[PATCH] static_call: Fix unused variable warning

From: Guenter Roeck <linux@roeck-us.net>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>,
	Jason Baron <jbaron@akamai.com>,
	Steven Rostedt <rostedt@goodmis.org>,
	Ard Biesheuvel <ardb@kernel.org>,
	linux-kernel@vger.kernel.org, Guenter Roeck <linux@roeck-us.net>
Subject: [PATCH] static_call: Fix unused variable warning
Date: Wed, 21 Apr 2021 17:33:34 -0700	[thread overview]
Message-ID: <20210422003334.139452-1-linux@roeck-us.net> (raw)

If CONFIG_MODULES=n, the following build warning is reported.

kernel/static_call.c: In function ‘__static_call_update’:
kernel/static_call.c:153:18: warning: unused variable ‘mod’

Mark the variable as __maybe_unused to fix the problem.

Fixes: 9183c3f9ed71 ("static_call: Add inline static call infrastructure")
Reported-by: Zach Reizner <zachr@google.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
---
 kernel/static_call.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/static_call.c b/kernel/static_call.c
index 2c5950b0b90e..8211a34251f8 100644
--- a/kernel/static_call.c
+++ b/kernel/static_call.c
@@ -150,7 +150,7 @@ void __static_call_update(struct static_call_key *key, void *tramp, void *func)
 
 	for (site_mod = &first; site_mod; site_mod = site_mod->next) {
 		bool init = system_state < SYSTEM_RUNNING;
-		struct module *mod = site_mod->mod;
+		struct module __maybe_unused *mod = site_mod->mod;
 
 		if (!site_mod->sites) {
 			/*
-- 
2.17.1

