On 2018-11-02, Aleksa Sarai <cyphar@xxxxxxxxxx> wrote: > Unfortunately, I'm having a lot of trouble understanding how the current > ftrace hooking works -- ORC has a couple of ftrace hooks that seem > reasonable on the surface but I don't understand (for instance) how > HAVE_FUNCTION_GRAPH_RET_ADDR_PTR *actually* works. Though your comment > appears to indicate that it doesn't work for stack traces? Sorry, I just figured out how it works! (To make sure I actually understand -- retp is a pointer to the place in the stack where the return address is stored, so it uniquely specifies what each trampoline actually points to -- this trick could also be used for kretprobes). -- Aleksa Sarai Senior Software Engineer (Containers) SUSE Linux GmbH <https://www.cyphar.com/>
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