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    SubjectRe: [PATCH 06/11] ftrace: add ftrace warn on to disable ftrace
    On Wed, 22 Oct 2008 14:43:19 -0400
    Steven Rostedt <rostedt@goodmis.org> wrote:

    > Add ftrace warn on to disable ftrace as well as report a warning.
    >
    > Signed-off-by: Steven Rostedt <srostedt@redhat.com>
    > ---
    > kernel/trace/ftrace.c | 29 ++++++++++++++++++++++-------
    > 1 file changed, 22 insertions(+), 7 deletions(-)
    >
    > Index: linux-compile.git/kernel/trace/ftrace.c
    > ===================================================================
    > --- linux-compile.git.orig/kernel/trace/ftrace.c 2008-10-22 13:17:29.000000000 -0400
    > +++ linux-compile.git/kernel/trace/ftrace.c 2008-10-22 13:20:11.000000000 -0400
    > @@ -32,6 +32,24 @@
    >
    > #include "trace.h"
    >
    > +#define FTRACE_WARN_ON(cond) \
    > + do { \
    > + if (unlikely(cond)) { \
    > + WARN_ON(1); \
    > + ftrace_kill(); \
    > + } \
    > + } while (0)

    This could be coded as

    if (WARN_ON(cond))
    ftrace_kill();

    > +#define FTRACE_WARN_ON_ONCE(cond) \
    > + do { \
    > + static int once; \
    > + if (unlikely(cond) && !once) { \
    > + once++; \
    > + WARN_ON(1); \
    > + ftrace_kill(); \
    > + } \
    > + } while (0)


    if (WARN_ON_ONCE(cond))
    ftrace_kill();




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