On Mon, Aug 15, 2022 at 8:41 AM Peter Zijlstra <peterz@xxxxxxxxxxxxx> wrote: > > On Mon, Aug 15, 2022 at 05:28:02PM +0200, Peter Zijlstra wrote: > > On Mon, Aug 15, 2022 at 08:17:42AM -0700, Alexei Starovoitov wrote: > > > It's hiding a fake function from ftrace, since it's not a function > > > and ftrace infra shouldn't show it tracing logs. > > > In other words it's a _notrace_ function with nop5. > > > > Then make it a notrace function with a nop5 in it. That isn't hard. > > > > The whole problem is that it isn't a notrace function and you're abusing > > a __fentry__ site. > > https://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git/commit/?h=x86/fineibt&id=8d075bdf11193f1d276bf19fa56b4b8dfe24df9e Brand new stuff. Awesome. That should fit perfectly. > foo.c: > > __attribute__((__no_instrument_function__)) > __attribute__((patchable_function_entry(5))) Interesting. Didn't know about this attribute. > void my_func(void) > { > } > > void my_foo(void) > { > } Great. Jiri, could you please revise your patch with this approach?
