linux-kernel - [PATCH -next] mm: Mark 'stack_vm_area' with __maybe

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Date:   Fri, 28 Dec 2018 02:46:30 +0000
From:   YueHaibing <yuehaibing@...wei.com>
To:     Kees Cook <keescook@...omium.org>,
        Andy Lutomirski <luto@...capital.net>,
        Will Drewry <wad@...omium.org>,
        Marcos Paulo de Souza <marcos.souza.org@...il.com>,
        David Windsor <dave@...lcore.net>,
        "Roman Gushchin" <guro@...com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "Michal Hocko" <mhocko@...e.com>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        "Rik van Riel" <riel@...riel.com>
CC:     YueHaibing <yuehaibing@...wei.com>, <linux-kernel@...r.kernel.org>,
        <kernel-janitors@...r.kernel.org>
Subject: [PATCH -next] mm: Mark 'stack_vm_area' with __maybe_unused

Fixes gcc '-Wunused-but-set-variable' warning when
CONFIG_VMAP_STACK is not set:

kernel/fork.c: In function 'dup_task_struct':
kernel/fork.c:843:20: warning:
 variable 'stack_vm_area' set but not used [-Wunused-but-set-variable]

Signed-off-by: YueHaibing <yuehaibing@...wei.com>
---
 kernel/fork.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/fork.c b/kernel/fork.c
index e2a5156..b38c392 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -840,7 +840,7 @@ static struct task_struct *dup_task_struct(struct task_struct *orig, int node)
 {
 	struct task_struct *tsk;
 	unsigned long *stack;
-	struct vm_struct *stack_vm_area;
+	struct vm_struct *stack_vm_area __maybe_unused;
 	int err;
 
 	if (node == NUMA_NO_NODE)