2009/10/25 Wu Zhangjin <wuzhangjin@xxxxxxxxx>: > This patch fix the following error with FUNCTION_GRAPH_TRACER=y: > > kernel/built-in.o: In function `print_graph_irq': > trace_functions_graph.c:(.text+0x6dba0): undefined reference to `__irqentry_text_start' > trace_functions_graph.c:(.text+0x6dba8): undefined reference to `__irqentry_text_start' > trace_functions_graph.c:(.text+0x6dbd0): undefined reference to `__irqentry_text_end' > trace_functions_graph.c:(.text+0x6dbd4): undefined reference to `__irqentry_text_end' > > (This patch is need to support function graph tracer of MIPS) If you want to enjoy this section, you'd need to tag the mips irq entry functions with "__irq_entry" :) I guess there is a do_IRQ() in mips that is waiting for that (and probably some others). The effect is that interrupt areas are cut with a pair of arrows in the trace, so that you more easily spot interrupts in the traces May be I missed this part in another patch in this series though...
