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    Subject[PATCH 12/13] batman-adv: tracing: Use the new __vstring() helper
    From: "Steven Rostedt (Google)" <rostedt@goodmis.org>

    Instead of open coding a __dynamic_array() with a fixed length (which
    defeats the purpose of the dynamic array in the first place). Use the new
    __vstring() helper that will use a va_list and only write enough of the
    string into the ring buffer that is needed.

    Cc: Marek Lindner <mareklindner@neomailbox.ch>
    Cc: Simon Wunderlich <sw@simonwunderlich.de>
    Cc: Antonio Quartulli <a@unstable.cc>
    Cc: Sven Eckelmann <sven@narfation.org>
    Cc: "David S. Miller" <davem@davemloft.net>
    Cc: Eric Dumazet <edumazet@google.com>
    Cc: Jakub Kicinski <kuba@kernel.org>
    Cc: Paolo Abeni <pabeni@redhat.com>
    Cc: b.a.t.m.a.n@lists.open-mesh.org
    Cc: netdev@vger.kernel.org
    Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
    ---
    net/batman-adv/trace.h | 7 ++-----
    1 file changed, 2 insertions(+), 5 deletions(-)

    diff --git a/net/batman-adv/trace.h b/net/batman-adv/trace.h
    index d673ebdd0426..67d2a8a0196c 100644
    --- a/net/batman-adv/trace.h
    +++ b/net/batman-adv/trace.h
    @@ -40,16 +40,13 @@ TRACE_EVENT(batadv_dbg,
    TP_STRUCT__entry(
    __string(device, bat_priv->soft_iface->name)
    __string(driver, KBUILD_MODNAME)
    - __dynamic_array(char, msg, BATADV_MAX_MSG_LEN)
    + __vstring(msg, vaf->fmt, vaf->va)
    ),

    TP_fast_assign(
    __assign_str(device, bat_priv->soft_iface->name);
    __assign_str(driver, KBUILD_MODNAME);
    - WARN_ON_ONCE(vsnprintf(__get_dynamic_array(msg),
    - BATADV_MAX_MSG_LEN,
    - vaf->fmt,
    - *vaf->va) >= BATADV_MAX_MSG_LEN);
    + __assign_vstr(msg, vaf->fmt, vaf->va);
    ),

    TP_printk(
    --
    2.35.1
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