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03fae44b41
One was that ORC didn't know how to handle the ftrace callbacks in general (which Josh fixed). The other was that ORC would just bail if it hit a dynamically allocated trampoline. Which means all ftrace stack tracing that happens from the function tracer would produce no results (that includes killing the max stack size tracer). I added a check to the ORC unwinder to see if the trampoline belonged to ftrace, and if it did, use the orc entry of the static trampoline that was used to create the dynamic one (it would be identical). Finally, I noticed that the skip values of the stack tracing were out of whack. I went through and fixed them up. -----BEGIN PGP SIGNATURE----- iQHIBAABCgAyFiEEPm6V/WuN2kyArTUe1a05Y9njSUkFAlpohNcUHHJvc3RlZHRA Z29vZG1pcy5vcmcACgkQ1a05Y9njSUnJ4wv/evoOzbuF67P1N1ci9qjtAuUzOGMA jr/x/kHj/jE+w5diXTw0XOlaWzK6tB8BEfaVVcljjjjUdoXzULXCv5zR59ARioio VhnTt1VPr+4fc5huTcIXYf8NXTNoqzLVBIR7+iO9Qk1v5nwFcJjQThj42enCXQR4 sHdeOGpW4N8UKZ1yw+i95a/JibLbnwiQRQRtMXOqxvJiplJsytWlqZkVsOyMFwA9 X+X6FbBAJYwSktMvcEXvvq7BGTuCEJF2R6+P0M40yjBLkJKxa4knM39/zt8DiZFl bTu9JGfo1uEuMR3I+l7pxNOcPY/8rYbkWS7GAjXxMZk8Zb7iHxaQeQyJSeJbUhaV ZS+dWVv6zkDvE1Lf0jdeyfjN8HzEZUTYRaFvDZ6JhuykxcJzCLef23uW8laheghO w58JpwzzVliPe3Iw9E4z8isEeXCU9FYGoxu8NvkP13O72j7D5ZnwwhGAAbgtmYpL Ez92F0JIh3bNdpEJ7XgJG9ZF9uIhRoGI+D9l =JDuB -----END PGP SIGNATURE----- Merge tag 'trace-v4.15-rc9' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace Pull tracing fixes from Steven Rostedt: "With the new ORC unwinder, ftrace stack tracing became disfunctional. One was that ORC didn't know how to handle the ftrace callbacks in general (which Josh fixed). The other was that ORC would just bail if it hit a dynamically allocated trampoline. Which means all ftrace stack tracing that happens from the function tracer would produce no results (that includes killing the max stack size tracer). I added a check to the ORC unwinder to see if the trampoline belonged to ftrace, and if it did, use the orc entry of the static trampoline that was used to create the dynamic one (it would be identical). Finally, I noticed that the skip values of the stack tracing were out of whack. I went through and fixed them up" * tag 'trace-v4.15-rc9' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace: tracing: Update stack trace skipping for ORC unwinder ftrace, orc, x86: Handle ftrace dynamically allocated trampolines x86/ftrace: Fix ORC unwinding from ftrace handlers |
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