linux-kernel - [PATCH 3/5] ftrace: Remove "filter_hash" parameter from ftrace_hash_rec

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Date: Tue, 04 Jun 2024 17:28:20 -0400
From: Steven Rostedt <rostedt@...dmis.org>
To: linux-kernel@...r.kernel.org,
 linux-trace-kernel@...r.kernel.org
Cc: Masami Hiramatsu <mhiramat@...nel.org>,
 Mark Rutland <mark.rutland@....com>,
 Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
 Andrew Morton <akpm@...ux-foundation.org>
Subject: [PATCH 3/5] ftrace: Remove "filter_hash" parameter from
 ftrace_hash_rec_disable/enable()

From: "Steven Rostedt (Google)" <rostedt@...dmis.org>

The functions ftrace_hash_rec_disable() and ftrace_hash_rec_enable()
always has 1 passed to its "ftrace_hash" parameter. Remove the parameter
and pass in true to __ftrace_hash_rec_update().

Also add some comments to both those functions explaining what they do.

Signed-off-by: Steven Rostedt (Google) <rostedt@...dmis.org>
---
 kernel/trace/ftrace.c | 24 ++++++++++++++++--------
 1 file changed, 16 insertions(+), 8 deletions(-)

diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index 93c7c5fd4249..de652201c86c 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -1895,16 +1895,24 @@ static bool __ftrace_hash_rec_update(struct ftrace_ops *ops,
 	return update;
 }
 
-static bool ftrace_hash_rec_disable(struct ftrace_ops *ops,
-				    int filter_hash)
+/*
+ * This is called when an ops is removed from tracing. It will decrement
+ * the counters of the dyn_ftrace records for all the functions that
+ * the @ops attached to.
+ */
+static bool ftrace_hash_rec_disable(struct ftrace_ops *ops)
 {
-	return __ftrace_hash_rec_update(ops, filter_hash, 0);
+	return __ftrace_hash_rec_update(ops, true, 0);
 }
 
-static bool ftrace_hash_rec_enable(struct ftrace_ops *ops,
-				   int filter_hash)
+/*
+ * This is called when an ops is added to tracing. It will increment
+ * the counters of the dyn_ftrace records for all the functions that
+ * the @ops attached to.
+ */
+static bool ftrace_hash_rec_enable(struct ftrace_ops *ops)
 {
-	return __ftrace_hash_rec_update(ops, filter_hash, 1);
+	return __ftrace_hash_rec_update(ops, true, 1);
 }
 
 static void ftrace_hash_rec_update_modify(struct ftrace_ops *ops,
@@ -3062,7 +3070,7 @@ int ftrace_startup(struct ftrace_ops *ops, int command)
 		return ret;
 	}
 
-	if (ftrace_hash_rec_enable(ops, 1))
+	if (ftrace_hash_rec_enable(ops))
 		command |= FTRACE_UPDATE_CALLS;
 
 	ftrace_startup_enable(command);
@@ -3104,7 +3112,7 @@ int ftrace_shutdown(struct ftrace_ops *ops, int command)
 	/* Disabling ipmodify never fails */
 	ftrace_hash_ipmodify_disable(ops);
 
-	if (ftrace_hash_rec_disable(ops, 1))
+	if (ftrace_hash_rec_disable(ops))
 		command |= FTRACE_UPDATE_CALLS;
 
 	ops->flags &= ~FTRACE_OPS_FL_ENABLED;
-- 
2.43.0