GCC4.6.1编译Linux内核kernel3.0出现的警告信息（原创）
作者：余超 Email：yuchao86@gmail.com
[yuchao@yuchao-Latitude-E5410 linux-3.0]$gcc –version
gcc (GCC) 4.6.1Copyright ? 2011 Free Software Foundation, Inc.本程序是自由软件；请参看源代码的版权声明。本软件没有任何担保；包括没有适销性和某一专用目的下的适用性担保。========================================================================================drivers/ata/sata_sil.c: 在函数‘sil_host_intr’中:drivers/ata/sata_sil.c:453:14: 警告：此函数中的‘serror’在使用前可能未初始化 [-Wuninitialized]=========================================================================================drivers/block/drbd/drbd_main.c: 在函数‘drbd_buildtag’中:drivers/block/drbd/drbd_main.c:4187:19: 警告：the comparison will always evaluate as ‘true’ for the address of ‘__this_module’ will never be NULL [-Waddress] CC [M] drivers/block/drbd/drbd_strings.o========================================================================================= CC [M] drivers/block/DAC960.odrivers/block/DAC960.c: 在函数‘DAC960_V2_ProcessCompletedCommand’中:drivers/block/DAC960.c:5095:30: 警告：在‘DAC960_V2_IOCTL_Opcode_T’和‘enum <匿名>’间比较 [-Wenum-compare]drivers/block/DAC960.c: 在函数‘DAC960_V1_EnableMemoryMailboxInterface’中:/home/yuchao/dev/linux-3.0/arch/x86/include/asm/io.h:63:1: 警告：此函数中的‘CommandMailbox.Bytes[12]’在使用前可能未初始化 [-Wuninitialized]drivers/block/DAC960.c:1175:30: 附注：‘CommandMailbox.Bytes[12]’在此声明=====================================================================================================================================在函数‘copy_from_user’中, 内联自‘parse_command.part.1’于 fs/binfmt_misc.c:422:20:/home/yuchao/dev/linux-3.0/arch/x86/include/asm/uaccess_32.h:211:26: 警告：调用‘copy_from_user_overflow’，声明有警告属性：copy_from_user() buffer size is not provably correct [默认启用]arch/x86/kvm/emulate.c: 在函数‘emulate_sysexit’中:arch/x86/kvm/emulate.c:2054:9: 警告：此函数中的‘ss_sel’在使用前可能未初始化 [-Wuninitialized]arch/x86/kvm/emulate.c:2053:9: 警告：此函数中的‘cs_sel’在使用前可能未初始化 [-Wuninitialized]/home/yuchao/dev/linux-3.0/arch/x86/include/asm/bitops.h: 在函数‘can_boost.part.7’中:/home/yuchao/dev/linux-3.0/arch/x86/include/asm/bitops.h:319:2: 警告：不建议在 asm 操作数 1 中不带左值地使用内存输入 [默认启用]WARNING: drivers/eisa/built-in.o(.data+0xd0): Section mismatch in reference from the variable pci_eisa_driver to the function .init.text:pci_eisa_init()The variable pci_eisa_driver referencesthe function __init pci_eisa_init()If the reference is valid then annotate thevariable with __init* or __refdata (see linux/init.h) or name the variable:*_template, *_timer, *_sht, *_ops, *_probe, *_probe_one, *_consoleWARNING: drivers/gpu/drm/radeon/radeon.o(.text+0x4435b): Section mismatch in reference from the function radeon_get_clock_info() to the function .devinit.text:radeon_read_clocks_OF()The function radeon_get_clock_info() referencesthe function __devinit radeon_read_clocks_OF().This is often because radeon_get_clock_info lacks a __devinitannotation or the annotation of radeon_read_clocks_OF is wrong. CC [M] drivers/gpu/drm/nouveau/nv50_display.odrivers/gpu/drm/nouveau/nv50_display.c: 在函数‘nv50_display_unk10_handler’中:drivers/gpu/drm/nouveau/nv50_display.c:628:15: 警告：此函数中的‘or’在使用前可能未初始化 [-Wuninitialized]drivers/gpu/drm/nouveau/nv50_display.c: 在函数‘nv50_display_unk20_handler’中:drivers/gpu/drm/nouveau/nv50_display.c:751:15: 警告：此函数中的‘or’在使用前可能未初始化 [-Wuninitialized] CC [M] drivers/gpu/drm/nouveau/nv04_dac.odrivers/hwmon/applesmc.c: 在函数‘applesmc_get_entry_by_key’中:drivers/hwmon/applesmc.c:390:10: 警告：此函数中的‘end’在使用前可能未初始化 [-Wuninitialized] CC [M] drivers/hwmon/asc7621.odrivers/infiniband/hw/mlx4/qp.c: 在函数‘build_mlx_header’中:drivers/infiniband/hw/mlx4/qp.c:1379:30: 警告：此函数中的‘vlan’在使用前可能未初始化 [-Wuninitialized]In file included from /home/yuchao/dev/linux-3.0/arch/x86/include/asm/uaccess.h:570:0, from include/net/checksum.h:25, from include/linux/skbuff.h:28, from drivers/isdn/hardware/avm/b1.c:17:在函数‘copy_from_user’中, 内联自‘b1_load_t4file’于 drivers/isdn/hardware/avm/b1.c:179:22:/home/yuchao/dev/linux-3.0/arch/x86/include/asm/uaccess_32.h:211:26: 警告：调用‘copy_from_user_overflow’，声明有警告属性：copy_from_user() buffer size is not provably correct [默认启用]在函数‘copy_from_user’中, 内联自‘b1_load_config’于 drivers/isdn/hardware/avm/b1.c:227:22:/home/yuchao/dev/linux-3.0/arch/x86/include/asm/uaccess_32.h:211:26: 警告：调用‘copy_from_user_overflow’，声明有警告属性：copy_from_user() buffer size is not provably correct [默认启用] CC [M] drivers/isdn/hardware/avm drivers/isdn/hardware/eicon/message.c: 在函数‘mixer_notify_update’中:drivers/isdn/hardware/eicon/message.c:11308:54: 警告：数组下标大于数组边界 [-Warray-bounds]drivers/isdn/hardware/mISDN/hfcpci.c: 在函数‘hfcpci_softirq’中:drivers/isdn/hardware/mISDN/hfcpci.c:2318:2: 警告：忽略声明有 warn_unused_result 属性的‘driver_for_each_device’的返回值 [-Wunused-result]=============================================================================== CC [M] drivers/media/dvb/dvb-core/dvb_ca_en50221.oIn file included from /home/yuchao/dev/linux-3.0/arch/x86/include/asm/uaccess.h:570:0, from include/linux/poll.h:14, from drivers/media/dvb/dvb-core/dvbdev.h:27, from drivers/media/dvb/dvb-core/dvb_ca_en50221.h:27, from drivers/media/dvb/dvb-core/dvb_ca_en50221.c:41:在函数‘copy_from_user’中, 内联自‘dvb_ca_en50221_io_write’于 drivers/media/dvb/dvb-core/dvb_ca_en50221.c:1314:26:/home/yuchao/dev/linux-3.0/arch/x86/include/asm/uaccess_32.h:211:26: 警告：调用‘copy_from_user_overflow’，声明有警告属性：copy_from_user() buffer size is not provably correct [默认启用]==================================================================drivers/media/common/tuners/max2165.c: 在函数‘max2165_set_rf’中:drivers/media/common/tuners/max2165.c:203:11: 警告：此函数中的‘fraction’在使用前可能未初始化 [-Wuninitialized]drivers/media/common/tuners/max2165.c:205:19: 警告：此函数中的‘quotient’在使用前可能未初始化 [-Wuninitialized]=========================================================================================================================================================================================================================drivers/isdn/sc/init.c: 在函数‘identify_board’中:drivers/isdn/sc/init.c:487:2: 警告：传递‘readl’的第 1 个参数时将整数赋给指针，未作类型转换 [默认启用]/home/yuchao/dev/linux-3.0/arch/x86/include/asm/io.h:57:1: 附注：需要类型‘const volatile void *’，但实参的类型为‘long unsigned int’drivers/isdn/sc/init.c:497:2: 警告：传递‘readl’的第 1 个参数时将整数赋给指针，未作类型转换 [默认启用]/home/yuchao/dev/linux-3.0/arch/x86/include/asm/io.h:57:1: 附注：需要类型‘const volatile void *’，但实参的类型为‘long unsigned int’drivers/isdn/sc/init.c:507:2: 警告：传递‘readl’的第 1 个参数时将整数赋给指针，未作类型转换 [默认启用]/home/yuchao/dev/linux-3.0/arch/x86/include/asm/io.h:57:1: 附注：需要类型‘const volatile void *’，但实参的类型为‘long unsigned int’=============================================================================================================================drivers/isdn/icn/icn.c: 在函数‘icn_sendbuf’中:drivers/isdn/icn/icn.c:721:4: 警告：#warning TODO test headroom or use skb->nb to flag ACK [-Wcpp]In file included from /home/yuchao/dev/linux-3.0/arch/x86/include/asm/uaccess.h:570:0, from include/net/checksum.h:25, from include/linux/skbuff.h:28, from include/linux/isdnif.h:57, from drivers/isdn/icn/icn.h:51, from drivers/isdn/icn/icn.c:12:在函数‘copy_from_user’中, 内联自‘icn_writecmd’于 drivers/isdn/icn/icn.c:1048:22:/home/yuchao/dev/linux-3.0/arch/x86/include/asm/uaccess_32.h:211:26: 警告：调用‘copy_from_user_overflow’，声明有警告属性：copy_from_user() buffer size is not provably correct [默认启用]===============================================================================================================================drivers/isdn/hardware/mISDN/hfcpci.c: 在函数‘hfcpci_softirq’中:drivers/isdn/hardware/mISDN/hfcpci.c:2318:2: 警告：忽略声明有 warn_unused_result 属性的‘driver_for_each_device’的返回值 [-Wunused-result]==============================================================================================================drivers/isdn/hardware/eicon/message.c: 在函数‘mixer_notify_update’中:drivers/isdn/hardware/eicon/message.c:11308:54: 警告：数组下标大于数组边界 [-Warray-bounds]In file included from /home/yuchao/dev/linux-3.0/arch/x86/include/asm/uaccess.h:570:0, from include/net/checksum.h:25, from include/linux/skbuff.h:28, from drivers/isdn/hardware/avm/b1.c:17:在函数‘copy_from_user’中, 内联自‘b1_load_t4file’于 drivers/isdn/hardware/avm/b1.c:179:22:/home/yuchao/dev/linux-3.0/arch/x86/include/asm/uaccess_32.h:211:26: 警告：调用‘copy_from_user_overflow’，声明有警告属性：copy_from_user() buffer size is not provably correct [默认启用]在函数‘copy_from_user’中, 内联自‘b1_load_config’于 drivers/isdn/hardware/avm/b1.c:227:22:/home/yuchao/dev/linux-3.0/arch/x86/include/asm/uaccess_32.h:211:26: 警告：调用‘copy_from_user_overflow’，声明有警告属性：copy_from_user() buffer size is not provably correct [默认启用]===========================================================================================WARNING: drivers/mfd/built-in.o(.data+0x24cc): Section mismatch in reference from the variable ab3550_driver to the function .init.text:ab3550_probe()The variable ab3550_driver referencesthe function __init ab3550_probe()If the reference is valid then annotate thevariable with __init* or __refdata (see linux/init.h) or name the variable:*_template, *_timer, *_sht, *_ops, *_probe, *_probe_one, *_console++++++++++++++++++++++++++++++++WARNING: drivers/net/phy/built-in.o(.init.text+0x4c2): Section mismatch in reference from the function mdio_gpio_init() to the function .exit.text:mdio_ofgpio_exit()The function __init mdio_gpio_init() referencesa function __exit mdio_ofgpio_exit().This is often seen when error handling in the init functionuses functionality in the exit path.The fix is often to remove the __exit annotation ofmdio_ofgpio_exit() so it may be used outside an exit section.=================================================================drivers/misc/lkdtm.c: 在函数‘recursive_loop.constprop.2’中:drivers/misc/lkdtm.c:276:1: 警告：栈帧有 1028 字节，超过了 1024 字节 [-Wframe-larger-than=]==================================================================In file included from drivers/net/tokenring/smctr.c:43:0:include/linux/mca-legacy.h:12:2: 警告：#warning "MCA legacy – please move your driver to the new sysfs api" [-Wcpp]include/linux/mtd/map.h:330:11: 警告：此函数中的‘r.x[0]’在使用前可能未初始化 [-Wuninitialized]=======================================================================drivers/net/pcmcia/nmclan_cs.c: 在函数‘nmclan_config’中:drivers/net/pcmcia/nmclan_cs.c:628:3: 警告：不建议使用‘pcmcia_request_exclusive_irq’(声明于 include/pcmcia/ds.h:201) [-Wdeprecated-declarations]drivers/net/pcmcia/ibmtr_cs.c: 在函数‘ibmtr_config’中:drivers/net/pcmcia/ibmtr_cs.c:195:5: 警告：不建议使用‘pcmcia_request_exclusive_irq’(声明于 include/pcmcia/ds.h:201) [-Wdeprecated-declarations]========================================================drivers/net/wan/cycx_x25.c: 在函数‘hex_dump’中:drivers/net/wan/cycx_x25.c:1030:1: 警告：栈帧有 1040 字节，超过了 1024 字节 [-Wframe-larger-than=]drivers/net/wireless/prism54/isl_ioctl.c: 在函数‘prism54_hostapd’中:drivers/net/wireless/prism54/isl_ioctl.c:2733:14: 警告：数组下标大于数组边界 [-Warray-bounds]drivers/net/wireless/airo.c: 在函数‘encapsulate’中:drivers/net/wireless/airo.c:1421:15: 警告：数组下标大于数组边界 [-Warray-bounds]drivers/net/wireless/ray_cs.c: 在函数‘rx_authenticate.isra.13’中:drivers/net/wireless/ray_cs.c:2439:15: 警告：数组下标大于数组边界 [-Warray-bounds]drivers/net/cnic.c: 在函数‘cnic_cm_open’中:drivers/net/cnic.c:4047:2: 警告：the comparison will always evaluate as ‘true’ for the address of ‘cm_ulp_ops’ will never be NULL [-Waddress]drivers/net/cnic.c: 在函数‘cnic_start_bnx2_hw’中:drivers/net/cnic.c:4556:1: 警告：栈帧有 1168 字节，超过了 1024 字节 [-Wframe-larger-than=]drivers/scsi/aic94xx/aic94xx_sds.c:597:21: 警告：此函数中的‘offs’在使用前可能未初始化 [-Wuninitialized]drivers/scsi/libsas/sas_ata.c:80:3: 警告：case 值‘2’不在枚举类型‘enum exec_status’内 [-Wswitch]drivers/scsi/lpfc/lpfc_bsg.c:1662:5: 警告：此函数中的‘mbxstatus’在使用前可能未初始化 [-Wuninitialized]drivers/staging/comedi/drivers/pcmmio.c:498:22: 警告：数组下标大于数组边界 [-Warray-bounds]drivers/staging/comedi/drivers/pcmmio.c:561:37: 警告：此函数中的‘irq[1]’在使用前可能未初始化 [-Wuninitialized]drivers/staging/comedi/drivers/vmk80xx.c: 在函数‘vmk80xx_cnt_rinsn’中:drivers/staging/comedi/drivers/vmk80xx.c:995:37: 警告：此函数中的‘reg[0]’在使用前可能未初始化 [-Wuninitialized]drivers/staging/iio/industrialio-core.c: 在函数‘iio_device_add_event_sysfs.isra.3’中:drivers/staging/iio/industrialio-core.c:925:7: 警告：此函数中的‘mask’在使用前可能未初始化 [-Wuninitialized]drivers/telephony/ixj.c: 在函数‘add_caps’中:drivers/telephony/ixj.c:5930:38: 警告：‘j->caps’上的运算结果可能是未定义的 [-Wsequence-point]而只有在充满了艰辛的人生旅途中，
