On Fri, Oct 18, 2013 at 10:21:16PM +0800, Axel Lin wrote: > 2013/10/18 Michael S. Tsirkin <m...@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
Shouldn't might_fault return 0 if !CONFIG_MMU? No mmu->no fault ... -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
