I get the following compile error with ftrace with mainline with the
attached config (made with randconfig)

/home/mikey/src/linux-2.6-ozlabs/arch/powerpc/kernel/ftrace.c: In function ‘__ftrace_make_call’:
/home/mikey/src/linux-2.6-ozlabs/arch/powerpc/kernel/ftrace.c:443: error: dereferencing pointer to incomplete type
/home/mikey/src/linux-2.6-ozlabs/arch/powerpc/kernel/ftrace.c:443: error: dereferencing pointer to incomplete type
/home/mikey/src/linux-2.6-ozlabs/arch/powerpc/kernel/ftrace.c:443: error: dereferencing pointer to incomplete type
/home/mikey/src/linux-2.6-ozlabs/arch/powerpc/kernel/ftrace.c:450: error: dereferencing pointer to incomplete type

Mikey