From: Stephen Rothwell <sfr@xxxxxxxxxxxxxxxx> Date: Mon, 9 Jan 2012 16:59:50 +1100 >> > include/trace/events/kmem.h:267:1: error: implicit declaration of function 'check_trace_callback_type_mm_page_alloc_extfrag' [-Werror=implicit-function-declaration] >> > In file included from include/trace/ftrace.h:774:0, >> > from include/trace/define_trace.h:86, >> > from include/trace/events/power.h:240, >> > from kernel/trace/power-traces.c:14: >> > include/trace/events/kmem.h: In function 'perf_test_probe_mm_page_pcpu_drain': >> > include/trace/events/kmem.h:256:1: error: implicit declaration of function 'check_trace_callback_type_mm_page_pcpu_drain' [-Werror=implicit-function-declaration] I think the problem has to do with slab_def.h's explicit inclusion of trace/kmem.h If this somehow gets included while we are expanding define_trace.h, then TRACE_SYSTEM will get redefined and screw up all of the includes that define_trace.h is trying to perform for the sake of power.h Other architectures probably hit slab_def.h via some earlier includes and therefore don't hit this situation like Sparc does. Adding an explicit <linux/slab.h> include to power-traces.c indeed fixes the build. -- To unsubscribe from this list: send the line "unsubscribe linux-next" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
