From: YueHaibing <yuehaibing@xxxxxxxxxx> Subject: kernel/fork.c: 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] Link: http://lkml.kernel.org/r/1545965190-2381-1-git-send-email-yuehaibing@xxxxxxxxxx Signed-off-by: YueHaibing <yuehaibing@xxxxxxxxxx> Reviewed-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- --- a/kernel/fork.c~mm-mark-stack_vm_area-with-__maybe_unused +++ a/kernel/fork.c @@ -841,7 +841,7 @@ static struct task_struct *dup_task_stru { 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) _
