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| author | Steven Rostedt (Google) <rostedt@goodmis.org> | 2024-06-05 20:03:38 +0200 |
|---|---|---|
| committer | Steven Rostedt (Google) <rostedt@goodmis.org> | 2024-06-06 21:21:28 +0200 |
| commit | 1a88c071679496907ba3e62ec1190d198c20ace8 (patch) | |
| tree | 48624826b71fb80fb5bb31d442b532114bb9b1dd /kernel/trace/ftrace.c | |
| parent | ftrace: Add comments to ftrace_hash_rec_disable/enable() (diff) | |
| download | linux-1a88c071679496907ba3e62ec1190d198c20ace8.tar.xz linux-1a88c071679496907ba3e62ec1190d198c20ace8.zip | |
ftrace: Convert "inc" parameter to bool in ftrace_hash_rec_update_modify()
The parameter "inc" in the function ftrace_hash_rec_update_modify() is
boolean. Change it to be such.
Also add documentation to what the function does.
Link: https://lore.kernel.org/linux-trace-kernel/20240605180409.021080462@goodmis.org
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Acked-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Diffstat (limited to 'kernel/trace/ftrace.c')
| -rw-r--r-- | kernel/trace/ftrace.c | 23 |
1 files changed, 20 insertions, 3 deletions
diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c index 4140d0ce25f1..256b5e07c39a 100644 --- a/kernel/trace/ftrace.c +++ b/kernel/trace/ftrace.c @@ -1883,7 +1883,24 @@ static bool ftrace_hash_rec_enable(struct ftrace_ops *ops) return __ftrace_hash_rec_update(ops, true); } -static void ftrace_hash_rec_update_modify(struct ftrace_ops *ops, int inc) +/* + * This function will update what functions @ops traces when its filter + * changes. + * + * The @inc states if the @ops callbacks are going to be added or removed. + * When one of the @ops hashes are updated to a "new_hash" the dyn_ftrace + * records are update via: + * + * ftrace_hash_rec_disable_modify(ops); + * ops->hash = new_hash + * ftrace_hash_rec_enable_modify(ops); + * + * Where the @ops is removed from all the records it is tracing using + * its old hash. The @ops hash is updated to the new hash, and then + * the @ops is added back to the records so that it is tracing all + * the new functions. + */ +static void ftrace_hash_rec_update_modify(struct ftrace_ops *ops, bool inc) { struct ftrace_ops *op; @@ -1907,12 +1924,12 @@ static void ftrace_hash_rec_update_modify(struct ftrace_ops *ops, int inc) static void ftrace_hash_rec_disable_modify(struct ftrace_ops *ops) { - ftrace_hash_rec_update_modify(ops, 0); + ftrace_hash_rec_update_modify(ops, false); } static void ftrace_hash_rec_enable_modify(struct ftrace_ops *ops) { - ftrace_hash_rec_update_modify(ops, 1); + ftrace_hash_rec_update_modify(ops, true); } /* |