[ I got an error with linux-arm-ker...@list.infradead.org and had to remove from CC ]
On Fri, 2013-01-25 at 16:26 +0000, Dave Martin wrote: > However, if the purpose if making return_address() notrace is just to > prevent infinite recursion, where finite recursion is safe, then it > feels fixable as described above. > > Steven, do you know whether such an approach might be safe? > I rewrote the function trace recursion code (see linux-next). The function tracer wont recurse on itself. If the return_address() is only used by callbacks and not directly by the mcount(ftrace_caller), then after the first trace, ftrace wont let recursion of the callback. IOW, callbacks of ftrace don't need to worry about re-entrancy at the same context level (but do for different contexts, ie. normal, irq, softirq and NMI). (commit edc15cafcbfa3d73f819cae99885a2e35e4cbce5 in linux-next and friends) -- Steve -- 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/
