Messages in this thread Patch in this message | | | Date | Mon, 7 Oct 2002 00:26:47 +0200 (MET DST) | From | Mikael Pettersson <> | Subject | Re: 2.5.40: problem with configuration system |
| |
On Sun, 6 Oct 2002 16:28:09 -0500 (CDT), Thomas Molina wrote: >I was configuring a kernel for a rescue disk, so lots of things were not >configured that normally would be. At the end of the compile I get: > >arch/i386/kernel/built-in.o: In function `MP_processor_info': >arch/i386/kernel/built-in.o(.text.init+0x31ab): undefined reference to >`Dprintk' ... ># CONFIG_DEBUG_KERNEL is not set >CONFIG_X86_EXTRA_IRQS=y >CONFIG_X86_FIND_SMP_CONFIG=y >CONFIG_X86_MPPARSE=y > >The thing I don't understand is why they should be set to y. My >understanding from reading the source is that they should only be y if >CONFIG_X86_LOCAL_APIC is y. That should only happen if CONFIG_SMP is not >y and CONFIG_X86_UP_APIC is y. The enclosed .config file shows this isn't >the case. What am I missing?
This happened to me recently when I copied a .config which had UP_APIC=y and used make config to disable UP_APIC. The problem in my case was that the good ole' Configure script doesn't always reach a fixpoint in one iteration: the fact that LOCAL_APIC=y at the start is sufficient for it to emit MPPARSE=y at the end, even though LOCAL_APIC got disabled. A 'make oldconfig' should fix the situation.
This is not the only case where Configure gets it wrong. There is a bug involving dep_tristate, forward dependencies, and toggling module support which I reported to LKML ages ago (with a fix), but nobody cared so... FWIW, the fix to that bug is included below.
/Mikael
--- linux-2.5.40/scripts/Configure.~1~ Thu Oct 3 00:00:00 2002 +++ linux-2.5.40/scripts/Configure Thu Oct 3 18:32:20 2002 @@ -316,7 +316,13 @@ return ;; m) - need_module=1 + # Note: "m" means "module" only when CONFIG_MODULES=y, + # otherwise it really means "y". This matters when + # a dep_tristate dependency is a forward reference + # which we haven't yet "corrected" from "m" to "y". + if [ "$CONFIG_MODULES" = "y" ]; then + need_module=1 + fi ;; esac shift - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |