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    Subject[tip:perf/core] ftrace: Change filter/ notrace set functions to return exit code
    Commit-ID:  ac483c446b67870444c9eeaf8325d3d2af9b91bc
    Gitweb: http://git.kernel.org/tip/ac483c446b67870444c9eeaf8325d3d2af9b91bc
    Author: Jiri Olsa <jolsa@redhat.com>
    AuthorDate: Mon, 2 Jan 2012 10:04:14 +0100
    Committer: Steven Rostedt <rostedt@goodmis.org>
    CommitDate: Fri, 3 Feb 2012 09:48:18 -0500

    ftrace: Change filter/notrace set functions to return exit code

    Currently the ftrace_set_filter and ftrace_set_notrace functions
    do not return any return code. So there's no way for ftrace_ops
    user to tell wether the filter was correctly applied.

    The set_ftrace_filter interface returns error in case the filter
    did not match:

    # echo krava > set_ftrace_filter
    bash: echo: write error: Invalid argument

    Changing both ftrace_set_filter and ftrace_set_notrace functions
    to return zero if the filter was applied correctly or -E* values
    in case of error.

    Link: http://lkml.kernel.org/r/1325495060-6402-2-git-send-email-jolsa@redhat.com

    Acked-by: Frederic Weisbecker <fweisbec@gmail.com>
    Signed-off-by: Jiri Olsa <jolsa@redhat.com>
    Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
    ---
    include/linux/ftrace.h | 4 ++--
    kernel/trace/ftrace.c | 15 +++++++++------
    2 files changed, 11 insertions(+), 8 deletions(-)

    diff --git a/include/linux/ftrace.h b/include/linux/ftrace.h
    index 028e26f..f33fb3b 100644
    --- a/include/linux/ftrace.h
    +++ b/include/linux/ftrace.h
    @@ -178,9 +178,9 @@ struct dyn_ftrace {
    };

    int ftrace_force_update(void);
    -void ftrace_set_filter(struct ftrace_ops *ops, unsigned char *buf,
    +int ftrace_set_filter(struct ftrace_ops *ops, unsigned char *buf,
    int len, int reset);
    -void ftrace_set_notrace(struct ftrace_ops *ops, unsigned char *buf,
    +int ftrace_set_notrace(struct ftrace_ops *ops, unsigned char *buf,
    int len, int reset);
    void ftrace_set_global_filter(unsigned char *buf, int len, int reset);
    void ftrace_set_global_notrace(unsigned char *buf, int len, int reset);
    diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
    index 683d559..e2e0597 100644
    --- a/kernel/trace/ftrace.c
    +++ b/kernel/trace/ftrace.c
    @@ -3146,8 +3146,10 @@ ftrace_set_regex(struct ftrace_ops *ops, unsigned char *buf, int len,
    mutex_lock(&ftrace_regex_lock);
    if (reset)
    ftrace_filter_reset(hash);
    - if (buf)
    - ftrace_match_records(hash, buf, len);
    + if (buf && !ftrace_match_records(hash, buf, len)) {
    + ret = -EINVAL;
    + goto out_regex_unlock;
    + }

    mutex_lock(&ftrace_lock);
    ret = ftrace_hash_move(ops, enable, orig_hash, hash);
    @@ -3157,6 +3159,7 @@ ftrace_set_regex(struct ftrace_ops *ops, unsigned char *buf, int len,

    mutex_unlock(&ftrace_lock);

    + out_regex_unlock:
    mutex_unlock(&ftrace_regex_lock);

    free_ftrace_hash(hash);
    @@ -3173,10 +3176,10 @@ ftrace_set_regex(struct ftrace_ops *ops, unsigned char *buf, int len,
    * Filters denote which functions should be enabled when tracing is enabled.
    * If @buf is NULL and reset is set, all functions will be enabled for tracing.
    */
    -void ftrace_set_filter(struct ftrace_ops *ops, unsigned char *buf,
    +int ftrace_set_filter(struct ftrace_ops *ops, unsigned char *buf,
    int len, int reset)
    {
    - ftrace_set_regex(ops, buf, len, reset, 1);
    + return ftrace_set_regex(ops, buf, len, reset, 1);
    }
    EXPORT_SYMBOL_GPL(ftrace_set_filter);

    @@ -3191,10 +3194,10 @@ EXPORT_SYMBOL_GPL(ftrace_set_filter);
    * is enabled. If @buf is NULL and reset is set, all functions will be enabled
    * for tracing.
    */
    -void ftrace_set_notrace(struct ftrace_ops *ops, unsigned char *buf,
    +int ftrace_set_notrace(struct ftrace_ops *ops, unsigned char *buf,
    int len, int reset)
    {
    - ftrace_set_regex(ops, buf, len, reset, 0);
    + return ftrace_set_regex(ops, buf, len, reset, 0);
    }
    EXPORT_SYMBOL_GPL(ftrace_set_notrace);
    /**

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