[PATCH AUTOSEL 4.14 095/127] fork: fix some -Wmissing-prototypes warnings

From: Sasha Levin
Date: Fri Nov 22 2019 - 00:57:47 EST


From: Yi Wang <wang.yi59@xxxxxxxxxx>

[ Upstream commit fb5bf31722d0805a3f394f7d59f2e8cd07acccb7 ]

We get a warning when building kernel with W=1:

kernel/fork.c:167:13: warning: no previous prototype for `arch_release_thread_stack' [-Wmissing-prototypes]
kernel/fork.c:779:13: warning: no previous prototype for `fork_init' [-Wmissing-prototypes]

Add the missing declaration in head file to fix this.

Also, remove arch_release_thread_stack() completely because no arch
seems to implement it since bb9d81264 (arch: remove tile port).

Link: http://lkml.kernel.org/r/1542170087-23645-1-git-send-email-wang.yi59@xxxxxxxxxx
Signed-off-by: Yi Wang <wang.yi59@xxxxxxxxxx>
Acked-by: Michal Hocko <mhocko@xxxxxxxx>
Acked-by: Mike Rapoport <rppt@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
include/linux/sched/task.h | 2 ++
init/main.c | 1 -
kernel/fork.c | 5 -----
3 files changed, 2 insertions(+), 6 deletions(-)

diff --git a/include/linux/sched/task.h b/include/linux/sched/task.h
index a74ec619ac510..11b4fba82950f 100644
--- a/include/linux/sched/task.h
+++ b/include/linux/sched/task.h
@@ -39,6 +39,8 @@ void __noreturn do_task_dead(void);

extern void proc_caches_init(void);

+extern void fork_init(void);
+
extern void release_task(struct task_struct * p);

#ifdef CONFIG_HAVE_COPY_THREAD_TLS
diff --git a/init/main.c b/init/main.c
index 51067e2db509d..b1ab36fe1a55c 100644
--- a/init/main.c
+++ b/init/main.c
@@ -98,7 +98,6 @@
static int kernel_init(void *);

extern void init_IRQ(void);
-extern void fork_init(void);
extern void radix_tree_init(void);

/*
diff --git a/kernel/fork.c b/kernel/fork.c
index 3352fdbd5e20d..3d9d6a28e21d9 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -162,10 +162,6 @@ static inline void free_task_struct(struct task_struct *tsk)
}
#endif

-void __weak arch_release_thread_stack(unsigned long *stack)
-{
-}
-
#ifndef CONFIG_ARCH_THREAD_STACK_ALLOCATOR

/*
@@ -348,7 +344,6 @@ static void release_task_stack(struct task_struct *tsk)
return; /* Better to leak the stack than to free prematurely */

account_kernel_stack(tsk, -1);
- arch_release_thread_stack(tsk->stack);
free_thread_stack(tsk);
tsk->stack = NULL;
#ifdef CONFIG_VMAP_STACK
--
2.20.1