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| author | Abhishek Sagar <sagar.abhishek@gmail.com> | 2008-06-14 06:29:39 (GMT) |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-06-14 06:32:29 (GMT) |
| commit | a4500b84c51645bbc86be3ca84f2252b7ada060f (patch) | |
| tree | 4f11488be2c6a7f89762ce800c77d888d540fb1a | |
| parent | 20764ff1efb440640353053ec83263e69e1259e0 (diff) | |
| download | linux-a4500b84c51645bbc86be3ca84f2252b7ada060f.tar.xz | |
ftrace: fix "notrace" filtering priority
This is a fix to give notrace filter rules priority over "set_ftrace_filter"
rules.
This fix ensures that functions which are set to be filtered and are
concurrently marked as "notrace" don't get recorded. As of now, if
a record is marked as FTRACE_FL_FILTER and is enabled, then the notrace
flag is not checked. Tested on x86-32.
Signed-off-by: Abhishek Sagar <sagar.abhishek@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
| -rw-r--r-- | kernel/trace/ftrace.c | 12 |
1 files changed, 9 insertions, 3 deletions
diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c index 0118979..b532e4a 100644 --- a/kernel/trace/ftrace.c +++ b/kernel/trace/ftrace.c @@ -355,20 +355,26 @@ __ftrace_replace_code(struct dyn_ftrace *rec, * If this record is set not to trace then * do nothing. * + * If this record is set not to trace and + * it is enabled then disable it. + * * If this record is not set to be filtered and * it is enabled, disable it. */ - fl = rec->flags & (FTRACE_FL_FILTER | FTRACE_FL_ENABLED); + + fl = rec->flags & (FTRACE_FL_FILTER | FTRACE_FL_NOTRACE | + FTRACE_FL_ENABLED); if ((fl == (FTRACE_FL_FILTER | FTRACE_FL_ENABLED)) || - (fl == 0) || (rec->flags & FTRACE_FL_NOTRACE)) + (fl == (FTRACE_FL_FILTER | FTRACE_FL_NOTRACE)) || + !fl || (fl == FTRACE_FL_NOTRACE)) return 0; /* * If it is enabled disable it, * otherwise enable it! */ - if (fl == FTRACE_FL_ENABLED) { + if (fl & FTRACE_FL_ENABLED) { /* swap new and old */ new = old; old = ftrace_call_replace(ip, FTRACE_ADDR); |