irq
>> mpic_setup_this_cpu
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>> noop_exit
>> nr_free_pagecache_pages
>> nsecs_to_usecs
>> num_powerpc_operands
>> nvmem_exit
>> nvram_cleanup
>> of_device_compatible_match
>> of_fdt_is_big_endian
>> of_fdt_limit_memory
>> __of_find_all_nodes
>> of_find_last_cache_level
>> of_find_matching_node_by_address
>> of_get_flat_dt_subnode_by_name
>> __of_get_property
>> of_msi_map_get_device_domain
>> __of_msi_map_rid
>> of_msi_map_rid
>> of_node_is_attached
>> of_parse_dma_window
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>> of_print_phandle_args
>> __of_remove_property
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>> __print_once.21255
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>> prof_cpu_mask_proc_show
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>> ptrace_get_reg
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>> pud_clear_bad
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>> rcu_test_sync_prims
>> read_bhrb
>> reclaim_clean_pages_from_list
>> refined_jiffies
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>> rsa_exit
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>> set_iounmap_nonlazy
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>> setup_per_zone_wmarks
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>> sys_msgget
>> sys_msgrcv
>> sys_msgsnd
>> __sysrq_get_key_op
>> sys_semctl
>> sys_semget
>> sys_semop
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>> sys_shmat
>> sys_shmctl
>> sys_shmdt
>> sys_shmget
>> sys_switch_endian
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>> tasklist_lock
>> task_rcu_dereference
>> __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
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>> 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
>>>>>>
>>>>
>>
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