On Wed, 28 Nov 2018 09:12:39 +0100 Anders Roxell <[email protected]> wrote:
> Since __sanitizer_cov_trace_pc is marked as notrace, function calls in > __sanitizer_cov_trace_pc shouldn't be traced either. The function > ftrace_graph_caller() gets called for each function that isn't marked > 'notrace', like canonicalize_ip(). This is the call trace from a run: > > [ 139.644550] ftrace_graph_caller+0x1c/0x24 > [ 139.648352] canonicalize_ip+0x18/0x28 > [ 139.652313] __sanitizer_cov_trace_pc+0x14/0x58 > [ 139.656184] sched_clock+0x34/0x1e8 > [ 139.659759] trace_clock_local+0x40/0x88 > [ 139.663722] ftrace_push_return_trace+0x8c/0x1f0 > [ 139.667767] prepare_ftrace_return+0xa8/0x100 > [ 139.671709] ftrace_graph_caller+0x1c/0x24 > > Rework so that the functions check_kcov_mode and canonicalize_ip that is > callef from __sanitizer_cov_trace_pc also is marked as notrace. > > Co-developed-by: Arnd Bergmann <[email protected]> > Signed-off-by: Arnd Bergmann <[email protected]> > Signen-off-by: Anders Roxell <[email protected]> > --- Acked-by: Steven Rostedt (VMware) <[email protected]> -- Steve
