• Frederic Weisbecker's avatar
    tracing: Use the perf recursion protection from trace event · ce71b9df
    Frederic Weisbecker authored
    
    
    When we commit a trace to perf, we first check if we are
    recursing in the same buffer so that we don't mess-up the buffer
    with a recursing trace. But later on, we do the same check from
    perf to avoid commit recursion. The recursion check is desired
    early before we touch the buffer but we want to do this check
    only once.
    
    Then export the recursion protection from perf and use it from
    the trace events before submitting a trace.
    
    v2: Put appropriate Reported-by tag
    Reported-by: default avatarPeter Zijlstra <peterz@infradead.org>
    Signed-off-by: default avatarFrederic Weisbecker <fweisbec@gmail.com>
    Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
    Cc: Paul Mackerras <paulus@samba.org>
    Cc: Steven Rostedt <rostedt@goodmis.org>
    Cc: Masami Hiramatsu <mhiramat@redhat.com>
    Cc: Jason Baron <jbaron@redhat.com>
    LKML-Reference: <1258864015-10579-1-git-send-email-fweisbec@gmail.com>
    Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
    ce71b9df
ftrace_event.h 5.69 KB