Missing #include <config.h>

[Jörn Engel <joern@infradead.org>]

After spending some hours last night and this morning hunting a bug,
I've found that a different include order made a difference.  Some
files don't work correctly, unless config.h is included before.

Here is a very stupid bug checker for the problem class:
$ rgrep CONFIG include/ | cut -d: -f1 | sort -u > g1
$ rgrep CONFIG include/ | cut -d: -f1 | sort -u | xargs grep "config.h" | cut -d: -f1 | sort -u > g2
$ diff -u g1 g2 | grep ^- > g3

Result is quite a long list for 2.6.13.  include/config/* are false
positives, ok.  But what should we do about the rest?

-include/acpi/acpi_bus.h
-include/acpi/acpi_drivers.h
-include/acpi/actypes.h
-include/acpi/amlcode.h
-include/asm-alpha/bug.h
-include/asm-alpha/core_polaris.h
-include/asm-alpha/ioctls.h
-include/asm-alpha/pci.h
-include/asm-alpha/processor.h
-include/asm-alpha/rwsem.h
-include/asm-alpha/semaphore.h
-include/asm-alpha/topology.h
-include/asm-arm/arch-clps711x/debug-macro.S
-include/asm-arm/arch-clps711x/time.h
-include/asm-arm/arch-ebsa285/debug-macro.S
-include/asm-arm/arch-epxa10db/excalibur.h
-include/asm-arm/arch-epxa10db/hardware.h
-include/asm-arm/arch-epxa10db/pld_conf00.h
-include/asm-arm/arch-h720x/boards.h
-include/asm-arm/arch-h720x/dma.h
-include/asm-arm/arch-h720x/entry-macro.S
-include/asm-arm/arch-h720x/hardware.h
-include/asm-arm/arch-h720x/irqs.h
-include/asm-arm/arch-imx/hardware.h
-include/asm-arm/arch-integrator/hardware.h
-include/asm-arm/arch-integrator/platform.h
-include/asm-arm/arch-iop3xx/debug-macro.S
-include/asm-arm/arch-iop3xx/entry-macro.S
-include/asm-arm/arch-iop3xx/iop321.h
-include/asm-arm/arch-iop3xx/iop331-irqs.h
-include/asm-arm/arch-iop3xx/iop331.h
-include/asm-arm/arch-iop3xx/irqs.h
-include/asm-arm/arch-iop3xx/system.h
-include/asm-arm/arch-ixp2000/io.h
-include/asm-arm/arch-ixp2000/platform.h
-include/asm-arm/arch-ixp4xx/entry-macro.S
-include/asm-arm/arch-ixp4xx/hardware.h
-include/asm-arm/arch-ixp4xx/io.h
-include/asm-arm/arch-ixp4xx/irqs.h
-include/asm-arm/arch-ixp4xx/ixp4xx-regs.h
-include/asm-arm/arch-l7200/time.h
-include/asm-arm/arch-lh7a40x/entry-macro.S
-include/asm-arm/arch-lh7a40x/memory.h
-include/asm-arm/arch-omap/board-innovator.h
-include/asm-arm/arch-omap/cpu.h
-include/asm-arm/arch-omap/debug-macro.S
-include/asm-arm/arch-omap/fpga.h
-include/asm-arm/arch-omap/memory.h
-include/asm-arm/arch-omap/mux.h
-include/asm-arm/arch-omap/omap16xx.h
-include/asm-arm/arch-omap/omap730.h
-include/asm-arm/arch-omap/param.h
-include/asm-arm/arch-omap/pm.h
-include/asm-arm/arch-omap/tc.h
-include/asm-arm/arch-omap/tps65010.h
-include/asm-arm/arch-pxa/dma.h
-include/asm-arm/arch-pxa/entry-macro.S
-include/asm-arm/arch-pxa/memory.h
-include/asm-arm/arch-s3c2410/debug-macro.S
-include/asm-arm/arch-s3c2410/hardware.h
-include/asm-arm/arch-s3c2410/memory.h
-include/asm-arm/arch-s3c2410/regs-clock.h
-include/asm-arm/arch-s3c2410/regs-dsc.h
-include/asm-arm/arch-versatile/platform.h
-include/asm-arm/arch-versatile/system.h
-include/asm-arm/bitops.h
-include/asm-arm/hardware/pci_v3.h
-include/asm-arm/ide.h
-include/asm-arm/ioctls.h
-include/asm-arm/mach/irq.h
-include/asm-arm/mach/time.h
-include/asm-arm/numnodes.h
-include/asm-arm/setup.h
-include/asm-arm/spinlock.h
-include/asm-arm26/ioctls.h
-include/asm-cris/arch-v10/pgtable.h
-include/asm-cris/arch-v10/processor.h
-include/asm-cris/arch-v10/sv_addr.agh
-include/asm-cris/arch-v10/sv_addr_ag.h
-include/asm-cris/arch-v32/atomic.h
-include/asm-cris/arch-v32/hwregs/asm/intr_vect.h
-include/asm-cris/arch-v32/hwregs/intr_vect.h
-include/asm-cris/arch-v32/juliette.h
-include/asm-cris/arch-v32/spinlock.h
-include/asm-cris/dma-mapping.h
-include/asm-cris/dma.h
-include/asm-cris/io.h
-include/asm-cris/ioctls.h
-include/asm-cris/system.h
-include/asm-frv/cacheflush.h
-include/asm-frv/cpu-irqs.h
-include/asm-frv/ioctls.h
-include/asm-frv/mb-regs.h
-include/asm-frv/mb86943a.h
-include/asm-frv/mem-layout.h
-include/asm-frv/mmu.h
-include/asm-frv/setup.h
-include/asm-frv/thread_info.h
-include/asm-frv/topology.h
-include/asm-frv/uaccess.h
-include/asm-generic/percpu.h
-include/asm-generic/rtc.h
-include/asm-h8300/ioctls.h
-include/asm-h8300/irq.h
-include/asm-h8300/ptrace.h
-include/asm-h8300/timex.h
-include/asm-i386/acpi.h
-include/asm-i386/cacheflush.h
-include/asm-i386/cpu.h
-include/asm-i386/ioctls.h
-include/asm-i386/kprobes.h
-include/asm-i386/linkage.h
-include/asm-i386/mach-default/do_timer.h
-include/asm-i386/mach-default/entry_arch.h
-include/asm-i386/mach-default/irq_vectors_limits.h
-include/asm-i386/mach-default/mach_apic.h
-include/asm-i386/mach-default/pci-functions.h
-include/asm-i386/mach-es7000/mach_apic.h
-include/asm-i386/mach-es7000/mach_wakecpu.h
-include/asm-i386/mach-summit/mach_mpparse.h
-include/asm-i386/mach-visws/cobalt.h
-include/asm-i386/mach-visws/do_timer.h
-include/asm-i386/mach-visws/entry_arch.h
-include/asm-i386/mach-visws/mach_apic.h
-include/asm-i386/mach-voyager/do_timer.h
-include/asm-i386/mach-voyager/setup_arch_post.h
-include/asm-i386/mmzone.h
-include/asm-i386/module.h
-include/asm-i386/mpspec.h
-include/asm-i386/msi.h
-include/asm-i386/numaq.h
-include/asm-i386/ptrace.h
-include/asm-i386/sparsemem.h
-include/asm-i386/srat.h
-include/asm-i386/suspend.h
-include/asm-i386/timer.h
-include/asm-i386/topology.h
-include/asm-i386/voyager.h
-include/asm-ia64/acpi.h
-include/asm-ia64/bug.h
-include/asm-ia64/cpu.h
-include/asm-ia64/cyclone.h
-include/asm-ia64/hw_irq.h
-include/asm-ia64/ioctls.h
-include/asm-ia64/iosapic.h
-include/asm-ia64/irq.h
-include/asm-ia64/kprobes.h
-include/asm-ia64/mmu_context.h
-include/asm-ia64/mmzone.h
-include/asm-ia64/numnodes.h
-include/asm-ia64/pci.h
-include/asm-ia64/sal.h
-include/asm-ia64/sn/shub_mmr.h
-include/asm-ia64/sn/sn2/sn_hwperf.h
-include/asm-ia64/sn/tioca.h
-include/asm-ia64/spinlock.h
-include/asm-ia64/topology.h
-include/asm-m32r/ioctls.h
-include/asm-m32r/m32102.h
-include/asm-m32r/mmzone.h
-include/asm-m32r/s1d13806.h
-include/asm-m32r/thread_info.h
-include/asm-m68k/amigayle.h
-include/asm-m68k/amipcmcia.h
-include/asm-m68k/bvme6000hw.h
-include/asm-m68k/ioctls.h
-include/asm-m68k/mvme16xhw.h
-include/asm-m68knommu/anchor.h
-include/asm-m68knommu/atomic.h
-include/asm-m68knommu/cacheflush.h
-include/asm-m68knommu/checksum.h
-include/asm-m68knommu/dbg.h
-include/asm-m68knommu/delay.h
-include/asm-m68knommu/m5249sim.h
-include/asm-m68knommu/m5307sim.h
-include/asm-m68knommu/pci.h
-include/asm-m68knommu/ptrace.h
-include/asm-m68knommu/string.h
-include/asm-m68knommu/thread_info.h
-include/asm-m68knommu/ucontext.h
-include/asm-mips/arc/hinv.h
-include/asm-mips/bug.h
-include/asm-mips/ddb5xxx/ddb5074.h
-include/asm-mips/ddb5xxx/ddb5476.h
-include/asm-mips/galileo-boards/gt96100.h
-include/asm-mips/gt64120.h
-include/asm-mips/gt64240.h
-include/asm-mips/ioctls.h
-include/asm-mips/ip32/mace.h
-include/asm-mips/jazz.h
-include/asm-mips/lasat/lasat.h
-include/asm-mips/mach-au1x00/au1000_usbdev.h
-include/asm-mips/mach-au1x00/au1100_mmc.h
-include/asm-mips/mach-au1x00/au1xxx_psc.h
-include/asm-mips/mach-pb1x00/pb1000.h
-include/asm-mips/mips-boards/bonito64.h
-include/asm-mips/mips-boards/malta.h
-include/asm-mips/mmzone.h
-include/asm-mips/pci/bridge.h
-include/asm-mips/sgi/mc.h
-include/asm-mips/sibyte/sb1250_dma.h
-include/asm-mips/sibyte/sb1250_mc.h
-include/asm-mips/sibyte/sb1250_regs.h
-include/asm-mips/sibyte/sb1250_scd.h
-include/asm-mips/sni.h
-include/asm-mips/titan_dep.h
-include/asm-mips/tx4927/smsc_fdc37m81x.h
-include/asm-mips/tx4927/tx4927.h
-include/asm-parisc/assembly.h
-include/asm-parisc/bug.h
-include/asm-parisc/ioctls.h
-include/asm-parisc/led.h
-include/asm-parisc/mmzone.h
-include/asm-parisc/pdcpat.h
-include/asm-parisc/rt_sigframe.h
-include/asm-parisc/spinlock.h
-include/asm-parisc/superio.h
-include/asm-ppc/atomic.h
-include/asm-ppc/bug.h
-include/asm-ppc/cpm2.h
-include/asm-ppc/gg2.h
-include/asm-ppc/gt64260_defs.h
-include/asm-ppc/hawk_defs.h
-include/asm-ppc/highmem.h
-include/asm-ppc/ibm_ocp.h
-include/asm-ppc/ioctls.h
-include/asm-ppc/kexec.h
-include/asm-ppc/macio.h
-include/asm-ppc/mpc52xx.h
-include/asm-ppc/mpc8260_pci9.h
-include/asm-ppc/mv64x60_defs.h
-include/asm-ppc/pci.h
-include/asm-ppc/perfmon.h
-include/asm-ppc/pnp.h
-include/asm-ppc/ppc_sys.h
-include/asm-ppc/ppcboot.h
-include/asm-ppc/ptrace.h
-include/asm-ppc/reg.h
-include/asm-ppc/reg_booke.h
-include/asm-ppc/residual.h
-include/asm-ppc/spinlock.h
-include/asm-ppc/termios.h
-include/asm-ppc/uninorth.h
-include/asm-ppc64/bug.h
-include/asm-ppc64/iSeries/HvLpConfig.h
-include/asm-ppc64/ioctls.h
-include/asm-ppc64/iommu.h
-include/asm-ppc64/kprobes.h
-include/asm-ppc64/pSeries_reconfig.h
-include/asm-ppc64/pci.h
-include/asm-ppc64/ptrace.h
-include/asm-ppc64/rtas.h
-include/asm-ppc64/sparsemem.h
-include/asm-ppc64/termios.h
-include/asm-s390/bug.h
-include/asm-s390/ioctls.h
-include/asm-s390/pci.h
-include/asm-s390/percpu.h
-include/asm-s390/spinlock.h
-include/asm-sh/cpu-sh3/cache.h
-include/asm-sh/cpu-sh3/cacheflush.h
-include/asm-sh/cpu-sh3/freq.h
-include/asm-sh/cpu-sh3/timer.h
-include/asm-sh/cpu-sh4/cacheflush.h
-include/asm-sh/cpu-sh4/freq.h
-include/asm-sh/cpu-sh4/timer.h
-include/asm-sh/dreamcast/pci.h
-include/asm-sh/harp/harp.h
-include/asm-sh/ioctls.h
-include/asm-sh/kgdb.h
-include/asm-sh/mc146818rtc.h
-include/asm-sh/microdev/io.h
-include/asm-sh/mmu.h
-include/asm-sh/mmu_context.h
-include/asm-sh/module.h
-include/asm-sh/mpc1211/m1543c.h
-include/asm-sh/overdrive/gt64111.h
-include/asm-sh/param.h
-include/asm-sh/pci.h
-include/asm-sh/pgalloc.h
-include/asm-sh/processor.h
-include/asm-sh/rts7751r2d/rts7751r2d.h
-include/asm-sh/se/se.h
-include/asm-sh/se/smc37c93x.h
-include/asm-sh/sigcontext.h
-include/asm-sh/snapgear/io.h
-include/asm-sh/spinlock.h
-include/asm-sh/timex.h
-include/asm-sh/uaccess.h
-include/asm-sh/ubc.h
-include/asm-sh64/dma.h
-include/asm-sh64/io.h
-include/asm-sh64/ioctls.h
-include/asm-sh64/keyboard.h
-include/asm-sh64/pci.h
-include/asm-sh64/pgalloc.h
-include/asm-sh64/processor.h
-include/asm-sh64/registers.h
-include/asm-sh64/types.h
-include/asm-sparc/bug.h
-include/asm-sparc/highmem.h
-include/asm-sparc/ioctls.h
-include/asm-sparc/pci.h
-include/asm-sparc/pcic.h
-include/asm-sparc/spinlock.h
-include/asm-sparc64/asi.h
-include/asm-sparc64/bug.h
-include/asm-sparc64/ioctls.h
-include/asm-sparc64/pci.h
-include/asm-sparc64/percpu.h
-include/asm-sparc64/ptrace.h
-include/asm-sparc64/thread_info.h
-include/asm-sparc64/upa.h
-include/asm-um/pgtable-3level.h
-include/asm-um/pgtable.h
-include/asm-um/processor-ppc.h
-include/asm-v850/anna.h
-include/asm-v850/as85ep1.h
-include/asm-v850/bug.h
-include/asm-v850/cacheflush.h
-include/asm-v850/dma.h
-include/asm-v850/entry.h
-include/asm-v850/ioctls.h
-include/asm-v850/ma.h
-include/asm-v850/me2.h
-include/asm-v850/pci.h
-include/asm-v850/rte_cb.h
-include/asm-v850/rte_ma1_cb.h
-include/asm-v850/rte_me2_cb.h
-include/asm-v850/rte_nb85e_cb.h
-include/asm-v850/teg.h
-include/asm-v850/v850e2_cache.h
-include/asm-v850/v850e_uarta.h
-include/asm-v850/v850e_uartb.h
-include/asm-x86_64/acpi.h
-include/asm-x86_64/bug.h
-include/asm-x86_64/hpet.h
-include/asm-x86_64/ioctls.h
-include/asm-x86_64/irq.h
-include/asm-x86_64/mce.h
-include/asm-x86_64/mpspec.h
-include/asm-x86_64/nmi.h
-include/asm-x86_64/percpu.h
-include/asm-x86_64/proto.h
-include/asm-x86_64/sparsemem.h
-include/asm-x86_64/suspend.h
-include/asm-xtensa/bitops.h
-include/asm-xtensa/bug.h
-include/asm-xtensa/fixmap.h
-include/asm-xtensa/ioctls.h
-include/asm-xtensa/pgtable.h
-include/asm-xtensa/ptrace.h
-include/asm-xtensa/timex.h
-include/asm-xtensa/xtensa/config-linux_be/core.h
-include/asm-xtensa/xtensa/config-linux_be/system.h
-include/asm-xtensa/xtensa/config-linux_be/tie.h
-include/asm-xtensa/xtensa/hal.h
-include/linux/ac97_codec.h
-include/linux/amifdreg.h
-include/linux/arcdevice.h
-include/linux/atalk.h
-include/linux/audit.h
-include/linux/b1lli.h
-include/linux/bio.h
-include/linux/bootmem.h
-include/linux/capability.h
-include/linux/cciss_ioctl.h
-include/linux/cdrom.h
-include/linux/com20020.h
-include/linux/compat_ioctl.h
-include/linux/config.h
-include/linux/cpu.h
-include/linux/cpumask.h
-include/linux/cpuset.h
-include/linux/crash_dump.h
-include/linux/cycx_x25.h
-include/linux/debugfs.h
-include/linux/devpts_fs.h
-include/linux/dio.h
-include/linux/divert.h
-include/linux/dm-ioctl.h
-include/linux/dmi.h
-include/linux/efi.h
-include/linux/eisa.h
-include/linux/elf-fdpic.h
-include/linux/eventpoll.h
-include/linux/ext3_fs.h
-include/linux/ext3_fs_i.h
-include/linux/ext3_fs_sb.h
-include/linux/ext3_jbd.h
-include/linux/fb.h
-include/linux/fdreg.h
-include/linux/flat.h
-include/linux/fsnotify.h
-include/linux/gameport.h
-include/linux/harrier_defs.h
-include/linux/hdreg.h
-include/linux/hiddev.h
-include/linux/hugetlb.h
-include/linux/i2c.h
-include/linux/i2o-dev.h
-include/linux/i2o.h
-include/linux/if_wanpipe_common.h
-include/linux/input.h
-include/linux/ioctl32.h
-include/linux/ipmi.h
-include/linux/jbd.h
-include/linux/jffs2_fs_sb.h
-include/linux/kernel.h
-include/linux/kexec.h
-include/linux/key.h
-include/linux/kmalloc_sizes.h
-include/linux/kobject.h
-include/linux/kobject_uevent.h
-include/linux/libata.h
-include/linux/mca.h
-include/linux/mii.h
-include/linux/mtd/cfi_endian.h
-include/linux/mtio.h
-include/linux/mv643xx.h
-include/linux/netfilter_bridge/ebt_stp.h
-include/linux/netfilter_ipv4/ip_conntrack_protocol.h
-include/linux/netpoll.h
-include/linux/nfs_fs_sb.h
-include/linux/nfs_xdr.h
-include/linux/nfsd/const.h
-include/linux/nfsd_idmap.h
-include/linux/page-flags.h
-include/linux/pagemap.h
-include/linux/parport_pc.h
-include/linux/pci-acpi.h
-include/linux/percpu.h
-include/linux/pkt_cls.h
-include/linux/pktcdvd.h
-include/linux/pnp.h
-include/linux/pnpbios.h
-include/linux/ps2esdi.h
-include/linux/qic117.h
-include/linux/raw.h
-include/linux/reboot_fixups.h
-include/linux/reiserfs_acl.h
-include/linux/reiserfs_fs.h
-include/linux/reiserfs_fs_sb.h
-include/linux/rslib.h
-include/linux/sdla.h
-include/linux/sdla_asy.h
-include/linux/sdla_chdlc.h
-include/linux/sdla_fr.h
-include/linux/sdla_ppp.h
-include/linux/sdla_x25.h
-include/linux/sdlapci.h
-include/linux/security.h
-include/linux/sem.h
-include/linux/shm.h
-include/linux/sysctl.h
-include/linux/sysfs.h
-include/linux/topology.h
-include/linux/usb_ch9.h
-include/linux/usb_gadget.h
-include/linux/usb_gadgetfs.h
-include/linux/usbdevice_fs.h
-include/linux/vermagic.h
-include/linux/via.h
-include/linux/wanrouter.h
-include/linux/watchdog.h
-include/linux/zorro.h
-include/media/audiochip.h
-include/media/saa7146.h
-include/media/tuner.h
-include/net/act_api.h
-include/net/bluetooth/bluetooth.h
-include/net/bluetooth/hci_core.h
-include/net/dn_fib.h
-include/net/ieee80211.h
-include/net/if_inet6.h
-include/net/ipx.h
-include/net/irda/irlan_event.h
-include/net/llc.h
-include/net/ndisc.h
-include/net/neighbour.h
-include/net/pkt_cls.h
-include/net/pkt_sched.h
-include/net/sctp/constants.h
-include/net/sctp/structs.h
-include/net/tc_act/tc_gact.h
-include/net/xfrm.h
-include/pcmcia/cisreg.h
-include/pcmcia/cistpl.h
-include/pcmcia/cs.h
-include/pcmcia/ds.h
-include/rxrpc/rxrpc.h
-include/scsi/scsi_host.h
-include/sound/ac97_codec.h
-include/sound/ad1816a.h
-include/sound/control.h
-include/sound/core.h
-include/sound/cs4231.h
-include/sound/cs46xx.h
-include/sound/emux_synth.h
-include/sound/gus.h
-include/sound/hdsp.h
-include/sound/hdspm.h
-include/sound/hwdep.h
-include/sound/info.h
-include/sound/initval.h
-include/sound/minors.h
-include/sound/mixer_oss.h
-include/sound/opl3.h
-include/sound/pcm.h
-include/sound/rawmidi.h
-include/sound/sb.h
-include/sound/seq_kernel.h
-include/sound/snd_wavefront.h
-include/sound/uda1341.h
-include/sound/version.h
-include/sound/vx_core.h
-include/sound/ymfpci.h
-include/video/aty128.h
-include/video/cvisionppc.h
-include/video/epson1355.h
-include/video/kyro.h
-include/video/mach64.h
-include/video/neomagic.h
-include/video/newport.h
-include/video/permedia2.h
-include/video/radeon.h
-include/video/s1d13xxxfb.h
-include/video/sgivw.h
-include/video/tdfx.h

Jörn

-- 
The story so far:
In the beginning the Universe was created.  This has made a lot
of people very angry and been widely regarded as a bad move.
-- Douglas Adams?
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