• Peter Zijlstra's avatar
    perf: Robustify event->owner usage and SMP ordering · f47c02c0
    Peter Zijlstra authored
    Use smp_store_release() to clear event->owner and
    lockless_dereference() to observe it. Further use READ_ONCE() for all
    lockless reads.
    
    This changes perf_remove_from_owner() to leave event->owner cleared.
    Signed-off-by: default avatarPeter Zijlstra (Intel) <peterz@infradead.org>
    Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
    Cc: David Ahern <dsahern@gmail.com>
    Cc: Jiri Olsa <jolsa@redhat.com>
    Cc: Linus Torvalds <torvalds@linux-foundation.org>
    Cc: Namhyung Kim <namhyung@kernel.org>
    Cc: Peter Zijlstra <peterz@infradead.org>
    Cc: Stephane Eranian <eranian@google.com>
    Cc: Thomas Gleixner <tglx@linutronix.de>
    Cc: Vince Weaver <vincent.weaver@maine.edu>
    Signed-off-by: default avatarIngo Molnar <mingo@kernel.org>
    f47c02c0
core.c 221 KB