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[209.132.180.67]) by mx.google.com with ESMTP id j7si511726pgq.426.2018.04.17.23.35.53; Tue, 17 Apr 2018 23:36:07 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752326AbeDRGen (ORCPT + 99 others); Wed, 18 Apr 2018 02:34:43 -0400 Received: from pegase1.c-s.fr ([93.17.236.30]:10602 "EHLO pegase1.c-s.fr" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751305AbeDRGel (ORCPT ); Wed, 18 Apr 2018 02:34:41 -0400 Received: from localhost (mailhub1-int [192.168.12.234]) by localhost (Postfix) with ESMTP id 40Qsm55PJFz9ttlH; Wed, 18 Apr 2018 08:34:29 +0200 (CEST) X-Virus-Scanned: Debian amavisd-new at c-s.fr Received: from pegase1.c-s.fr ([192.168.12.234]) by localhost (pegase1.c-s.fr [192.168.12.234]) (amavisd-new, port 10024) with ESMTP id k7ZhpcbAL1hg; Wed, 18 Apr 2018 08:34:29 +0200 (CEST) Received: from messagerie.si.c-s.fr (messagerie.si.c-s.fr [192.168.25.192]) by pegase1.c-s.fr (Postfix) with ESMTP id 40Qsm54bVcz9ttkY; Wed, 18 Apr 2018 08:34:29 +0200 (CEST) Received: from localhost (localhost [127.0.0.1]) by messagerie.si.c-s.fr (Postfix) with ESMTP id 8AA168B7AD; Wed, 18 Apr 2018 08:34:39 +0200 (CEST) X-Virus-Scanned: amavisd-new at c-s.fr Received: from messagerie.si.c-s.fr ([127.0.0.1]) by localhost (messagerie.si.c-s.fr [127.0.0.1]) (amavisd-new, port 10023) with ESMTP id mscd2Rt1Zhxa; Wed, 18 Apr 2018 08:34:39 +0200 (CEST) Received: from PO15451 (po15451.idsi0.si.c-s.fr [172.25.231.2]) by messagerie.si.c-s.fr (Postfix) with ESMTP id 5BD3B8B74B; Wed, 18 Apr 2018 08:34:39 +0200 (CEST) Subject: Re: [PATCH] powerpc: Allow selection of CONFIG_LD_DEAD_CODE_DATA_ELIMINATION To: Mathieu Malaterre Cc: Benjamin Herrenschmidt , Paul Mackerras , Michael Ellerman , linuxppc-dev , LKML References: <20180417104909.22D416C07D@po15720vm.idsi0.si.c-s.fr> From: Christophe LEROY Message-ID: <48cdb73c-f0c4-0c8a-19f5-8fce000e7050@c-s.fr> Date: Wed, 18 Apr 2018 08:34:39 +0200 User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:52.0) Gecko/20100101 Thunderbird/52.7.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: fr Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Le 17/04/2018 à 19:10, Mathieu Malaterre a écrit : > On Tue, Apr 17, 2018 at 6:49 PM, Christophe LEROY > wrote: >> >> >> Le 17/04/2018 à 18:45, Mathieu Malaterre a écrit : >>> >>> On Tue, Apr 17, 2018 at 12:49 PM, Christophe Leroy >>> 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 >>>> --- >>>> 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. Do you use one of the defconfigs of the kernel ? Otherwise, can you provide your .config ? Can you also provide a copy of the messages you can see (prom_init ...) when boot is ok ? Maybe you can also send me the two vmlinux objects. Thanks Christophe account_steal_time adbhid_exit adb_reset_bus add_range add_range_with_merge aes_fini af_unix_exit agp_exit agp_find_client_by_pid agp_find_mem_by_key agp_find_private agp_free_memory_wrap agpioc_protect_wrap agpioc_release_wrap agp_uninorth_cleanup __alloc_reserved_percpu all_stat_sessions all_stat_sessions_mutex apple_driver_exit arch_cpu_idle_dead arch_setup_msi_irq arch_teardown_msi_irq arch_tlb_gather_mmu asymmetric_key_cleanup asymmetric_key_hex_to_key_id ata_exit ata_tf_to_lba ata_tf_to_lba48 attribute_container_add_class_device_adapter attribute_container_trigger backlight_class_exit bdi_lock bhrb_table biovec_create_pool blk_stat_enable_accounting boot_mapsize bpf_map_meta_equal bvec_free bvec_nr_vecs calc_load_fold_active can_request_irq capacity_margin cap_inode_getsecurity cap_mmap_file cfq_exit cgroup_is_threaded cgroup_is_thread_root 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 cn_fini cn_queue_free_dev collect_mounts compaction_restarting copy_fpr_from_user copy_fpr_to_user copy_mount_string copy_msg cpu_check_up_prepare cpufreq_boost_trigger_state cpufreq_gov_performance_exit cpu_hotplug_state cpu_in_idle cpu_report_state cpu_set_state_online cpu_temp crashk_low_res crash_wake_offline create_prof_cpu_mask crypto_algapi_exit crypto_exit_proc crypto_null_mod_fini crypto_wq_exit css_rightmost_descendant css_set_lock cubictcp_unregister __current_kernel_time d_absolute_path dbg_release_bp_slot dbg_reserve_bp_slot deadline_exit deadline_exit debug_guardpage_ops default_restore_msi_irqs default_teardown_msi_irqs del_named_trigger dereference_module_function_descriptor __dev_pm_qos_flags dev_pm_qos_read_value devtree_lock die_will_crash disable_cpufreq dma_buf_deinit dma_common_contiguous_remap dma_common_pages_remap __dma_get_required_mask dma_pfn_limit_to_zone do_execveat do_fork __domain_nr do_msg_redirect_map do_pipe_flags do_sk_redirect_map drmem_lmb_memory_max drmem_update_dt dst_discard dummy_cmp dump_cpu_task dump_stack_set_arch_desc earlycon_acpi_spcr_enable early_find_capability early_printk early_read_config_byte early_write_config_byte exar_pci_driver_exit exit_elf_binfmt exit_misc_binfmt exit_pmz exit_script_binfmt exit_scsi fdt_add_mem_rsv fdt_add_property_ fdt_add_subnode fdt_add_subnode_namelen fdt_appendprop fdt_del_mem_rsv fdt_del_node fdt_delprop fdt_find_string_ fdt_get_alias fdt_get_max_phandle fdt_get_path fdt_get_property fdt_get_property_by_offset fdt_get_property_namelen fdt_move fdt_node_depth fdt_node_end_offset_ fdt_node_offset_by_compatible fdt_node_offset_by_phandle fdt_node_offset_by_prop_value fdt_nop_node fdt_nop_property fdt_num_mem_rsv fdt_offset_ptr fdt_open_into fdt_pack fdt_packblocks_ fdt_rw_check_header_ fdt_set_name fdt_setprop fdt_setprop_inplace fdt_setprop_inplace_namelen_partial fdt_setprop_placeholder fdt_splice_ fdt_string fdt_stringlist_count fdt_stringlist_get fdt_stringlist_search fdt_subnode_offset feature_lock fib_table_flush_external fib_trie_unmerge fib_unmerge find_named_trigger __finish_swait firmware_class_exit fixup_red_left force_printk_to_btext force_sig_bnderr force_sig_fault force_sig_pkuerr force_sig_ptrace_errno_trap fork_idle fprop_fraction_single __fprop_inc_percpu __fprop_inc_single 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 fsnotify_get_mark_safe fsnotify_prepare_user_wait fsnotify_put_mark_wake ftrace_exports ftrace_get_addr_curr ftrace_get_addr_new ftrace_graph_ret_addr ftrace_graph_stop ftrace_nr_registered_ops ftrace_ops_assist_func ftrace_ops_get_func 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 get_named_trigger_data get_safe_page get_syscall_name get_vm_area __get_vm_area_caller grub_reclaim gup_fast_permitted gup_hugepte handle_hmi_exception handle_percpu_devid_irq handle_percpu_irq has_unmovable_pages has_unmovable_pages.part.31 hdec_interrupt hid_debug_exit hid_exit hid_generic_exit hidraw_exit hrtimers_prepare_cpu hwmon_exit i2c_register_board_info igmp_mcf_get_next.isra.4 igmp_mcf_seq_fops igmp_mcf_seq_next igmp_mcf_seq_open igmp_mcf_seq_ops igmp_mcf_seq_show igmp_mcf_seq_start igmp_mcf_seq_stop igmp_mc_init igmp_mc_seq_fops igmp_mc_seq_next igmp_mc_seq_open igmp_mc_seq_ops igmp_mc_seq_show igmp_mc_seq_start igmp_mc_seq_stop igmp_netdev_event igmp_net_exit igmp_net_init igmp_net_ops igmp_notifier init_cpu_online init_cpu_possible init_cpu_present init_kernel_text init_thread_info input_exit input_leds_exit insert_resource_conflict insert_resource_expand_to_fit insert_stat instr_is_branch_to_addr instr_is_relative_link_branch iomem_map_sanity_check io_range_mutex ip6_ra_lock ipv4_blackhole_route ipv6_renew_options_kern ipv6_sysctl_unregister irq_chip_compose_msi_msg irqchip_init irq_cpu_offline irq_cpu_online irq_domain_set_info irq_domain_update_bus_token irq_get_next_irq irq_set_percpu_devid irq_set_percpu_devid_partition isa_io_special is_file_shm_hugepages is_hardlockup __is_kernel_percpu_address is_kernel_percpu_address is_module_address __is_module_percpu_address is_module_percpu_address is_named_trigger is_offset_in_branch_range isolate_freepages_range isolate_migratepages_range is_pageblock_removable_nolock __is_ram is_tracing_stopped is_vmalloc_or_module_addr is_vma_temporary_stack iterate_mounts k2_skiplist kcompactd_stop __key.36706 keyctl_negate_key key_serial_lock kimage_is_destination_range kmap_flush_unused __kmem_cache_alloc_bulk __kmem_cache_empty kobj_child_ns_ops kobj_ns_initial kobj_ns_netlink kobj_ns_type_registered kretprobe_blacklist kstat_incr_irq_this_cpu kswapd_stop ldsem_down_write_trylock leds_exit libata_transport_exit lockup_detector_cleanup lockup_detector_soft_poweroff log_buf_addr_get log_buf_len_get logbuf_lock logic_pio_register_range logic_pio_to_hwaddr logic_pio_trans_cpuaddr lookup_module_symbol_attrs lookup_page_ext lookup_resource lookup_symbol_attrs mac_var_to_vmode map_kernel_range_noflush max_cfs_quota_period max_possible_pfn memblock_add_node memblock_clear_nomap memblock_get_current_limit memblock_is_map_memory memblock_is_region_memory memblock_is_region_reserved memblock_mark_mirror memblock_mark_nomap memblock_overlaps_region memblock_reserved_size memblock_start_of_DRAM memblock_trim_memory metadata_dst_free migrate_huge_page_move_mapping migrate_prep migrate_reason_names migration_entry_wait_huge min_cfs_quota_period mmc_blk_exit mmc_exit mmc_pwrseq_emmc_driver_exit mmc_pwrseq_simple_driver_exit mm_find_pmd mmlist_lock mmput_async mmput_async_fn mnt_clone_internal mousedev_exit mpc6xx_enter_standby mpic_get_one_irq mpic_setup_this_cpu named_triggers n_null_exit 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 of_pci_map_rid of_print_phandle_args __of_remove_property __of_sysfs_remove_bin_file oops_may_print our_mnt p4d_clear_bad packet_exit page_counter_cancel page_mapped_in_vma page_mapping_file page_unlock_anon_vma_read panic_flush_kmsg_end panic_flush_kmsg_start pata_macio_exit patch_branch pause_named_trigger __pause_named_trigger.isra.4 pci_acs_enabled pci_acs_flags_enabled pci_acs_path_enabled pci_add_cap_save_buffer pcibios_max_latency pcibios_penalize_isa_irq pcibios_resource_survey_bus pci_bridge_group pci_bridge_groups pci_bus_set_current_state pci_dev_acs_enabled pci_devs_are_dma_aliases pci_dev_specific_acs_enabled pcie_cap_has_lnkctl pcie_dev_group pcie_dev_groups pci_ext_cfg_avail pci_for_each_dma_alias pci_get_interrupt_pin pci_get_new_domain_nr pci_lock __pci_msix_desc_mask_irq pci_parse_request_of_pci_ranges pci_pio_to_address pci_pme_wakeup pci_pme_wakeup_bus pci_quirk_amd_sb_acs pci_quirk_cavium_acs pci_quirk_intel_pch_acs pci_quirk_intel_spt_pch_acs pci_quirk_mf_endpoint_acs pci_quirk_qcom_rp_acs pci_quirk_xgene_acs pci_request_acs pci_set_platform_pm pci_setup_bridge pci_wakeup_bus pcpu_lock perf_duration_warn perf_duration_work perf_event_account_interrupt perf_event_attrs perf_event_exit_cpu perf_event_itrace_started perf_log_lost_samples perf_pmu_name perf_sample_event_took perf_sched_cb_dec perf_sched_cb_inc pgd_clear_bad phy_core_exit pin_insert pmac_get_uninorth_variant pm_generic_prepare pm_labels pm_system_cancel_wakeup power_events_sysfs_show powerpc_macros powerpc_num_macros power_supply_class_exit prandom_reseed_late pr_cont_kernfs_name prep_compound_page __print_once.21255 print_vma_addr prof_cpu_mask_proc_fops prof_cpu_mask_proc_open prof_cpu_mask_proc_show prof_cpu_mask_proc_write ptrace_get_reg ptrace_writedata pud_clear_bad randomize_page rcu_test_sync_prims read_bhrb reclaim_clean_pages_from_list refined_jiffies register_refined_jiffies register_stat_tracer regs_query_register_name relay_prepare_cpu remove_percpu_irq __report_allowed __report_avg reset_node_managed_pages __reset_stat_session restore_math ret_from_standby ring_buffer_event_time_stamp ring_buffer_nest_end ring_buffer_nest_start ring_buffer_page_len _rs.53145 rsa_exit rtc_dev_exit s2idle_set_ops save_named_trigger sched_idle_set_state sched_setattr_nocheck scsi_sysfs_unregister sdio_unregister_bus secondary_cpu_time_init send_sig_fault serial8250_exit serial_pci_driver_exit __se_sys_fadvise64_64 __se_sys_gethostname __se_sys_mmap_pgoff __se_sys_msgctl __se_sys_msgget __se_sys_msgrcv __se_sys_msgsnd __se_sys_semctl __se_sys_semget __se_sys_semop __se_sys_semtimedop __se_sys_shmat __se_sys_shmctl __se_sys_shmdt __se_sys_shmget __se_sys_sync_file_range set_breakpoint set_graph_array set_iounmap_nonlazy set_named_trigger_data set_pci_dma_ops set_thread_uses_vas setup_percpu_irq setup_per_zone_wmarks sg_pool_exit shmem_charge shmem_getpage shmem_uncharge shm_file_operations_huge simple_xattr_list_add skb_crc32c_csum_help skb_do_redirect smpboot_create_threads smpboot_park_threads smpboot_unpark_threads smu_init snapshot_additional_pages sort_range spi_register_board_info stack_trace_max_lock stat_dir stat_seq_next stat_seq_show stat_seq_start stat_seq_stop subtract_range swap_buf_le16 swap_lock sysctl_schedstats sys_fadvise64_64 sysfs_symlink_target_lock sys_gethostname sys_mmap_pgoff sys_msgctl sys_msgget sys_msgrcv sys_msgsnd __sysrq_get_key_op sys_semctl sys_semget sys_semop sys_semtimedop sys_shmat sys_shmctl sys_shmdt sys_shmget sys_switch_endian sys_sync_file_range 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 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 >>>> >>