Messages in this thread | | | Date | Fri, 18 Oct 2013 22:21:16 +0800 | Subject | Re: Build error for nommu if CONFIG_DEBUG_ATOMIC_SLEEP is selected | From | Axel Lin <> |
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2013/10/18 Michael S. Tsirkin <mst@redhat.com>: > On Fri, Oct 18, 2013 at 05:27:55PM +0800, Axel Lin wrote: >> Hi Michael, >> >> I got below build error for nommu if CONFIG_DEBUG_ATOMIC_SLEEP is selected. >> Also got the same build error if CONFIG_PROVE_LOCKING is selected. >> >> Seems this issue is introduced by commit 662bbcb2747c2 >> "mm, sched: Allow uaccess in atomic with pagefault_disable()". >> >> arch/arm/kernel/built-in.o: In function `arch_ptrace': >> arch/arm/kernel/ptrace.c:852: undefined reference to `might_fault' >> arch/arm/kernel/built-in.o: In function `restore_sigframe': >> arch/arm/kernel/signal.c:173: undefined reference to `might_fault' >> arch/arm/kernel/signal.c:174: undefined reference to `might_fault' >> arch/arm/kernel/signal.c:175: undefined reference to `might_fault' >> arch/arm/kernel/signal.c:176: undefined reference to `might_fault' >> arch/arm/kernel/built-in.o:arch/arm/kernel/signal.c:177: more undefined references to `might_fault' follow >> make: *** [vmlinux] Error 1 >> >> Regards, >> Axel > > Can you send/upload your full .config please?
I patch the kernel to port it for an arm7tdmi SoC. But I think you can easily reproduce it by simply select ARM7TDMI cpu and then enable either CONFIG_DEBUG_ATOMIC_SLEEP or CONFIG_PROVE_LOCKING.
Note, might_fault is implemented in mm/memory.c which is not built if !CONFIG_MMU.
Regards, Axel
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