Re: [Cocci] [RFC] treewide: cleanup unreachable breaks

[Julia Lawall]

On Sat, 17 Oct 2020, Joe Perches wrote:

> On Sat, 2020-10-17 at 09:09 -0700, trix@xxxxxxxxxx wrote:
> > From: Tom Rix <trix@xxxxxxxxxx>
> >
> > This is a upcoming change to clean up a new warning treewide.
> > I am wondering if the change could be one mega patch (see below) or
> > normal patch per file about 100 patches or somewhere half way by collecting
> > early acks.
> >
> > clang has a number of useful, new warnings see
> > https://clang.llvm.org/docs/DiagnosticsReference.html
> >
> > This change cleans up -Wunreachable-code-break
> > https://clang.llvm.org/docs/DiagnosticsReference.html#wunreachable-code-break
> > for 266 of 485 warnings in this week's linux-next, allyesconfig on x86_64.
>
> Early acks/individual patches by subsystem would be good.
> Better still would be an automated cocci script.

Coccinelle is not especially good at this, because it is based on control
flow, and a return or goto diverts the control flow away from the break.
A hack to solve the problem is to put an if around the return or goto, but
that gives the break a meaningless file name and line number.  I collected
the following list, but it only has 439 results, so fewer than clang.  But
maybe there are some files that are not considered by clang in the x86
allyesconfig configuration.

Probably checkpatch is the best solution here, since it is not
configuration sensitive and doesn't care about control flow.

julia

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drivers/gpu/drm/amd/display/dc/dcn10/dcn10_resource.c: function map_transmitter_id_to_phy_instance line 12
drivers/gpu/drm/amd/display/dc/dcn10/dcn10_resource.c: function map_transmitter_id_to_phy_instance line 15
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drivers/gpu/drm/amd/display/dc/dce120/dce120_resource.c: function map_transmitter_id_to_phy_instance line 24
drivers/net/wireless/realtek/rtlwifi/rtl8188ee/hw.c: function _rtl88ee_set_media_status line 35
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drivers/s390/char/tape_3590.c: function tape_3590_erp_read_opposite line 15
drivers/gpu/drm/amd/display/dc/dce80/dce80_resource.c: function map_transmitter_id_to_phy_instance line 6
drivers/gpu/drm/amd/display/dc/dce80/dce80_resource.c: function map_transmitter_id_to_phy_instance line 9
drivers/gpu/drm/amd/display/dc/dce80/dce80_resource.c: function map_transmitter_id_to_phy_instance line 12
drivers/gpu/drm/amd/display/dc/dce80/dce80_resource.c: function map_transmitter_id_to_phy_instance line 15
drivers/gpu/drm/amd/display/dc/dce80/dce80_resource.c: function map_transmitter_id_to_phy_instance line 18
drivers/gpu/drm/amd/display/dc/dce80/dce80_resource.c: function map_transmitter_id_to_phy_instance line 21
drivers/gpu/drm/amd/display/dc/dce80/dce80_resource.c: function map_transmitter_id_to_phy_instance line 24
drivers/media/usb/ttusb-dec/ttusb_dec.c: function ttusb_dec_start_feed line 16
drivers/media/usb/ttusb-dec/ttusb_dec.c: function ttusb_dec_start_feed line 20
drivers/media/usb/ttusb-dec/ttusb_dec.c: function ttusb_dec_stop_feed line 7
drivers/media/usb/ttusb-dec/ttusb_dec.c: function ttusb_dec_stop_feed line 11
drivers/net/ethernet/cisco/enic/enic_ethtool.c: function enic_grxclsrule line 19
security/integrity/ima/ima_appraise.c: function ima_get_hash_algo line 18
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sound/pci/rme9652/hdspm.c: function hdspm_wc_sync_check line 16
sound/pci/rme9652/hdspm.c: function hdspm_wc_sync_check line 29
sound/pci/rme9652/hdspm.c: function hdspm_wc_sync_check line 43
sound/pci/rme9652/hdspm.c: function hdspm_get_tco_sample_rate line 10
sound/pci/rme9652/hdspm.c: function hdspm_get_sync_in_sample_rate line 10
sound/pci/rme9652/hdspm.c: function hdspm_get_wc_sample_rate line 9
drivers/nfc/trf7970a.c: function trf7970a_is_iso15693_write_or_lock line 11
drivers/media/usb/gspca/pac_common.h: function pac_find_sof line 45
drivers/net/ethernet/aquantia/atlantic/aq_nic.c: function aq_nic_set_link_ksettings line 46
drivers/scsi/lpfc/lpfc_scsi.c: function lpfc_scsi_api_table_setup line 25
drivers/media/dvb-frontends/nxt200x.c: function nxt200x_readreg_multibyte line 18
drivers/media/dvb-frontends/nxt200x.c: function nxt200x_readreg_multibyte line 41
drivers/media/dvb-frontends/nxt200x.c: function nxt200x_readreg_multibyte line 44
drivers/media/dvb-frontends/nxt200x.c: function nxt200x_writereg_multibyte line 30
drivers/media/dvb-frontends/nxt200x.c: function nxt200x_writereg_multibyte line 54
drivers/media/dvb-frontends/nxt200x.c: function nxt200x_setup_frontend_parameters line 33
drivers/media/dvb-frontends/nxt200x.c: function nxt200x_setup_frontend_parameters line 58
drivers/media/dvb-frontends/nxt200x.c: function nxt200x_setup_frontend_parameters line 72
drivers/media/dvb-frontends/nxt200x.c: function nxt200x_setup_frontend_parameters line 88
drivers/media/dvb-frontends/nxt200x.c: function nxt200x_setup_frontend_parameters line 104
drivers/media/dvb-frontends/nxt200x.c: function nxt200x_setup_frontend_parameters line 116
drivers/media/dvb-frontends/nxt200x.c: function nxt200x_setup_frontend_parameters line 142
drivers/media/dvb-frontends/nxt200x.c: function nxt200x_setup_frontend_parameters line 198
drivers/media/dvb-frontends/nxt200x.c: function nxt200x_setup_frontend_parameters line 220
drivers/media/dvb-frontends/nxt200x.c: function nxt200x_init line 15
drivers/media/dvb-frontends/nxt200x.c: function nxt200x_writetuner line 57
drivers/tty/serial/imx.c: function imx_uart_readl line 5
drivers/tty/serial/imx.c: function imx_uart_readl line 16
drivers/tty/serial/imx.c: function imx_uart_readl line 19
drivers/tty/serial/imx.c: function imx_uart_readl line 22
drivers/tty/serial/imx.c: function imx_uart_readl line 25
drivers/crypto/atmel-sha.c: function atmel_sha_init line 37
drivers/edac/amd64_edac.c: function map_err_sym_to_channel line 7
drivers/edac/amd64_edac.c: function map_err_sym_to_channel line 11
drivers/edac/amd64_edac.c: function map_err_sym_to_channel line 14
drivers/edac/amd64_edac.c: function map_err_sym_to_channel line 24
drivers/edac/amd64_edac.c: function map_err_sym_to_channel line 28
drivers/edac/amd64_edac.c: function map_err_sym_to_channel line 31
drivers/edac/amd64_edac.c: function map_err_sym_to_channel line 34
drivers/gpu/drm/amd/display/dc/dce60/dce60_resource.c: function map_transmitter_id_to_phy_instance line 6
drivers/gpu/drm/amd/display/dc/dce60/dce60_resource.c: function map_transmitter_id_to_phy_instance line 9
drivers/gpu/drm/amd/display/dc/dce60/dce60_resource.c: function map_transmitter_id_to_phy_instance line 12
drivers/gpu/drm/amd/display/dc/dce60/dce60_resource.c: function map_transmitter_id_to_phy_instance line 15
drivers/gpu/drm/amd/display/dc/dce60/dce60_resource.c: function map_transmitter_id_to_phy_instance line 18
drivers/gpu/drm/amd/display/dc/dce60/dce60_resource.c: function map_transmitter_id_to_phy_instance line 21
drivers/gpu/drm/amd/display/dc/dce60/dce60_resource.c: function map_transmitter_id_to_phy_instance line 24
drivers/scsi/st.c: function st_int_ioctl line 155
drivers/infiniband/hw/cxgb4/qp.c: function c4iw_modify_qp line 146
drivers/infiniband/hw/cxgb4/qp.c: function c4iw_modify_qp line 195
drivers/infiniband/hw/cxgb4/qp.c: function c4iw_modify_qp line 200
drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c: function mcp251xfd_get_mode_str line 4
drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c: function mcp251xfd_get_mode_str line 6
drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c: function mcp251xfd_get_mode_str line 8
drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c: function mcp251xfd_get_mode_str line 10
drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c: function mcp251xfd_get_mode_str line 12
drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c: function mcp251xfd_get_mode_str line 14
drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c: function mcp251xfd_get_mode_str line 16
drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c: function mcp251xfd_get_mode_str line 18
drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c: function __mcp251xfd_get_model_str line 4
drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c: function __mcp251xfd_get_model_str line 6
drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c: function __mcp251xfd_get_model_str line 8
drivers/ata/libata-scsi.c: function ata_get_xlat_func line 35
drivers/char/ipmi/ipmi_devintf.c: function ipmi_ioctl line 201
arch/arm/nwfpe/fpa11_cprt.c: function EmulateCPRT line 15
arch/arm/nwfpe/fpa11_cprt.c: function EmulateCPRT line 18
drivers/vme/bridges/vme_ca91cx42.c: function ca91cx42_dma_list_add line 108
drivers/vme/bridges/vme_ca91cx42.c: function ca91cx42_master_set line 92
drivers/vme/bridges/vme_ca91cx42.c: function ca91cx42_master_set line 124
drivers/vme/bridges/vme_ca91cx42.c: function ca91cx42_slave_set line 39
drivers/vme/bridges/vme_ca91cx42.c: function ca91cx42_lm_set line 45
drivers/scsi/sym53c8xx_2/sym_hipd.c: function sym_int_sir line 230
drivers/gpu/drm/radeon/r300.c: function r300_packet0_check line 534
drivers/gpu/drm/amd/amdgpu/atombios_encoders.c: function amdgpu_atombios_encoder_get_encoder_mode line 70
drivers/gpu/drm/amd/amdgpu/atombios_encoders.c: function amdgpu_atombios_encoder_get_encoder_mode line 96
drivers/gpu/drm/amd/amdgpu/atombios_encoders.c: function amdgpu_atombios_encoder_get_encoder_mode line 103
drivers/media/dvb-frontends/si21xx.c: function si21xx_set_voltage line 15
drivers/media/dvb-frontends/si21xx.c: function si21xx_set_voltage line 18
drivers/staging/vme/devices/vme_user.c: function vme_user_ioctl line 75
drivers/staging/vme/devices/vme_user.c: function vme_user_ioctl line 119
drivers/mmc/host/atmel-mci.c: function atmci_tasklet_func line 197
drivers/irqchip/irq-mips-gic.c: function gic_ipi_domain_match line 9
drivers/staging/media/atomisp/pci/hive_isp_css_common/host/input_system.c: function input_buffer_configuration line 47
drivers/staging/media/atomisp/pci/hive_isp_css_common/host/input_system.c: function input_buffer_configuration line 84
drivers/staging/media/atomisp/pci/hive_isp_css_common/host/input_system.c: function input_system_configure_channel line 14
drivers/staging/media/atomisp/pci/hive_isp_css_common/host/input_system.c: function input_system_configure_channel line 17
drivers/staging/media/atomisp/pci/hive_isp_css_common/host/input_system.c: function input_system_configure_channel line 20
drivers/staging/media/atomisp/pci/hive_isp_css_common/host/input_system.c: function input_system_configure_channel line 23
drivers/staging/media/atomisp/pci/hive_isp_css_common/host/input_system.c: function configuration_to_registers line 83
drivers/staging/media/atomisp/pci/hive_isp_css_common/host/input_system.c: function input_system_configure_channel_sensor line 82
drivers/staging/media/atomisp/pci/hive_isp_css_common/host/input_system.c: function input_system_configure_channel_sensor line 85
drivers/staging/media/atomisp/pci/hive_isp_css_common/host/input_system.c: function input_system_configure_channel_sensor line 88
drivers/staging/media/atomisp/pci/hive_isp_css_common/host/input_system.c: function input_system_configure_channel_sensor line 91
drivers/net/ethernet/8390/mac8390.c: function mac8390_ident line 27
drivers/net/ethernet/8390/mac8390.c: function mac8390_ident line 42
drivers/irqchip/irq-crossbar.c: function crossbar_of_init line 100
drivers/mtd/devices/ms02-nv.c: function ms02nv_init line 21
arch/powerpc/platforms/cell/spufs/switch.c: function __do_spu_restore line 21
arch/powerpc/platforms/cell/spufs/switch.c: function __do_spu_save line 23
arch/powerpc/include/asm/kvm_book3s_64.h: function kvmppc_hpte_page_shifts line 11
arch/powerpc/include/asm/kvm_book3s_64.h: function kvmppc_hpte_page_shifts line 14
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arch/powerpc/include/asm/kvm_book3s_64.h: function kvmppc_hpte_page_shifts line 20
arch/x86/kernel/cpu/mce/core.c: function __mcheck_cpu_ancient_init line 10
arch/x86/kernel/cpu/mce/core.c: function __mcheck_cpu_ancient_init line 14
sound/pci/echoaudio/midi.c: function mtc_process_data line 10
sound/pci/echoaudio/midi.c: function mtc_process_data line 14
sound/pci/rme32.c: function snd_rme32_capture_getrate line 36
tools/power/acpi/tools/acpidbg/acpidbg.c: function main line 33
tools/power/acpi/tools/acpidbg/acpidbg.c: function main line 39
drivers/scsi/lpfc/lpfc_init.c: function lpfc_init_api_table_setup line 22
drivers/gpu/drm/amd/amdgpu/dce_v10_0.c: function dce_v10_0_pick_dig_encoder line 32
drivers/acpi/utils.c: function acpi_extract_package line 66
drivers/acpi/utils.c: function acpi_extract_package line 91
drivers/acpi/utils.c: function acpi_extract_package line 106
drivers/acpi/utils.c: function acpi_extract_package line 117
drivers/char/lp.c: function lp_do_ioctl line 48
drivers/mtd/mtdchar.c: function mtdchar_ioctl line 265
drivers/mtd/mtdchar.c: function mtdchar_ioctl line 276
arch/x86/kvm/emulate.c: function writeback line 26
drivers/usb/host/xhci-mem.c: function xhci_setup_addressable_virt_dev line 46
drivers/media/usb/tm6000/tm6000-core.c: function tm6000_set_audio_rinput line 26
drivers/media/usb/tm6000/tm6000-core.c: function tm6000_set_audio_rinput line 48
drivers/media/usb/tm6000/tm6000-core.c: function tm6000_tvaudio_set_mute line 26
drivers/media/dvb-frontends/dib0090.c: function dib0090_fw_identify line 79
drivers/media/dvb-frontends/dib0090.c: function dib0090_identify line 81
drivers/net/dsa/b53/b53_common.c: function b53_switch_init line 46
drivers/net/wireless/intel/iwlwifi/mvm/mac-ctxt.c: function iwl_mvm_mac_ctx_send line 9
drivers/gpu/drm/amd/display/dc/dcn21/dcn21_resource.c: function map_transmitter_id_to_phy_instance line 6
drivers/gpu/drm/amd/display/dc/dcn21/dcn21_resource.c: function map_transmitter_id_to_phy_instance line 9
drivers/gpu/drm/amd/display/dc/dcn21/dcn21_resource.c: function map_transmitter_id_to_phy_instance line 12
drivers/gpu/drm/amd/display/dc/dcn21/dcn21_resource.c: function map_transmitter_id_to_phy_instance line 15
drivers/gpu/drm/amd/display/dc/dcn21/dcn21_resource.c: function map_transmitter_id_to_phy_instance line 18
sound/soc/sh/hac.c: function hac_hw_params line 19
drivers/gpu/drm/radeon/atombios_encoders.c: function atombios_get_encoder_mode line 83
drivers/gpu/drm/radeon/atombios_encoders.c: function atombios_get_encoder_mode line 119
drivers/gpu/drm/radeon/atombios_encoders.c: function atombios_get_encoder_mode line 126
drivers/pci/controller/pci-v3-semi.c: function v3_get_dma_range_config line 64
drivers/video/fbdev/amifb.c: function amifb_probe line 90
drivers/video/fbdev/amifb.c: function ami_decode_var line 84
fs/efs/inode.c: function efs_iget line 120
drivers/vme/bridges/vme_tsi148.c: function tsi148_dma_list_add line 81
drivers/vme/bridges/vme_tsi148.c: function tsi148_dma_list_add line 119
drivers/vme/bridges/vme_tsi148.c: function tsi148_master_set line 191
drivers/vme/bridges/vme_tsi148.c: function tsi148_slave_set line 38
drivers/vme/bridges/vme_tsi148.c: function tsi148_dma_set_vme_dest_attributes line 87
drivers/vme/bridges/vme_tsi148.c: function tsi148_dma_set_vme_src_attributes line 87
drivers/vme/bridges/vme_tsi148.c: function tsi148_lm_set line 41
net/ipv4/fib_frontend.c: function fib_gw_from_via line 35
arch/arm/mach-s3c/mach-rx1950.c: function rx1950_led_blink_set line 17
tools/perf/ui/stdio/hist.c: function hist_entry_callchain__fprintf line 15
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tools/perf/ui/stdio/hist.c: function hist_entry_callchain__fprintf line 24
tools/perf/ui/stdio/hist.c: function hist_entry_callchain__fprintf line 27
drivers/usb/serial/iuu_phoenix.c: function iuu_uart_baud line 74
drivers/usb/serial/iuu_phoenix.c: function iuu_uart_baud line 88
drivers/gpu/drm/amd/amdgpu/dce_v8_0.c: function dce_v8_0_pick_dig_encoder line 32
drivers/net/hyperv/netvsc.c: function netvsc_process_raw_pkt line 19
drivers/gpu/drm/amd/display/dc/dcn20/dcn20_resource.c: function map_transmitter_id_to_phy_instance line 6
drivers/gpu/drm/amd/display/dc/dcn20/dcn20_resource.c: function map_transmitter_id_to_phy_instance line 9
drivers/gpu/drm/amd/display/dc/dcn20/dcn20_resource.c: function map_transmitter_id_to_phy_instance line 12
drivers/gpu/drm/amd/display/dc/dcn20/dcn20_resource.c: function map_transmitter_id_to_phy_instance line 15
drivers/gpu/drm/amd/display/dc/dcn20/dcn20_resource.c: function map_transmitter_id_to_phy_instance line 18
drivers/gpu/drm/amd/display/dc/dcn20/dcn20_resource.c: function map_transmitter_id_to_phy_instance line 21
drivers/cpufreq/e_powersaver.c: function eps_cpu_init line 55