linux-kernel - [PATCH] ftrace: shut up -Wcast-function-type warning for ftrace_ops_no

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Date:   Mon, 22 Mar 2021 22:49:58 +0100
From:   Arnd Bergmann <arnd@...nel.org>
To:     Steven Rostedt <rostedt@...dmis.org>,
        Ingo Molnar <mingo@...hat.com>
Cc:     Arnd Bergmann <arnd@...db.de>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Tobias Klauser <tklauser@...tanz.ch>,
        Wei Yang <richard.weiyang@...ux.alibaba.com>,
        Chengming Zhou <zhouchengming@...edance.com>,
        "Naveen N. Rao" <naveen.n.rao@...ux.vnet.ibm.com>,
        "Paul E. McKenney" <paulmck@...nel.org>,
        linux-kernel@...r.kernel.org
Subject: [PATCH] ftrace: shut up -Wcast-function-type warning for ftrace_ops_no_ops

From: Arnd Bergmann <arnd@...db.de>

With 'make W=1', gcc warns about casts between incompatible function
types:

kernel/trace/ftrace.c:128:31: error: cast between incompatible function types from 'void (*)(long unsigned int,  long unsigned int)' to 'void (*)(long unsigned int,  long unsigned int,  struct ftrace_ops *, struct ftrace_regs *)' [-Werror=cast-function-type]
  128 | #define ftrace_ops_list_func ((ftrace_func_t)ftrace_ops_no_ops)
      |                               ^

As the commet here explains, this one was intentional, so shut up the
warning harder by using a double cast.

Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 kernel/trace/ftrace.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index 4d8e35575549..d8fc87a17421 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -125,7 +125,7 @@ static void ftrace_ops_list_func(unsigned long ip, unsigned long parent_ip,
 #else
 /* See comment below, where ftrace_ops_list_func is defined */
 static void ftrace_ops_no_ops(unsigned long ip, unsigned long parent_ip);
-#define ftrace_ops_list_func ((ftrace_func_t)ftrace_ops_no_ops)
+#define ftrace_ops_list_func ((ftrace_func_t)(void *)ftrace_ops_no_ops)
 #endif
 
 static inline void ftrace_ops_init(struct ftrace_ops *ops)
-- 
2.29.2