On Thu, 3 Oct 2024 11:16:32 -0400 Mathieu Desnoyers <mathieu.desnoyers@xxxxxxxxxxxx> wrote: > In preparation for allowing system call enter/exit instrumentation to > handle page faults, make sure that ftrace can handle this change by > explicitly disabling preemption within the ftrace system call tracepoint > probes to respect the current expectations within ftrace ring buffer > code. The ftrace ring buffer doesn't expect preemption being disabled before use. It will explicitly disable preemption. I don't think this patch is needed. -- Steve > > This change does not yet allow ftrace to take page faults per se within > its probe, but allows its existing probes to adapt to the upcoming > change. > > Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@xxxxxxxxxxxx> > Acked-by: Masami Hiramatsu (Google) <mhiramat@xxxxxxxxxx> > Cc: Michael Jeanson <mjeanson@xxxxxxxxxxxx> > Cc: Steven Rostedt <rostedt@xxxxxxxxxxx> > Cc: Masami Hiramatsu <mhiramat@xxxxxxxxxx> > Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx> > Cc: Alexei Starovoitov <ast@xxxxxxxxxx> > Cc: Yonghong Song <yhs@xxxxxx> > Cc: Paul E. McKenney <paulmck@xxxxxxxxxx> > Cc: Ingo Molnar <mingo@xxxxxxxxxx> > Cc: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx> > Cc: Mark Rutland <mark.rutland@xxxxxxx> > Cc: Alexander Shishkin <alexander.shishkin@xxxxxxxxxxxxxxx> > Cc: Namhyung Kim <namhyung@xxxxxxxxxx> > Cc: Andrii Nakryiko <andrii.nakryiko@xxxxxxxxx> > Cc: bpf@xxxxxxxxxxxxxxx > Cc: Joel Fernandes <joel@xxxxxxxxxxxxxxxxx>
