linux-kernel - [PATCH] ftrace: Clean comments related to FTRACE_OPS_FL_PER

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Date:   Tue, 25 Oct 2022 15:39:23 +0000
From:   Zheng Yejian <zhengyejian1@...wei.com>
To:     <rostedt@...dmis.org>, <mhiramat@...nel.org>,
        <mark.rutland@....com>, <linux-kernel@...r.kernel.org>
CC:     <zhengyejian1@...wei.com>
Subject: [PATCH] ftrace: Clean comments related to FTRACE_OPS_FL_PER_CPU

Commit b3a88803ac5b ("ftrace: Kill FTRACE_OPS_FL_PER_CPU") didn't
completely remove the comments related to FTRACE_OPS_FL_PER_CPU.

Fixes: b3a88803ac5b ("ftrace: Kill FTRACE_OPS_FL_PER_CPU")
Signed-off-by: Zheng Yejian <zhengyejian1@...wei.com>
---
 kernel/trace/ftrace.c | 12 ++++--------
 1 file changed, 4 insertions(+), 8 deletions(-)

diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index fbf2543111c0..214de83458b9 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -163,7 +163,7 @@ static void ftrace_sync_ipi(void *data)
 static ftrace_func_t ftrace_ops_get_list_func(struct ftrace_ops *ops)
 {
 	/*
-	 * If this is a dynamic, RCU, or per CPU ops, or we force list func,
+	 * If this is a dynamic or RCU ops, or we force list func,
 	 * then it needs to call the list anyway.
 	 */
 	if (ops->flags & (FTRACE_OPS_FL_DYNAMIC | FTRACE_OPS_FL_RCU) ||
@@ -3030,7 +3030,7 @@ int ftrace_shutdown(struct ftrace_ops *ops, int command)
 
 	if (!command || !ftrace_enabled) {
 		/*
-		 * If these are dynamic or per_cpu ops, they still
+		 * If these are dynamic ops, they still
 		 * need their data freed. Since, function tracing is
 		 * not currently active, we can just free them
 		 * without synchronizing all CPUs.
@@ -3079,8 +3079,6 @@ int ftrace_shutdown(struct ftrace_ops *ops, int command)
 	/*
 	 * Dynamic ops may be freed, we must make sure that all
 	 * callers are done before leaving this function.
-	 * The same goes for freeing the per_cpu data of the per_cpu
-	 * ops.
 	 */
 	if (ops->flags & FTRACE_OPS_FL_DYNAMIC) {
 		/*
@@ -7528,8 +7526,6 @@ __ftrace_ops_list_func(unsigned long ip, unsigned long parent_ip,
 		/*
 		 * Check the following for each ops before calling their func:
 		 *  if RCU flag is set, then rcu_is_watching() must be true
-		 *  if PER_CPU is set, then ftrace_function_local_disable()
-		 *                          must be false
 		 *  Otherwise test if the ip matches the ops filter
 		 *
 		 * If any of the above fails then the op->func() is not executed.
@@ -7579,8 +7575,8 @@ NOKPROBE_SYMBOL(arch_ftrace_ops_list_func);
 
 /*
  * If there's only one function registered but it does not support
- * recursion, needs RCU protection and/or requires per cpu handling, then
- * this function will be called by the mcount trampoline.
+ * recursion, needs RCU protection, then this function will be called
+ * by the mcount trampoline.
  */
 static void ftrace_ops_assist_func(unsigned long ip, unsigned long parent_ip,
 				   struct ftrace_ops *op, struct ftrace_regs *fregs)
-- 
2.25.1