From: Frederik Deweerdt On Fri, Sep 08, 2006 at 01:13:17AM -0700, Andrew Morton wrote: > > ftp://ftp.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.18-rc6/2.6.18-rc6-mm1/ > Hi, 2.6.18-rc6-mm1 fails to build on x86 with !CONFIG_SMP with the following message: CHK include/linux/version.h CHK include/linux/utsrelease.h CHK include/linux/compile.h UPD include/linux/compile.h CC init/version.o LD init/built-in.o CC arch/i386/kernel/cpu/common.o arch/i386/kernel/cpu/common.c: In function `init_gdt': arch/i386/kernel/cpu/common.c:667: warning: implicit declaration of function `early_smp_processor_id' LD arch/i386/kernel/cpu/built-in.o LD arch/i386/kernel/built-in.o GEN .version CHK include/linux/compile.h UPD include/linux/compile.h CC init/version.o LD init/built-in.o LD .tmp_vmlinux1 arch/i386/kernel/built-in.o: In function `init_gdt': arch/i386/kernel/cpu/common.c:667: undefined reference to `early_smp_processor_id' arch/i386/kernel/built-in.o: In function `cpu_init': arch/i386/kernel/cpu/common.c:737: undefined reference to `early_smp_processor_id' make: *** [.tmp_vmlinux1] Error 1 We need to include to define early_smp_processor_id(). Signed-off-by: Frederik Deweerdt Cc: Jeremy Fitzhardinge Cc: Andi Kleen Cc: Chuck Ebbert <76306.1226@compuserve.com> Cc: Zachary Amsden Cc: Jan Beulich Cc: Andi Kleen Signed-off-by: Andrew Morton --- arch/i386/kernel/cpu/common.c | 1 + 1 file changed, 1 insertion(+) diff -puN arch/i386/kernel/cpu/common.c~fix-x86_64-mm-i386-pda-smp-processorid-2 arch/i386/kernel/cpu/common.c --- a/arch/i386/kernel/cpu/common.c~fix-x86_64-mm-i386-pda-smp-processorid-2 +++ a/arch/i386/kernel/cpu/common.c @@ -13,6 +13,7 @@ #include #include #include +#include #ifdef CONFIG_X86_LOCAL_APIC #include #include _