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    Subject[PATCH 2/6] tracing/function-graph-tracer: Drop the useless nmi protection
    Date
    The function graph tracer used to have a protection against NMI
    while entering a function entry tracing. But this is useless now,
    this tracer is reentrant and the ring buffer supports the NMI tracing.
    We can then drop this protection.

    Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
    Cc: Steven Rostedt <rostedt@goodmis.org>
    ---
    arch/x86/kernel/ftrace.c | 4 ----
    1 files changed, 0 insertions(+), 4 deletions(-)

    diff --git a/arch/x86/kernel/ftrace.c b/arch/x86/kernel/ftrace.c
    index d94e1ea..8e96634 100644
    --- a/arch/x86/kernel/ftrace.c
    +++ b/arch/x86/kernel/ftrace.c
    @@ -417,10 +417,6 @@ void prepare_ftrace_return(unsigned long *parent, unsigned long self_addr,
    unsigned long return_hooker = (unsigned long)
    &return_to_handler;

    - /* Nmi's are currently unsupported */
    - if (unlikely(in_nmi()))
    - return;
    -
    if (unlikely(atomic_read(&current->tracing_graph_pause)))
    return;

    --
    1.6.2.3


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