linux-kernel - [PATCH 5.10 09/29] static_call: Fix unused variable warn w/o MODULE

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Date:   Mon,  6 Sep 2021 14:55:24 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Matthieu Baerts <matthieu.baerts@...sares.net>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>
Subject: [PATCH 5.10 09/29] static_call: Fix unused variable warn w/o MODULE

From: Matthieu Baerts <matthieu.baerts@...sares.net>

commit 7d95f22798ecea513f37b792b39fec4bcf20fec3 upstream.

Here is the warning converted as error and reported by GCC:

  kernel/static_call.c: In function ‘__static_call_update’:
  kernel/static_call.c:153:18: error: unused variable ‘mod’ [-Werror=unused-variable]
    153 |   struct module *mod = site_mod->mod;
        |                  ^~~
  cc1: all warnings being treated as errors
  make[1]: *** [scripts/Makefile.build:271: kernel/static_call.o] Error 1

This is simply because since recently, we no longer use 'mod' variable
elsewhere if MODULE is unset.

When using 'make tinyconfig' to generate the default kconfig, MODULE is
unset.

There are different ways to fix this warning. Here I tried to minimised
the number of modified lines and not add more #ifdef. We could also move
the declaration of the 'mod' variable inside the if-statement or
directly use site_mod->mod.

Fixes: 698bacefe993 ("static_call: Align static_call_is_init() patching condition")
Signed-off-by: Matthieu Baerts <matthieu.baerts@...sares.net>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Link: https://lkml.kernel.org/r/20210326105023.2058860-1-matthieu.baerts@tessares.net
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 kernel/static_call.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/kernel/static_call.c
+++ b/kernel/static_call.c
@@ -165,13 +165,13 @@ void __static_call_update(struct static_
 
 		stop = __stop_static_call_sites;
 
-#ifdef CONFIG_MODULES
 		if (mod) {
+#ifdef CONFIG_MODULES
 			stop = mod->static_call_sites +
 			       mod->num_static_call_sites;
 			init = mod->state == MODULE_STATE_COMING;
-		}
 #endif
+		}
 
 		for (site = site_mod->sites;
 		     site < stop && static_call_key(site) == key; site++) {