Build regressions/improvements in v5.0-rc1

Build regressions/improvements in v5.0-rc1

[Geert Uytterhoeven]

Below is the list of build error/warning regressions/improvements in
v5.0-rc1[1] compared to v4.20[2].

Summarized:
  - build errors: +12/-4
  - build warnings: +405/-350

Happy fixing! ;-)

Thanks to the linux-next team for providing the build service.

[1] http://kisskb.ellerman.id.au/kisskb/branch/linus/head/bfeffd155283772bbe78c6a05dec7c0128ee500c/ (all 240 configs)
[2] http://kisskb.ellerman.id.au/kisskb/branch/linus/head/8fe28cb58bcb235034b64cbbb7550a8a43fd88be/ (all 240 configs)


*** ERRORS ***

12 error regressions:
  + /kisskb/src/arch/mips/generic/init.c: error: -ffunction-sections disabled; it makes profiling impossible [-Werror]:  => 1:0
  + /kisskb/src/arch/mips/generic/irq.c: error: -ffunction-sections disabled; it makes profiling impossible [-Werror]:  => 1:0
  + /kisskb/src/arch/mips/kernel/branch.c: error: -ffunction-sections disabled; it makes profiling impossible [-Werror]:  => 1:0
  + /kisskb/src/arch/mips/kernel/cmpxchg.c: error: -ffunction-sections disabled; it makes profiling impossible [-Werror]:  => 1:0
  + /kisskb/src/arch/mips/kernel/cpu-probe.c: error: -ffunction-sections disabled; it makes profiling impossible [-Werror]:  => 1:0
  + /kisskb/src/arch/mips/mm/cache.c: error: -ffunction-sections disabled; it makes profiling impossible [-Werror]:  => 1:0
  + /kisskb/src/arch/mips/mm/extable.c: error: -ffunction-sections disabled; it makes profiling impossible [-Werror]:  => 1:0
  + /kisskb/src/arch/mips/mm/fault.c: error: -ffunction-sections disabled; it makes profiling impossible [-Werror]:  => 1:0
  + /kisskb/src/arch/mips/net/bpf_jit.c: error: -ffunction-sections disabled; it makes profiling impossible [-Werror]:  => 1:0
  + arch/mips/vdso/vdso-image.c: error: -ffunction-sections disabled; it makes profiling impossible [-Werror]:  => 1:0
  + error: arch/sparc/kernel/head_32.o: relocation truncated to fit: R_SPARC_WDISP22 against `.init.text':  => (.head.text+0x5100), (.head.text+0x5040)
  + error: arch/sparc/kernel/head_32.o: relocation truncated to fit: R_SPARC_WDISP22 against symbol `leon_smp_cpu_startup' defined in .text section in arch/sparc/kernel/trampoline_32.o:  => (.init.text+0xa4)

4 error improvements:
  - /kisskb/src/arch/s390/kernel/nospec-branch.c: error: macro "memcpy" passed 6 arguments, but takes just 3: 130:61 => 
  - /kisskb/src/sound/pci/hda/patch_ca0132.c: error: implicit declaration of function 'pci_iomap' [-Werror=implicit-function-declaration]: 8800:3 => 
  - error: arch/sparc/kernel/.tmp_head_32.o: relocation truncated to fit: R_SPARC_WDISP22 against `.init.text': (.head.text+0x5040), (.head.text+0x5100) => 
  - error: arch/sparc/kernel/.tmp_head_32.o: relocation truncated to fit: R_SPARC_WDISP22 against symbol `leon_smp_cpu_startup' defined in .text section in arch/sparc/kernel/trampoline_32.o: (.init.text+0xa4) => 


*** WARNINGS ***

[Deleted 490 lines about "warning: -ffunction-sections disabled; it makes profiling impossible [enabled by default]" on {mips,powerpc}-all{mod,yes}config*]

405 warning regressions:
  + /kisskb/src/arch/s390/boot/mem_detect.c: warning: 'detect_memory' uses dynamic stack allocation [enabled by default]:  => 182:1
  + /kisskb/src/arch/s390/kernel/perf_cpum_sf.c: warning: 'perf_push_sample' uses dynamic stack allocation [enabled by default]:  => 1075:1
  + /kisskb/src/arch/um/kernel/skas/uaccess.c: warning: unused variable 'buf' [-Wunused-variable]:  => 62:10
  + /kisskb/src/drivers/atm/ambassador.c: warning: passing argument 1 of 'virt_to_bus' discards 'volatile' qualifier from pointer target type [enabled by default]:  => 1762:3
  + /kisskb/src/drivers/crypto/chelsio/chtls/chtls_cm.c: warning: 'wait_for_states.constprop.23' uses dynamic stack allocation [enabled by default]:  => 405:1
  + /kisskb/src/drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu_dm.c: warning: (near initialization for 'stream_update.src') [-Wmissing-braces]:  => 4576:9
  + /kisskb/src/drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu_dm.c: warning: missing braces around initializer [-Wmissing-braces]:  => 4576:9
  + /kisskb/src/drivers/net/ethernet/chelsio/cxgb4/cudbg_lib.c: warning: 'rc' may be used uninitialized in this function [-Wuninitialized]:  => 2962:6
  + /kisskb/src/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c: warning: overflow in implicit constant conversion [-Woverflow]:  => 551:41
  + /kisskb/src/drivers/net/ethernet/marvell/octeontx2/af/rvu_npc.c: warning: 'rc' may be used uninitialized in this function [-Wuninitialized]:  => 1815:15
  + /kisskb/src/drivers/net/ethernet/mellanox/mlx5/core/events.c: warning: 'error_str' may be used uninitialized in this function [-Wuninitialized]:  => 238:3
  + /kisskb/src/drivers/net/ethernet/neterion/vxge/vxge-config.c: warning: 'vxge_hw_device_hw_info_get' uses dynamic stack allocation [enabled by default]:  => 1089:1
  + /kisskb/src/drivers/net/veth.c: warning: 'veth_get_stats64' uses dynamic stack allocation [enabled by default]:  => 364:1
  + /kisskb/src/drivers/net/wan/lmc/lmc_main.c: warning: passing argument 1 of 'virt_to_bus' discards 'volatile' qualifier from pointer target type [enabled by default]:  => 1874:9, 1876:5, 1852:9, 1863:5, 1877:5, 1861:9
  + /kisskb/src/drivers/s390/net/ism_drv.c: warning: 'ism_add_vlan_id' uses dynamic stack allocation [enabled by default]:  => 311:1
  + /kisskb/src/drivers/s390/net/ism_drv.c: warning: 'ism_del_vlan_id' uses dynamic stack allocation [enabled by default]:  => 325:1
  + /kisskb/src/drivers/s390/net/ism_drv.c: warning: 'ism_dev_init' uses dynamic stack allocation [enabled by default]:  => 487:1
  + /kisskb/src/drivers/s390/net/ism_drv.c: warning: 'ism_query_rgid' uses dynamic stack allocation [enabled by default]:  => 209:1
  + /kisskb/src/drivers/s390/net/ism_drv.c: warning: 'ism_register_dmb' uses dynamic stack allocation [enabled by default]:  => 276:1
  + /kisskb/src/drivers/s390/net/ism_drv.c: warning: 'ism_signal_ieq' uses dynamic stack allocation [enabled by default]:  => 353:1
  + /kisskb/src/drivers/s390/net/ism_drv.c: warning: 'ism_unregister_dmb' uses dynamic stack allocation [enabled by default]:  => 297:1
  + /kisskb/src/drivers/s390/net/ism_drv.c: warning: 'query_info' uses dynamic stack allocation [enabled by default]:  => 84:1
  + /kisskb/src/drivers/s390/net/ism_drv.c: warning: 'register_ieq' uses dynamic stack allocation [enabled by default]:  => 140:1
  + /kisskb/src/drivers/s390/net/ism_drv.c: warning: 'register_sba' uses dynamic stack allocation [enabled by default]:  => 111:1
  + /kisskb/src/drivers/s390/scsi/zfcp_erp.c: warning: 'erp_action' may be used uninitialized in this function [-Wuninitialized]:  => 262:2
  + /kisskb/src/drivers/target/iscsi/cxgbit/cxgbit_target.c: warning: 'cxgbit_tx_datain_iso.isra.32' uses dynamic stack allocation [enabled by default]:  => 501:1
  + /kisskb/src/drivers/target/iscsi/iscsi_target.c: warning: 'iscsit_send_datain' uses dynamic stack allocation [enabled by default]:  => 2846:1
  + /kisskb/src/drivers/vfio/pci/vfio_pci_nvlink2.c: warning: (near initialization for 'cap.header') [-Wmissing-braces]:  => 181:9
  + /kisskb/src/drivers/vfio/pci/vfio_pci_nvlink2.c: warning: (near initialization for 'capspd.header') [-Wmissing-braces]:  => 369:9
  + /kisskb/src/drivers/vfio/pci/vfio_pci_nvlink2.c: warning: (near initialization for 'captgt.header') [-Wmissing-braces]:  => 368:9
  + /kisskb/src/drivers/vfio/pci/vfio_pci_nvlink2.c: warning: missing braces around initializer [-Wmissing-braces]:  => 368:9, 181:9, 369:9
  + /kisskb/src/fs/cifs/cifssmb.c: warning: the frame size of 1316 bytes is larger than 1280 bytes [-Wframe-larger-than=]:  => 186:1
  + /kisskb/src/fs/cifs/cifssmb.c: warning: the frame size of 1320 bytes is larger than 1024 bytes [-Wframe-larger-than=]:  => 186:1
  + /kisskb/src/fs/cifs/cifssmb.c: warning: the frame size of 1328 bytes is larger than 1024 bytes [-Wframe-larger-than=]:  => 186:1
  + /kisskb/src/fs/cifs/cifssmb.c: warning: the frame size of 1340 bytes is larger than 1024 bytes [-Wframe-larger-than=]:  => 186:1
  + /kisskb/src/fs/cifs/cifssmb.c: warning: the frame size of 1344 bytes is larger than 1024 bytes [-Wframe-larger-than=]:  => 186:1
  + /kisskb/src/fs/cifs/smb2pdu.c: warning: the frame size of 1316 bytes is larger than 1280 bytes [-Wframe-larger-than=]:  => 220:1
  + /kisskb/src/fs/cifs/smb2pdu.c: warning: the frame size of 1320 bytes is larger than 1024 bytes [-Wframe-larger-than=]:  => 220:1
  + /kisskb/src/fs/cifs/smb2pdu.c: warning: the frame size of 1328 bytes is larger than 1024 bytes [-Wframe-larger-than=]:  => 220:1
  + /kisskb/src/fs/cifs/smb2pdu.c: warning: the frame size of 1340 bytes is larger than 1024 bytes [-Wframe-larger-than=]:  => 220:1
  + /kisskb/src/fs/cifs/smb2pdu.c: warning: the frame size of 1344 bytes is larger than 1024 bytes [-Wframe-larger-than=]:  => 220:1
  + /kisskb/src/include/asm-generic/io.h: warning: 'px_cmd' may be used uninitialized in this function [-Wuninitialized]:  => 232:15
  + /kisskb/src/include/asm-generic/io.h: warning: 'px_is' may be used uninitialized in this function [-Wuninitialized]:  => 232:15
  + /kisskb/src/include/linux/skbuff.h: warning: 'extra_uref' may be used uninitialized in this function [-Wuninitialized]:  => 1338:6
  + /kisskb/src/include/linux/spinlock.h: warning: 'flags' may be used uninitialized in this function [-Wmaybe-uninitialized]:  => 279:3
  + /kisskb/src/kernel/bpf/verifier.c: warning: 'prev_offset' may be used uninitialized in this function [-Wmaybe-uninitialized]:  => 5030:4
  + /kisskb/src/kernel/dma/direct.c: warning: format '%zu' expects argument of type 'size_t', but argument 4 has type 'unsigned int' [-Wformat=]:  => 40:4
  + /kisskb/src/kernel/rcu/srcutree.c: warning: 'levelspread[<U 140>]' may be used uninitialized in this function [-Wuninitialized]:  => 133:34
  + /kisskb/src/kernel/rcu/srcutree.c: warning: 'levelspread[<U 320>]' may be used uninitialized in this function [-Wuninitialized]:  => 152:32
  + /kisskb/src/kernel/rcu/srcutree.c: warning: 'levelspread[<U 3c0>]' may be used uninitialized in this function [-Wuninitialized]:  => 133:34
  + /kisskb/src/kernel/rcu/srcutree.c: warning: 'levelspread[<U1780>]' may be used uninitialized in this function [-Wuninitialized]:  => 133:34
  + /kisskb/src/kernel/rcu/srcutree.c: warning: 'levelspread[<U21e0>]' may be used uninitialized in this function [-Wuninitialized]:  => 133:34
  + /kisskb/src/kernel/rcu/srcutree.c: warning: 'levelspread[<U23c0>]' may be used uninitialized in this function [-Wuninitialized]:  => 133:34
  + /kisskb/src/kernel/rcu/srcutree.c: warning: 'levelspread[<U2aa0>]' may be used uninitialized in this function [-Wuninitialized]:  => 133:34
  + /kisskb/src/kernel/rcu/srcutree.c: warning: 'levelspread[<U35a0>]' may be used uninitialized in this function [-Wuninitialized]:  => 133:34
  + /kisskb/src/kernel/rcu/srcutree.c: warning: 'levelspread[<U3be0>]' may be used uninitialized in this function [-Wuninitialized]:  => 133:34
  + /kisskb/src/kernel/rcu/srcutree.c: warning: 'levelspread[<U43c0>]' may be used uninitialized in this function [-Wuninitialized]:  => 133:34
  + /kisskb/src/kernel/rcu/srcutree.c: warning: 'levelspread[<U4aa0>]' may be used uninitialized in this function [-Wuninitialized]:  => 133:34
  + /kisskb/src/kernel/rcu/srcutree.c: warning: 'levelspread[<U4be0>]' may be used uninitialized in this function [-Wuninitialized]:  => 133:34
  + /kisskb/src/kernel/rcu/srcutree.c: warning: 'levelspread[<U4f00>]' may be used uninitialized in this function [-Wuninitialized]:  => 152:32
  + /kisskb/src/kernel/rcu/srcutree.c: warning: 'levelspread[<U53c0>]' may be used uninitialized in this function [-Wuninitialized]:  => 152:32
  + /kisskb/src/kernel/rcu/srcutree.c: warning: 'levelspread[<U6500>]' may be used uninitialized in this function [-Wuninitialized]:  => 152:32
  + /kisskb/src/kernel/rcu/srcutree.c: warning: 'levelspread[<U6960>]' may be used uninitialized in this function [-Wuninitialized]:  => 152:32
  + /kisskb/src/kernel/rcu/srcutree.c: warning: 'levelspread[<U6aa0>]' may be used uninitialized in this function [-Wuninitialized]:  => 133:34
  + /kisskb/src/kernel/rcu/srcutree.c: warning: 'levelspread[<U6dc0>]' may be used uninitialized in this function [-Wuninitialized]:  => 133:34
  + /kisskb/src/kernel/rcu/srcutree.c: warning: 'levelspread[<U75a0>]' may be used uninitialized in this function [-Wuninitialized]:  => 133:34
  + /kisskb/src/kernel/rcu/srcutree.c: warning: 'levelspread[<U78c0>]' may be used uninitialized in this function [-Wuninitialized]:  => 133:34
  + /kisskb/src/kernel/rcu/srcutree.c: warning: 'levelspread[<U7960>]' may be used uninitialized in this function [-Wuninitialized]:  => 133:34
  + /kisskb/src/kernel/rcu/srcutree.c: warning: 'levelspread[<U7dc0>]' may be used uninitialized in this function [-Wuninitialized]:  => 133:34
  + /kisskb/src/kernel/rcu/srcutree.c: warning: 'levelspread[<U8280>]' may be used uninitialized in this function [-Wuninitialized]:  => 133:34, 152:32
  + /kisskb/src/kernel/rcu/srcutree.c: warning: 'levelspread[<U83c0>]' may be used uninitialized in this function [-Wuninitialized]:  => 152:32
  + /kisskb/src/kernel/rcu/srcutree.c: warning: 'levelspread[<U8500>]' may be used uninitialized in this function [-Wuninitialized]:  => 152:32
  + /kisskb/src/kernel/rcu/srcutree.c: warning: 'levelspread[<U8dc0>]' may be used uninitialized in this function [-Wuninitialized]:  => 152:32
  + /kisskb/src/kernel/rcu/srcutree.c: warning: 'levelspread[<U9140>]' may be used uninitialized in this function [-Wuninitialized]:  => 133:34
  + /kisskb/src/kernel/rcu/srcutree.c: warning: 'levelspread[<U9320>]' may be used uninitialized in this function [-Wuninitialized]:  => 152:32
  + /kisskb/src/kernel/rcu/srcutree.c: warning: 'levelspread[<U9640>]' may be used uninitialized in this function [-Wuninitialized]:  => 152:32
  + /kisskb/src/kernel/rcu/srcutree.c: warning: 'levelspread[<U9780>]' may be used uninitialized in this function [-Wuninitialized]:  => 133:34
  + /kisskb/src/kernel/rcu/srcutree.c: warning: 'levelspread[<U9aa0>]' may be used uninitialized in this function [-Wuninitialized]:  => 152:32
  + /kisskb/src/kernel/rcu/srcutree.c: warning: 'levelspread[<U9b40>]' may be used uninitialized in this function [-Wuninitialized]:  => 133:34
  + /kisskb/src/kernel/rcu/srcutree.c: warning: 'levelspread[<Ua000>]' may be used uninitialized in this function [-Wuninitialized]:  => 133:34
  + /kisskb/src/kernel/rcu/srcutree.c: warning: 'levelspread[<Ua820>]' may be used uninitialized in this function [-Wuninitialized]:  => 133:34
  + /kisskb/src/kernel/rcu/srcutree.c: warning: 'levelspread[<Uad20>]' may be used uninitialized in this function [-Wuninitialized]:  => 152:32
  + /kisskb/src/kernel/rcu/srcutree.c: warning: 'levelspread[<Ub0a0>]' may be used uninitialized in this function [-Wuninitialized]: 133:33 => 133:34, 152:32
  + /kisskb/src/kernel/rcu/srcutree.c: warning: 'levelspread[<Ub320>]' may be used uninitialized in this function [-Wuninitialized]:  => 133:34
  + /kisskb/src/kernel/rcu/srcutree.c: warning: 'levelspread[<Ub5a0>]' may be used uninitialized in this function [-Wuninitialized]:  => 133:34
  + /kisskb/src/kernel/rcu/srcutree.c: warning: 'levelspread[<Ub820>]' may be used uninitialized in this function [-Wuninitialized]:  => 152:32
  + /kisskb/src/kernel/rcu/srcutree.c: warning: 'levelspread[<Ub960>]' may be used uninitialized in this function [-Wuninitialized]:  => 133:34
  + /kisskb/src/kernel/rcu/srcutree.c: warning: 'levelspread[<Uba00>]' may be used uninitialized in this function [-Wuninitialized]:  => 133:34
  + /kisskb/src/kernel/rcu/srcutree.c: warning: 'levelspread[<Ucb40>]' may be used uninitialized in this function [-Wuninitialized]:  => 152:32
  + /kisskb/src/kernel/rcu/srcutree.c: warning: 'levelspread[<Ud140>]' may be used uninitialized in this function [-Wuninitialized]:  => 152:32
  + /kisskb/src/kernel/rcu/srcutree.c: warning: 'levelspread[<Ud280>]' may be used uninitialized in this function [-Wuninitialized]:  => 133:34
  + /kisskb/src/kernel/rcu/srcutree.c: warning: 'levelspread[<Ud8c0>]' may be used uninitialized in this function [-Wuninitialized]:  => 133:34
  + /kisskb/src/kernel/rcu/srcutree.c: warning: 'levelspread[<Ue000>]' may be used uninitialized in this function [-Wuninitialized]:  => 133:34
  + /kisskb/src/kernel/rcu/srcutree.c: warning: 'levelspread[<Ue320>]' may be used uninitialized in this function [-Wuninitialized]:  => 152:32
  + /kisskb/src/kernel/rcu/srcutree.c: warning: 'levelspread[<Ue640>]' may be used uninitialized in this function [-Wuninitialized]:  => 133:34
  + /kisskb/src/kernel/rcu/srcutree.c: warning: 'levelspread[<Ue6e0>]' may be used uninitialized in this function [-Wuninitialized]:  => 152:32
  + /kisskb/src/kernel/rcu/srcutree.c: warning: 'levelspread[<Uec80>]' may be used uninitialized in this function [-Wuninitialized]:  => 152:32
  + /kisskb/src/kernel/rcu/srcutree.c: warning: 'levelspread[<Uee60>]' may be used uninitialized in this function [-Wuninitialized]:  => 133:34
  + /kisskb/src/kernel/rcu/srcutree.c: warning: 'levelspread[<Uf140>]' may be used uninitialized in this function [-Wuninitialized]:  => 133:34
  + /kisskb/src/kernel/rcu/srcutree.c: warning: 'levelspread[<Uf3c0>]' may be used uninitialized in this function [-Wuninitialized]:  => 133:34
  + /kisskb/src/kernel/rcu/srcutree.c: warning: 'levelspread[<Uf6e0>]' may be used uninitialized in this function [-Wuninitialized]:  => 133:34
  + /kisskb/src/kernel/trace/trace_dynevent.c: warning: 'ret' may be used uninitialized in this function [-Wuninitialized]:  => 89:5
  + /kisskb/src/lib/test_ubsan.c: warning: 'test_ubsan_out_of_bounds' uses dynamic stack allocation [enabled by default]:  => 67:1
  + /kisskb/src/lib/test_ubsan.c: warning: 'test_ubsan_vla_bound_not_positive' uses dynamic stack allocation [enabled by default]:  => 51:1
  + /kisskb/src/mm/slub.c: warning: 'deactivate_slab.isra.50' uses dynamic stack allocation [enabled by default]:  => 2167:1
  + /kisskb/src/mm/slub.c: warning: 'get_partial_node.isra.52' uses dynamic stack allocation [enabled by default]:  => 1874:1
  + /kisskb/src/mm/slub.c: warning: 'unfreeze_partials.isra.51' uses dynamic stack allocation [enabled by default]:  => 2235:1
  + /kisskb/src/net/bridge/br_device.c: warning: 'br_get_stats64' uses dynamic stack allocation [enabled by default]:  => 232:1
  + /kisskb/src/net/bridge/netfilter/ebtables.c: warning: 'compat_copy_everything_to_user' uses dynamic stack allocation [enabled by default]:  => 1906:1
  + /kisskb/src/net/sunrpc/stats.c: warning: 'rpc_clnt_show_stats' uses dynamic stack allocation [enabled by default]:  => 268:1
  + warning: unmet direct dependencies detected for PPC4xx_PCI_EXPRESS:  => N/A
  + warning: vmlinux.o(.text+0x2fad00): Section mismatch in reference from the function .devm_memremap_pages_release() to the function .meminit.text:.arch_remove_memory():  => N/A
  + warning: vmlinux.o(.text+0x2fb358): Section mismatch in reference from the function .devm_memremap_pages() to the function .meminit.text:.arch_add_memory():  => N/A
  + warning: vmlinux.o(.text+0x301d20): Section mismatch in reference from the function .devm_memremap_pages_release() to the function .meminit.text:.arch_remove_memory():  => N/A
  + warning: vmlinux.o(.text+0x302378): Section mismatch in reference from the function .devm_memremap_pages() to the function .meminit.text:.arch_add_memory():  => N/A
  + warning: vmlinux.o(.text+0x35d4): Section mismatch in reference from the variable __boot_from_prom to the function .init.text:prom_init():  => N/A
  + warning: vmlinux.o(.text+0x3776c0): Section mismatch in reference from the function .devm_memremap_pages_release() to the function .meminit.text:.arch_remove_memory():  => N/A
  + warning: vmlinux.o(.text+0x377d18): Section mismatch in reference from the function .devm_memremap_pages() to the function .meminit.text:.arch_add_memory():  => N/A

350 warning improvements:
  - /kisskb/src/arch/alpha/kernel/osf_sys.c: warning: unused variable 'err' [-Wunused-variable]: 563:11 => 
  - /kisskb/src/arch/alpha/kernel/osf_sys.c: warning: unused variable 'error' [-Wunused-variable]: 532:6 => 
  - /kisskb/src/arch/m68k/atari/config.c: warning: variable length array 'switches' is used [-Wvla]: 151:2 => 
  - /kisskb/src/arch/m68k/kernel/signal.c: warning: variable length array 'buf' is used [-Wvla]: 654:3 => 
  - /kisskb/src/arch/m68k/mvme147/config.c: warning: #warning check me! [-Wcpp]: 150:2 => 
  - /kisskb/src/arch/m68k/mvme16x/config.c: warning: #warning check me! [-Wcpp]: 397:2 => 
  - /kisskb/src/arch/mips/include/asm/sibyte/bcm1480_scd.h: warning: "M_SPC_CFG_CLEAR" redefined [enabled by default]: 274:0 => 
  - /kisskb/src/arch/mips/include/asm/sibyte/bcm1480_scd.h: warning: "M_SPC_CFG_ENABLE" redefined [enabled by default]: 275:0 => 
  - /kisskb/src/arch/powerpc/include/asm/io.h: warning: 'b' may be used uninitialized in this function [-Wuninitialized]: 159:1 => 
  - /kisskb/src/arch/powerpc/include/asm/io.h: warning: 'g' may be used uninitialized in this function [-Wuninitialized]: 159:1 => 
  - /kisskb/src/arch/powerpc/include/asm/io.h: warning: 'r' may be used uninitialized in this function [-Wuninitialized]: 159:1 => 
  - /kisskb/src/arch/s390/kernel/nospec-branch.c: warning: statement with no effect [-Wunused-value]: 130:3 => 
  - /kisskb/src/arch/sh/math-emu/math.c: warning: left shift count >= width of type [enabled by default]: 115:1, 108:1, 122:1, 334:2, 310:1, 145:2 => 310:1
  - /kisskb/src/arch/sh/math-emu/math.c: warning: left shift count is negative [enabled by default]: 115:1, 333:1, 81:1, 92:1, 323:2, 108:1, 122:1, 310:1, 129:1 => 
  - /kisskb/src/arch/sh/math-emu/math.c: warning: right shift count is negative [enabled by default]: 145:2, 294:3, 310:1, 129:1, 108:1, 324:2, 122:1, 334:2, 115:1 => 
  - /kisskb/src/arch/sh/math-emu/math.c: warning: statement with no effect [-Wunused-value]: 147:1, 296:1, 115:1, 294:1, 335:1, 122:1, 108:1, 324:1, 129:1 => 
  - /kisskb/src/drivers/block/paride/ppc6lnx.c: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]: 575:6, 217:2, 162:2, 144:2, 537:5, 147:2, 146:2, 235:4, 329:11, 430:15, 142:3, 560:4, 145:2, 201:2, 131:18, 266:4 => 
  - /kisskb/src/drivers/dma-buf/reservation.c: warning: 'i' may be used uninitialized in this function [-Wuninitialized]: 211:7 => 
  - /kisskb/src/drivers/dma-buf/reservation.c: warning: 'k' may be used uninitialized in this function [-Wuninitialized]: 208:36, 208:2, 156:1, 226:6 => 
  - /kisskb/src/drivers/gpu/drm/drm_info.c: warning: format '%zd' expects argument of type 'signed size_t', but argument 4 has type 'size_t {aka unsigned int}' [-Wformat=]: 118:24 => 
  - /kisskb/src/drivers/hwmon/sch56xx-common.c: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]: 145:2 => 
  - /kisskb/src/drivers/hwmon/smsc47b397.c: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]: 119:2 => 
  - /kisskb/src/drivers/iommu/io-pgtable-arm-v7s.c: warning: 'cptep' may be used uninitialized in this function [-Wuninitialized]: 438:7, 473:2 => 438:7
  - /kisskb/src/drivers/isdn/hardware/eicon/message.c: warning: the frame size of 2064 bytes is larger than 2048 bytes [-Wframe-larger-than=]: 5985:1 => 
  - /kisskb/src/drivers/isdn/hardware/eicon/message.c: warning: the frame size of 2096 bytes is larger than 2048 bytes [-Wframe-larger-than=]: 5985:1 => 
  - /kisskb/src/drivers/lightnvm/core.c: warning: 'ret' may be used uninitialized in this function [-Wuninitialized]: 977:6 => 
  - /kisskb/src/drivers/media/platform/fsl-viu.c: warning: "in_be32" redefined [enabled by default]: 42:0 => 
  - /kisskb/src/drivers/media/platform/fsl-viu.c: warning: "out_be32" redefined [enabled by default]: 41:0 => 
  - /kisskb/src/drivers/misc/altera-stapl/altera-lpt.c: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]: 40:9, 34:2 => 
  - /kisskb/src/drivers/net/ethernet/8390/lib8390.c: warning: '____alloc_ei_netdev' defined but not used [-Wunused-function]: 988:27 => 
  - /kisskb/src/drivers/net/ethernet/8390/lib8390.c: warning: '__ei_close' defined but not used [-Wunused-function]: 230:12 => 
  - /kisskb/src/drivers/net/ethernet/8390/lib8390.c: warning: '__ei_get_stats' defined but not used [-Wunused-function]: 850:33 => 
  - /kisskb/src/drivers/net/ethernet/8390/lib8390.c: warning: '__ei_open' defined but not used [-Wunused-function]: 201:12 => 
  - /kisskb/src/drivers/net/ethernet/8390/lib8390.c: warning: '__ei_poll' defined but not used [-Wunused-function]: 509:13 => 
  - /kisskb/src/drivers/net/ethernet/8390/lib8390.c: warning: '__ei_set_multicast_list' defined but not used [-Wunused-function]: 950:13 => 
  - /kisskb/src/drivers/net/ethernet/8390/lib8390.c: warning: '__ei_start_xmit' defined but not used [-Wunused-function]: 300:20 => 
  - /kisskb/src/drivers/net/ethernet/8390/lib8390.c: warning: '__ei_tx_timeout' defined but not used [-Wunused-function]: 254:13 => 
  - /kisskb/src/drivers/net/ethernet/8390/wd.c: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]: 296:4, 289:4 => 
  - /kisskb/src/drivers/net/ethernet/broadcom/bnxt/bnxt.h: warning: "writeq" redefined [enabled by default]: 1631:0 => 
  - /kisskb/src/drivers/net/ethernet/broadcom/bnxt/bnxt.h: warning: "writeq_relaxed" redefined [enabled by default]: 1639:0 => 
  - /kisskb/src/drivers/net/ethernet/freescale/fec_main.c: warning: unused variable 'pdata' [-Wunused-variable]: 1640:28 => 
  - /kisskb/src/drivers/net/ethernet/freescale/fec_main.c: warning: unused variable 'val' [-Wunused-variable]: 912:6 => 
  - /kisskb/src/drivers/net/ethernet/i825xx/sun3_82586.c: warning: array subscript is above array bounds [-Warray-bounds]: 993:89 => 
  - /kisskb/src/drivers/net/ethernet/mellanox/mlx5/core/en_stats.c: warning: the frame size of 1248 bytes is larger than 1024 bytes [-Wframe-larger-than=]: 216:1 => 
  - /kisskb/src/drivers/net/macsec.c: warning: 'assoc_num' may be used uninitialized in this function [-Wuninitialized]: 2068:5, 1926:2, 2003:2 => 
  - /kisskb/src/drivers/net/macsec.c: warning: 'rx_sc' may be used uninitialized in this function [-Wuninitialized]: 1926:2 => 
  - /kisskb/src/drivers/net/macsec.c: warning: 'secy' may be used uninitialized in this function [-Wuninitialized]: 2069:21 => 
  - /kisskb/src/drivers/net/macsec.c: warning: 'tx_sc' may be used uninitialized in this function [-Wuninitialized]: 2003:2, 2068:24 => 
  - /kisskb/src/drivers/net/tun.c: warning: 'linear' may be used uninitialized in this function [-Wuninitialized]: 1733:46, 1513:31, 1513:34 => 1533:34, 1753:46
  - /kisskb/src/drivers/net/usb/rtl8150.c: warning: "RSR" redefined: 30:0 => 
  - /kisskb/src/drivers/net/wireless/quantenna/qtnfmac/commands.c: warning: 'resp' may be used uninitialized in this function [-Wmaybe-uninitialized]: 133:54 => 
  - /kisskb/src/drivers/net/wireless/quantenna/qtnfmac/commands.c: warning: 'resp' may be used uninitialized in this function [-Wuninitialized]: 133:38 => 
  - /kisskb/src/drivers/nvme/host/lightnvm.c: warning: 'ret' may be used uninitialized in this function [-Wuninitialized]: 580:6 => 
  - /kisskb/src/drivers/scsi/esas2r/esas2r_ioctl.c: warning: 'dma_addr' may be used uninitialized in this function [-Wmaybe-uninitialized]: 1910:19 => 
  - /kisskb/src/drivers/scsi/imm.c: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]: 467:2, 305:3, 465:2, 461:2, 494:2, 341:15, 463:2, 247:2, 473:2, 303:3, 486:2, 563:2, 470:2 => 
  - /kisskb/src/drivers/scsi/ppa.c: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]: 436:2, 245:3, 379:2, 399:2, 439:2, 257:15 => 
  - /kisskb/src/drivers/scsi/sym53c8xx_2/sym_defs.h: warning: "WSR" redefined: 109:0 => 
  - /kisskb/src/drivers/spi/spi-sh-msiof.c: warning: "STR" redefined [enabled by default]: 74:0 => 
  - /kisskb/src/drivers/tty/rocket_int.h: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]: 68:9, 73:9, 46:2, 54:2 => 
  - /kisskb/src/fs/btrfs/qgroup.c: warning: array subscript is below array bounds [-Warray-bounds]: 1710:17, 1709:18 => 
  - /kisskb/src/fs/nfs/nfs3acl.c: warning: value computed is not used [-Wunused-value]: 44:2 => 
  - /kisskb/src/fs/posix_acl.c: warning: value computed is not used [-Wunused-value]: 147:3 => 
  - /kisskb/src/fs/reiserfs/stree.c: warning: the frame size of 1052 bytes is larger than 1024 bytes [-Wframe-larger-than=]: 812:1 => 
  - /kisskb/src/include/linux/mtd/onenand.h: warning: 'struct mtd_oob_ops' declared inside parameter list [enabled by default]: 225:12 => 
  - /kisskb/src/include/linux/mtd/onenand.h: warning: its scope is only this definition or declaration, which is probably not what you want [enabled by default]: 225:12 => 
  - /kisskb/src/include/linux/unaligned/le_byteshift.h: warning: array subscript is above array bounds [-Warray-bounds]: 26:7 => 
  - /kisskb/src/include/net/sock.h: warning: 'sk' may be used uninitialized in this function [-Wuninitialized]: 1928:19 => 
  - /kisskb/src/kernel/acct.c: warning: value computed is not used [-Wunused-value]: 177:2 => 
  - /kisskb/src/kernel/dma/direct.c: warning: format '%zu' expects argument of type 'size_t', but argument 5 has type 'unsigned int' [-Wformat=]: 47:5 => 
  - /kisskb/src/kernel/rcu/srcutree.c: warning: 'levelspread[<U   0>]' may be used uninitialized in this function [-Wuninitialized]: 152:32 => 
  - /kisskb/src/kernel/rcu/srcutree.c: warning: 'levelspread[<U 1e0>]' may be used uninitialized in this function [-Wuninitialized]: 152:32 => 
  - /kisskb/src/kernel/rcu/srcutree.c: warning: 'levelspread[<U dc0>]' may be used uninitialized in this function [-Wuninitialized]: 133:33 => 
  - /kisskb/src/kernel/rcu/srcutree.c: warning: 'levelspread[<U1000>]' may be used uninitialized in this function [-Wuninitialized]: 133:33 => 
  - /kisskb/src/kernel/rcu/srcutree.c: warning: 'levelspread[<U1320>]' may be used uninitialized in this function [-Wuninitialized]: 133:33 => 
  - /kisskb/src/kernel/rcu/srcutree.c: warning: 'levelspread[<U1a00>]' may be used uninitialized in this function [-Wuninitialized]: 152:32 => 
  - /kisskb/src/kernel/rcu/srcutree.c: warning: 'levelspread[<U1e60>]' may be used uninitialized in this function [-Wuninitialized]: 133:33 => 
  - /kisskb/src/kernel/rcu/srcutree.c: warning: 'levelspread[<U2e60>]' may be used uninitialized in this function [-Wuninitialized]: 133:33 => 
  - /kisskb/src/kernel/rcu/srcutree.c: warning: 'levelspread[<U31e0>]' may be used uninitialized in this function [-Wuninitialized]: 152:32 => 
  - /kisskb/src/kernel/rcu/srcutree.c: warning: 'levelspread[<U3460>]' may be used uninitialized in this function [-Wuninitialized]: 133:33 => 
  - /kisskb/src/kernel/rcu/srcutree.c: warning: 'levelspread[<U3500>]' may be used uninitialized in this function [-Wuninitialized]: 152:32, 133:33 => 152:32
  - /kisskb/src/kernel/rcu/srcutree.c: warning: 'levelspread[<U3b40>]' may be used uninitialized in this function [-Wuninitialized]: 133:33 => 
  - /kisskb/src/kernel/rcu/srcutree.c: warning: 'levelspread[<U3d20>]' may be used uninitialized in this function [-Wuninitialized]: 133:33 => 
  - /kisskb/src/kernel/rcu/srcutree.c: warning: 'levelspread[<U4140>]' may be used uninitialized in this function [-Wuninitialized]: 133:33 => 
  - /kisskb/src/kernel/rcu/srcutree.c: warning: 'levelspread[<U41e0>]' may be used uninitialized in this function [-Wuninitialized]: 152:32 => 
  - /kisskb/src/kernel/rcu/srcutree.c: warning: 'levelspread[<U4820>]' may be used uninitialized in this function [-Wuninitialized]: 133:33 => 
  - /kisskb/src/kernel/rcu/srcutree.c: warning: 'levelspread[<U50a0>]' may be used uninitialized in this function [-Wuninitialized]: 133:33 => 
  - /kisskb/src/kernel/rcu/srcutree.c: warning: 'levelspread[<U5dc0>]' may be used uninitialized in this function [-Wuninitialized]: 133:33 => 
  - /kisskb/src/kernel/rcu/srcutree.c: warning: 'levelspread[<U61e0>]' may be used uninitialized in this function [-Wuninitialized]: 133:33 => 
  - /kisskb/src/kernel/rcu/srcutree.c: warning: 'levelspread[<U63c0>]' may be used uninitialized in this function [-Wuninitialized]: 152:32 => 
  - /kisskb/src/kernel/rcu/srcutree.c: warning: 'levelspread[<U6460>]' may be used uninitialized in this function [-Wuninitialized]: 133:33 => 
  - /kisskb/src/kernel/rcu/srcutree.c: warning: 'levelspread[<U6f00>]' may be used uninitialized in this function [-Wuninitialized]: 133:33 => 
  - /kisskb/src/kernel/rcu/srcutree.c: warning: 'levelspread[<U7000>]' may be used uninitialized in this function [-Wuninitialized]: 152:32 => 
  - /kisskb/src/kernel/rcu/srcutree.c: warning: 'levelspread[<U7aa0>]' may be used uninitialized in this function [-Wuninitialized]: 152:32 => 
  - /kisskb/src/kernel/rcu/srcutree.c: warning: 'levelspread[<U7d20>]' may be used uninitialized in this function [-Wuninitialized]: 133:33 => 
  - /kisskb/src/kernel/rcu/srcutree.c: warning: 'levelspread[<U8000>]' may be used uninitialized in this function [-Wuninitialized]: 133:33 => 
  - /kisskb/src/kernel/rcu/srcutree.c: warning: 'levelspread[<U8460>]' may be used uninitialized in this function [-Wuninitialized]: 133:33 => 
  - /kisskb/src/kernel/rcu/srcutree.c: warning: 'levelspread[<U8d20>]' may be used uninitialized in this function [-Wuninitialized]: 133:33 => 
  - /kisskb/src/kernel/rcu/srcutree.c: warning: 'levelspread[<U9460>]' may be used uninitialized in this function [-Wuninitialized]: 133:33 => 
  - /kisskb/src/kernel/rcu/srcutree.c: warning: 'levelspread[<U95a0>]' may be used uninitialized in this function [-Wuninitialized]: 152:32 => 
  - /kisskb/src/kernel/rcu/srcutree.c: warning: 'levelspread[<U96e0>]' may be used uninitialized in this function [-Wuninitialized]: 133:33 => 
  - /kisskb/src/kernel/rcu/srcutree.c: warning: 'levelspread[<U9820>]' may be used uninitialized in this function [-Wuninitialized]: 133:33 => 
  - /kisskb/src/kernel/rcu/srcutree.c: warning: 'levelspread[<U9960>]' may be used uninitialized in this function [-Wuninitialized]: 152:32 => 
  - /kisskb/src/kernel/rcu/srcutree.c: warning: 'levelspread[<U9d20>]' may be used uninitialized in this function [-Wuninitialized]: 133:33 => 
  - /kisskb/src/kernel/rcu/srcutree.c: warning: 'levelspread[<U9dc0>]' may be used uninitialized in this function [-Wuninitialized]: 152:32 => 
  - /kisskb/src/kernel/rcu/srcutree.c: warning: 'levelspread[<Ua320>]' may be used uninitialized in this function [-Wuninitialized]: 133:33 => 
  - /kisskb/src/kernel/rcu/srcutree.c: warning: 'levelspread[<Ua640>]' may be used uninitialized in this function [-Wuninitialized]: 152:32 => 
  - /kisskb/src/kernel/rcu/srcutree.c: warning: 'levelspread[<Ub640>]' may be used uninitialized in this function [-Wuninitialized]: 152:32 => 
  - /kisskb/src/kernel/rcu/srcutree.c: warning: 'levelspread[<Uc960>]' may be used uninitialized in this function [-Wuninitialized]: 152:32 => 
  - /kisskb/src/kernel/rcu/srcutree.c: warning: 'levelspread[<Uda00>]' may be used uninitialized in this function [-Wuninitialized]: 152:32 => 
  - /kisskb/src/kernel/rcu/srcutree.c: warning: 'levelspread[<Ue3c0>]' may be used uninitialized in this function [-Wuninitialized]: 152:32 => 
  - /kisskb/src/kernel/rcu/srcutree.c: warning: 'levelspread[<Ue780>]' may be used uninitialized in this function [-Wuninitialized]: 133:33 => 
  - /kisskb/src/kernel/rcu/srcutree.c: warning: 'levelspread[<Ue960>]' may be used uninitialized in this function [-Wuninitialized]: 133:33 => 
  - /kisskb/src/kernel/rcu/srcutree.c: warning: 'levelspread[<Ueaa0>]' may be used uninitialized in this function [-Wuninitialized]: 133:33 => 
  - /kisskb/src/kernel/rcu/srcutree.c: warning: 'levelspread[<Ued20>]' may be used uninitialized in this function [-Wuninitialized]: 133:33 => 
  - /kisskb/src/kernel/rcu/srcutree.c: warning: 'levelspread[<Uf000>]' may be used uninitialized in this function [-Wuninitialized]: 133:33 => 
  - /kisskb/src/kernel/rcu/srcutree.c: warning: 'levelspread[<Uf0a0>]' may be used uninitialized in this function [-Wuninitialized]: 133:33 => 
  - /kisskb/src/kernel/rcu/srcutree.c: warning: 'levelspread[<Uf1e0>]' may be used uninitialized in this function [-Wuninitialized]: 133:33 => 
  - /kisskb/src/kernel/rcu/srcutree.c: warning: 'levelspread[<Uf280>]' may be used uninitialized in this function [-Wuninitialized]: 133:33 => 
  - /kisskb/src/kernel/rcu/srcutree.c: warning: 'levelspread[<Uf820>]' may be used uninitialized in this function [-Wuninitialized]: 152:32 => 
  - /kisskb/src/kernel/rcu/srcutree.c: warning: 'levelspread[<Ufdc0>]' may be used uninitialized in this function [-Wuninitialized]: 133:33 => 
  - /kisskb/src/lib/test_kasan.c: warning: the frame size of 1040 bytes is larger than 1024 bytes [-Wframe-larger-than=]: 504:1 => 
  - /kisskb/src/mm/memcontrol.c: warning: value computed is not used [-Wunused-value]: 1047:5 => 
  - /kisskb/src/mm/slub.c: warning: 'deactivate_slab.isra.37' uses dynamic stack allocation [enabled by default]: 2170:1 => 
  - /kisskb/src/mm/slub.c: warning: 'get_partial_node.isra.39' uses dynamic stack allocation [enabled by default]: 1870:1 => 
  - /kisskb/src/mm/slub.c: warning: 'unfreeze_partials.isra.38' uses dynamic stack allocation [enabled by default]: 2238:1 => 
  - /kisskb/src/net/core/filter.c: warning: value computed is not used [-Wunused-value]: 3304:4 => 
  - /kisskb/src/net/core/rtnetlink.c: warning: the frame size of 1248 bytes is larger than 1024 bytes [-Wframe-larger-than=]: 3224:1 => 
  - /kisskb/src/net/core/rtnetlink.c: warning: the frame size of 1296 bytes is larger than 1024 bytes [-Wframe-larger-than=]: 3224:1 => 
  - /kisskb/src/net/ncsi/ncsi-manage.c: warning: 'vid' may be used uninitialized in this function [-Wuninitialized]: 626:5, 641:19 => 676:19
  - /kisskb/src/sound/pci/hda/patch_ca0132.c: warning: assignment makes pointer from integer without a cast [enabled by default]: 8800:18 => 
  - /kisskb/src/sound/soc/codecs/wm9712.c: warning: 'regmap' may be used uninitialized in this function [-Wuninitialized]: 666:31 => 
  - warning: There are too many unreachable loose objects; run 'git prune' to remove them.: N/A => 
  - warning: vmlinux.o(.text+0x2f160c): Section mismatch in reference from the function .devm_memremap_pages() to the function .meminit.text:.arch_add_memory(): N/A => 
  - warning: vmlinux.o(.text+0x2f1de4): Section mismatch in reference from the function .devm_memremap_pages_release() to the function .meminit.text:.arch_remove_memory(): N/A => 
  - warning: vmlinux.o(.text+0x2f86ac): Section mismatch in reference from the function .devm_memremap_pages() to the function .meminit.text:.arch_add_memory(): N/A => 
  - warning: vmlinux.o(.text+0x2f8e84): Section mismatch in reference from the function .devm_memremap_pages_release() to the function .meminit.text:.arch_remove_memory(): N/A => 
  - warning: vmlinux.o(.text+0x335f0): Section mismatch in reference from the function setup_scache() to the function .init.text:loongson3_sc_init(): N/A => 
  - warning: vmlinux.o(.text+0x35c4): Section mismatch in reference from the variable __boot_from_prom to the function .init.text:prom_init(): N/A => 
  - warning: vmlinux.o(.text+0x36c93c): Section mismatch in reference from the function .devm_memremap_pages() to the function .meminit.text:.arch_add_memory(): N/A => 
  - warning: vmlinux.o(.text+0x36d114): Section mismatch in reference from the function .devm_memremap_pages_release() to the function .meminit.text:.arch_remove_memory(): N/A => 
  - warning: vmlinux.o(.text+0x37ee4): Section mismatch in reference from the function mips_sc_init() to the function .init.text:mips_sc_probe_cm3(): N/A => 
  - warning: vmlinux.o(.text+0x42402c): Section mismatch in reference from the function .hmm_devmem_release() to the function .meminit.text:.arch_remove_memory(): N/A => 
  - warning: vmlinux.o(.text+0x424318): Section mismatch in reference from the function .hmm_devmem_pages_create() to the function .meminit.text:.arch_add_memory(): N/A => 
  - warning: vmlinux.o(.text+0x42b78c): Section mismatch in reference from the function .hmm_devmem_release() to the function .meminit.text:.arch_remove_memory(): N/A => 
  - warning: vmlinux.o(.text+0x42ba78): Section mismatch in reference from the function .hmm_devmem_pages_create() to the function .meminit.text:.arch_add_memory(): N/A => 
  - warning: vmlinux.o(.text+0x4a66ac): Section mismatch in reference from the function .hmm_devmem_release() to the function .meminit.text:.arch_remove_memory(): N/A => 
  - warning: vmlinux.o(.text+0x4a6998): Section mismatch in reference from the function .hmm_devmem_pages_create() to the function .meminit.text:.arch_add_memory(): N/A => 

Gr{oetje,eeting}s,

						Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
							    -- Linus Torvalds

Re: Build regressions/improvements in v5.0-rc1

[Geert Uytterhoeven]

On Tue, Jan 8, 2019 at 9:49 AM Geert Uytterhoeven <geert@linux-m68k.org> wrote:
> Below is the list of build error/warning regressions/improvements in
> v5.0-rc1[1] compared to v4.20[2].
>
> Summarized:
>   - build errors: +12/-4
>   - build warnings: +405/-350
>
> Happy fixing! ;-)
>
> Thanks to the linux-next team for providing the build service.
>
> [1] http://kisskb.ellerman.id.au/kisskb/branch/linus/head/bfeffd155283772bbe78c6a05dec7c0128ee500c/ (all 240 configs)
> [2] http://kisskb.ellerman.id.au/kisskb/branch/linus/head/8fe28cb58bcb235034b64cbbb7550a8a43fd88be/ (all 240 configs)
>
>
> *** ERRORS ***
>
> 12 error regressions:
>   + /kisskb/src/arch/mips/generic/init.c: error: -ffunction-sections disabled; it makes profiling impossible [-Werror]:  => 1:0
>   + /kisskb/src/arch/mips/generic/irq.c: error: -ffunction-sections disabled; it makes profiling impossible [-Werror]:  => 1:0
>   + /kisskb/src/arch/mips/kernel/branch.c: error: -ffunction-sections disabled; it makes profiling impossible [-Werror]:  => 1:0
>   + /kisskb/src/arch/mips/kernel/cmpxchg.c: error: -ffunction-sections disabled; it makes profiling impossible [-Werror]:  => 1:0
>   + /kisskb/src/arch/mips/kernel/cpu-probe.c: error: -ffunction-sections disabled; it makes profiling impossible [-Werror]:  => 1:0
>   + /kisskb/src/arch/mips/mm/cache.c: error: -ffunction-sections disabled; it makes profiling impossible [-Werror]:  => 1:0
>   + /kisskb/src/arch/mips/mm/extable.c: error: -ffunction-sections disabled; it makes profiling impossible [-Werror]:  => 1:0
>   + /kisskb/src/arch/mips/mm/fault.c: error: -ffunction-sections disabled; it makes profiling impossible [-Werror]:  => 1:0
>   + /kisskb/src/arch/mips/net/bpf_jit.c: error: -ffunction-sections disabled; it makes profiling impossible [-Werror]:  => 1:0
>   + arch/mips/vdso/vdso-image.c: error: -ffunction-sections disabled; it makes profiling impossible [-Werror]:  => 1:0

mips-allmodconfig

These are even more annoying than on powerpc, as mips enables -Werror for
arch/mips/ :-(
Can this be avoided, e.g. by making LD_DEAD_CODE_DATA_ELIMINATION and
profiling mutually exclusive?

>   + error: arch/sparc/kernel/head_32.o: relocation truncated to fit: R_SPARC_WDISP22 against `.init.text':  => (.head.text+0x5100), (.head.text+0x5040)
>   + error: arch/sparc/kernel/head_32.o: relocation truncated to fit: R_SPARC_WDISP22 against symbol `leon_smp_cpu_startup' defined in .text section in arch/sparc/kernel/trampoline_32.o:  => (.init.text+0xa4)

Same as before, just a different signature.

> 4 error improvements:
>   - /kisskb/src/arch/s390/kernel/nospec-branch.c: error: macro "memcpy" passed 6 arguments, but takes just 3: 130:61 =>
>   - /kisskb/src/sound/pci/hda/patch_ca0132.c: error: implicit declaration of function 'pci_iomap' [-Werror=implicit-function-declaration]: 8800:3 =>
>   - error: arch/sparc/kernel/.tmp_head_32.o: relocation truncated to fit: R_SPARC_WDISP22 against `.init.text': (.head.text+0x5040), (.head.text+0x5100) =>
>   - error: arch/sparc/kernel/.tmp_head_32.o: relocation truncated to fit: R_SPARC_WDISP22 against symbol `leon_smp_cpu_startup' defined in .text section in arch/sparc/kernel/trampoline_32.o: (.init.text+0xa4) =>
>
>
> *** WARNINGS ***
>
> [Deleted 490 lines about "warning: -ffunction-sections disabled; it makes profiling impossible [enabled by default]" on {mips,powerpc}-all{mod,yes}config*]

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds

[PATCH] kbuild: Disable LD_DEAD_CODE_DATA_ELIMINATION with ftrace & GCC <= 4.7

[Paul Burton]

When building using GCC 4.7 or older, -ffunction-sections & the -pg flag
used by ftrace are incompatible. This causes warnings or build failures
(where -Werror applies) such as the following:

  arch/mips/generic/init.c:
    error: -ffunction-sections disabled; it makes profiling impossible

This used to be taken into account by the ordering of calls to cc-option
from within the top-level Makefile, which was introduced by commit
90ad4052e85c ("kbuild: avoid conflict between -ffunction-sections and
-pg on gcc-4.7"). Unfortunately this was broken when the
CONFIG_LD_DEAD_CODE_DATA_ELIMINATION cc-option check was moved to
Kconfig in commit e85d1d65cd8a ("kbuild: test dead code/data elimination
support in Kconfig"), because the flags used by this check no longer
include -pg.

Fix this by not allowing CONFIG_LD_DEAD_CODE_DATA_ELIMINATION to be
enabled at the same time as ftrace/CONFIG_FUNCTION_TRACER when building
using GCC 4.7 or older.

Signed-off-by: Paul Burton <paul.burton@mips.com>
Fixes: e85d1d65cd8a ("kbuild: test dead code/data elimination support in Kconfig")
Reported-by: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Masahiro Yamada <yamada.masahiro@socionext.com>
Cc: Nicholas Piggin <npiggin@gmail.com>
Cc: stable@vger.kernel.org # v4.19+
---
 init/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/init/Kconfig b/init/Kconfig
index d47cb77a220e..c787f782148d 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -1124,6 +1124,7 @@ config LD_DEAD_CODE_DATA_ELIMINATION
 	bool "Dead code and data elimination (EXPERIMENTAL)"
 	depends on HAVE_LD_DEAD_CODE_DATA_ELIMINATION
 	depends on EXPERT
+	depends on !FUNCTION_TRACER || !CC_IS_GCC || GCC_VERSION >= 40800
 	depends on $(cc-option,-ffunction-sections -fdata-sections)
 	depends on $(ld-option,--gc-sections)
 	help
-- 
2.20.1

Re: [PATCH] kbuild: Disable LD_DEAD_CODE_DATA_ELIMINATION with ftrace & GCC <= 4.7

[Masahiro Yamada]

On Thu, Jan 10, 2019 at 8:16 AM Paul Burton <paul.burton@mips.com> wrote:
>
> When building using GCC 4.7 or older, -ffunction-sections & the -pg flag
> used by ftrace are incompatible. This causes warnings or build failures
> (where -Werror applies) such as the following:
>
>   arch/mips/generic/init.c:
>     error: -ffunction-sections disabled; it makes profiling impossible
>
> This used to be taken into account by the ordering of calls to cc-option
> from within the top-level Makefile, which was introduced by commit
> 90ad4052e85c ("kbuild: avoid conflict between -ffunction-sections and
> -pg on gcc-4.7"). Unfortunately this was broken when the
> CONFIG_LD_DEAD_CODE_DATA_ELIMINATION cc-option check was moved to
> Kconfig in commit e85d1d65cd8a ("kbuild: test dead code/data elimination
> support in Kconfig"), because the flags used by this check no longer
> include -pg.
>
> Fix this by not allowing CONFIG_LD_DEAD_CODE_DATA_ELIMINATION to be
> enabled at the same time as ftrace/CONFIG_FUNCTION_TRACER when building
> using GCC 4.7 or older.
>
> Signed-off-by: Paul Burton <paul.burton@mips.com>
> Fixes: e85d1d65cd8a ("kbuild: test dead code/data elimination support in Kconfig")
> Reported-by: Geert Uytterhoeven <geert@linux-m68k.org>
> Cc: Masahiro Yamada <yamada.masahiro@socionext.com>
> Cc: Nicholas Piggin <npiggin@gmail.com>
> Cc: stable@vger.kernel.org # v4.19+
> ---
>  init/Kconfig | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/init/Kconfig b/init/Kconfig
> index d47cb77a220e..c787f782148d 100644
> --- a/init/Kconfig
> +++ b/init/Kconfig
> @@ -1124,6 +1124,7 @@ config LD_DEAD_CODE_DATA_ELIMINATION
>         bool "Dead code and data elimination (EXPERIMENTAL)"
>         depends on HAVE_LD_DEAD_CODE_DATA_ELIMINATION
>         depends on EXPERT
> +       depends on !FUNCTION_TRACER || !CC_IS_GCC || GCC_VERSION >= 40800
>         depends on $(cc-option,-ffunction-sections -fdata-sections)
>         depends on $(ld-option,--gc-sections)
>         help


Thanks for the fix.

I prefer this explicit 'depends on'.

Relying on the order of $(call cc-option, ...) in Makefile is fragile.

We raise the compiler minimum version from time to time.
So, this 'depends on' will eventually go away in the future.


BTW, which one do you think more readable?


depends on !FUNCTION_TRACER || !CC_IS_GCC || GCC_VERSION >= 40800

    OR

depends on !(FUNCTION_TRACER && CC_IS_GCC && GCC_VERSION < 40800)


-- 
Best Regards
Masahiro Yamada

Re: [PATCH] kbuild: Disable LD_DEAD_CODE_DATA_ELIMINATION with ftrace & GCC <= 4.7

[Paul Burton]

Hi Masahiro,

On Thu, Jan 10, 2019 at 11:00:49AM +0900, Masahiro Yamada wrote:
> On Thu, Jan 10, 2019 at 8:16 AM Paul Burton <paul.burton@mips.com> wrote:
> > When building using GCC 4.7 or older, -ffunction-sections & the -pg flag
> > used by ftrace are incompatible. This causes warnings or build failures
> > (where -Werror applies) such as the following:
> >
> >   arch/mips/generic/init.c:
> >     error: -ffunction-sections disabled; it makes profiling impossible
> >
> > This used to be taken into account by the ordering of calls to cc-option
> > from within the top-level Makefile, which was introduced by commit
> > 90ad4052e85c ("kbuild: avoid conflict between -ffunction-sections and
> > -pg on gcc-4.7"). Unfortunately this was broken when the
> > CONFIG_LD_DEAD_CODE_DATA_ELIMINATION cc-option check was moved to
> > Kconfig in commit e85d1d65cd8a ("kbuild: test dead code/data elimination
> > support in Kconfig"), because the flags used by this check no longer
> > include -pg.
> >
> > Fix this by not allowing CONFIG_LD_DEAD_CODE_DATA_ELIMINATION to be
> > enabled at the same time as ftrace/CONFIG_FUNCTION_TRACER when building
> > using GCC 4.7 or older.
> >
> > Signed-off-by: Paul Burton <paul.burton@mips.com>
> > Fixes: e85d1d65cd8a ("kbuild: test dead code/data elimination support in Kconfig")
> > Reported-by: Geert Uytterhoeven <geert@linux-m68k.org>
> > Cc: Masahiro Yamada <yamada.masahiro@socionext.com>
> > Cc: Nicholas Piggin <npiggin@gmail.com>
> > Cc: stable@vger.kernel.org # v4.19+
> > ---
> >  init/Kconfig | 1 +
> >  1 file changed, 1 insertion(+)
> >
> > diff --git a/init/Kconfig b/init/Kconfig
> > index d47cb77a220e..c787f782148d 100644
> > --- a/init/Kconfig
> > +++ b/init/Kconfig
> > @@ -1124,6 +1124,7 @@ config LD_DEAD_CODE_DATA_ELIMINATION
> >         bool "Dead code and data elimination (EXPERIMENTAL)"
> >         depends on HAVE_LD_DEAD_CODE_DATA_ELIMINATION
> >         depends on EXPERT
> > +       depends on !FUNCTION_TRACER || !CC_IS_GCC || GCC_VERSION >= 40800
> >         depends on $(cc-option,-ffunction-sections -fdata-sections)
> >         depends on $(ld-option,--gc-sections)
> >         help
> 
> Thanks for the fix.
> 
> I prefer this explicit 'depends on'.
> 
> Relying on the order of $(call cc-option, ...) in Makefile is fragile.
> 
> We raise the compiler minimum version from time to time.
> So, this 'depends on' will eventually go away in the future.
> 
> BTW, which one do you think more readable?
> 
> depends on !FUNCTION_TRACER || !CC_IS_GCC || GCC_VERSION >= 40800
> 
>     OR
> 
> depends on !(FUNCTION_TRACER && CC_IS_GCC && GCC_VERSION < 40800)

Thanks - yes I agree it's nice that this is more explicit than the
ordering we previously relied upon.

I personally don't mind either of the 2 options above - let me know if
you'd like me to submit a v2 using your second option.

Thanks,
    Paul

Re: [PATCH] kbuild: Disable LD_DEAD_CODE_DATA_ELIMINATION with ftrace & GCC <= 4.7

[Masahiro Yamada]

On Fri, Jan 11, 2019 at 3:11 AM Paul Burton <paul.burton@mips.com> wrote:
>
> Hi Masahiro,
>
> On Thu, Jan 10, 2019 at 11:00:49AM +0900, Masahiro Yamada wrote:
> > On Thu, Jan 10, 2019 at 8:16 AM Paul Burton <paul.burton@mips.com> wrote:
> > > When building using GCC 4.7 or older, -ffunction-sections & the -pg flag
> > > used by ftrace are incompatible. This causes warnings or build failures
> > > (where -Werror applies) such as the following:
> > >
> > >   arch/mips/generic/init.c:
> > >     error: -ffunction-sections disabled; it makes profiling impossible
> > >
> > > This used to be taken into account by the ordering of calls to cc-option
> > > from within the top-level Makefile, which was introduced by commit
> > > 90ad4052e85c ("kbuild: avoid conflict between -ffunction-sections and
> > > -pg on gcc-4.7"). Unfortunately this was broken when the
> > > CONFIG_LD_DEAD_CODE_DATA_ELIMINATION cc-option check was moved to
> > > Kconfig in commit e85d1d65cd8a ("kbuild: test dead code/data elimination
> > > support in Kconfig"), because the flags used by this check no longer
> > > include -pg.
> > >
> > > Fix this by not allowing CONFIG_LD_DEAD_CODE_DATA_ELIMINATION to be
> > > enabled at the same time as ftrace/CONFIG_FUNCTION_TRACER when building
> > > using GCC 4.7 or older.
> > >
> > > Signed-off-by: Paul Burton <paul.burton@mips.com>
> > > Fixes: e85d1d65cd8a ("kbuild: test dead code/data elimination support in Kconfig")
> > > Reported-by: Geert Uytterhoeven <geert@linux-m68k.org>
> > > Cc: Masahiro Yamada <yamada.masahiro@socionext.com>
> > > Cc: Nicholas Piggin <npiggin@gmail.com>
> > > Cc: stable@vger.kernel.org # v4.19+
> > > ---
> > >  init/Kconfig | 1 +
> > >  1 file changed, 1 insertion(+)
> > >
> > > diff --git a/init/Kconfig b/init/Kconfig
> > > index d47cb77a220e..c787f782148d 100644
> > > --- a/init/Kconfig
> > > +++ b/init/Kconfig
> > > @@ -1124,6 +1124,7 @@ config LD_DEAD_CODE_DATA_ELIMINATION
> > >         bool "Dead code and data elimination (EXPERIMENTAL)"
> > >         depends on HAVE_LD_DEAD_CODE_DATA_ELIMINATION
> > >         depends on EXPERT
> > > +       depends on !FUNCTION_TRACER || !CC_IS_GCC || GCC_VERSION >= 40800
> > >         depends on $(cc-option,-ffunction-sections -fdata-sections)
> > >         depends on $(ld-option,--gc-sections)
> > >         help
> >
> > Thanks for the fix.
> >
> > I prefer this explicit 'depends on'.
> >
> > Relying on the order of $(call cc-option, ...) in Makefile is fragile.
> >
> > We raise the compiler minimum version from time to time.
> > So, this 'depends on' will eventually go away in the future.
> >
> > BTW, which one do you think more readable?
> >
> > depends on !FUNCTION_TRACER || !CC_IS_GCC || GCC_VERSION >= 40800
> >
> >     OR
> >
> > depends on !(FUNCTION_TRACER && CC_IS_GCC && GCC_VERSION < 40800)
>
> Thanks - yes I agree it's nice that this is more explicit than the
> ordering we previously relied upon.
>
> I personally don't mind either of the 2 options above - let me know if
> you'd like me to submit a v2 using your second option.
>
> Thanks,
>     Paul



Personally, I slightly prefer this:
   depends on !(FUNCTION_TRACER && CC_IS_GCC && GCC_VERSION < 40800)


It is more consistent with your patch title:
   "Disable LD_DEAD_CODE_DATA_ELIMINATION with ftrace & GCC <= 4.7"


May I ask v2?



-- 
Best Regards
Masahiro Yamada

[PATCH v2] kbuild: Disable LD_DEAD_CODE_DATA_ELIMINATION with ftrace & GCC <= 4.7

[Paul Burton]

When building using GCC 4.7 or older, -ffunction-sections & the -pg flag
used by ftrace are incompatible. This causes warnings or build failures
(where -Werror applies) such as the following:

  arch/mips/generic/init.c:
    error: -ffunction-sections disabled; it makes profiling impossible

This used to be taken into account by the ordering of calls to cc-option
from within the top-level Makefile, which was introduced by commit
90ad4052e85c ("kbuild: avoid conflict between -ffunction-sections and
-pg on gcc-4.7"). Unfortunately this was broken when the
CONFIG_LD_DEAD_CODE_DATA_ELIMINATION cc-option check was moved to
Kconfig in commit e85d1d65cd8a ("kbuild: test dead code/data elimination
support in Kconfig"), because the flags used by this check no longer
include -pg.

Fix this by not allowing CONFIG_LD_DEAD_CODE_DATA_ELIMINATION to be
enabled at the same time as ftrace/CONFIG_FUNCTION_TRACER when building
using GCC 4.7 or older.

Signed-off-by: Paul Burton <paul.burton@mips.com>
Fixes: e85d1d65cd8a ("kbuild: test dead code/data elimination support in Kconfig")
Reported-by: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Masahiro Yamada <yamada.masahiro@socionext.com>
Cc: Nicholas Piggin <npiggin@gmail.com>
Cc: stable@vger.kernel.org # v4.19+
Cc: linux-kbuild@vger.kernel.org
Cc: linux-mips@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
---
Changes in v2:
- Invert the dependency as Masahiro suggested.
---
 init/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/init/Kconfig b/init/Kconfig
index d47cb77a220e..513fa544a134 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -1124,6 +1124,7 @@ config LD_DEAD_CODE_DATA_ELIMINATION
 	bool "Dead code and data elimination (EXPERIMENTAL)"
 	depends on HAVE_LD_DEAD_CODE_DATA_ELIMINATION
 	depends on EXPERT
+	depends on !(FUNCTION_TRACER && CC_IS_GCC && GCC_VERSION < 40800)
 	depends on $(cc-option,-ffunction-sections -fdata-sections)
 	depends on $(ld-option,--gc-sections)
 	help
-- 
2.20.1

Re: [PATCH v2] kbuild: Disable LD_DEAD_CODE_DATA_ELIMINATION with ftrace & GCC <= 4.7

[Masahiro Yamada]

On Sat, Jan 12, 2019 at 6:00 AM Paul Burton <paul.burton@mips.com> wrote:
>
> When building using GCC 4.7 or older, -ffunction-sections & the -pg flag
> used by ftrace are incompatible. This causes warnings or build failures
> (where -Werror applies) such as the following:
>
>   arch/mips/generic/init.c:
>     error: -ffunction-sections disabled; it makes profiling impossible
>
> This used to be taken into account by the ordering of calls to cc-option
> from within the top-level Makefile, which was introduced by commit
> 90ad4052e85c ("kbuild: avoid conflict between -ffunction-sections and
> -pg on gcc-4.7"). Unfortunately this was broken when the
> CONFIG_LD_DEAD_CODE_DATA_ELIMINATION cc-option check was moved to
> Kconfig in commit e85d1d65cd8a ("kbuild: test dead code/data elimination
> support in Kconfig"), because the flags used by this check no longer
> include -pg.
>
> Fix this by not allowing CONFIG_LD_DEAD_CODE_DATA_ELIMINATION to be
> enabled at the same time as ftrace/CONFIG_FUNCTION_TRACER when building
> using GCC 4.7 or older.
>
> Signed-off-by: Paul Burton <paul.burton@mips.com>
> Fixes: e85d1d65cd8a ("kbuild: test dead code/data elimination support in Kconfig")
> Reported-by: Geert Uytterhoeven <geert@linux-m68k.org>
> Cc: Masahiro Yamada <yamada.masahiro@socionext.com>
> Cc: Nicholas Piggin <npiggin@gmail.com>
> Cc: stable@vger.kernel.org # v4.19+
> Cc: linux-kbuild@vger.kernel.org
> Cc: linux-mips@vger.kernel.org
> Cc: linux-kernel@vger.kernel.org
> ---
> Changes in v2:
> - Invert the dependency as Masahiro suggested.


Applied to linux-kbuild/fixes.


Thanks!


-- 
Best Regards
Masahiro Yamada

Re: Build regressions/improvements in v5.0-rc1

[Michael Ellerman]

Geert Uytterhoeven <geert@linux-m68k.org> writes:
> Below is the list of build error/warning regressions/improvements in
> v5.0-rc1[1] compared to v4.20[2].
>
> Summarized:
>   - build errors: +12/-4
>   - build warnings: +405/-350
>
> Happy fixing! ;-)
>
> Thanks to the linux-next team for providing the build service.
>
> [1] http://kisskb.ellerman.id.au/kisskb/branch/linus/head/bfeffd155283772bbe78c6a05dec7c0128ee500c/ (all 240 configs)
> [2] http://kisskb.ellerman.id.au/kisskb/branch/linus/head/8fe28cb58bcb235034b64cbbb7550a8a43fd88be/ (all 240 configs)

FYI you can get a high-level comparison of the failures between the two
revisions here:

  http://kisskb.ellerman.id.au/kisskb/branch/linus/head/bfeffd155283772bbe78c6a05dec7c0128ee500c/compare/8fe28cb58bcb235034b64cbbb7550a8a43fd88be/

cheers