fork: fix some -Wmissing-prototypes warnings

BugLink: https://bugs.launchpad.net/bugs/1855787
[ 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@zte.com.cn
Signed-off-by: Yi Wang <wang.yi59@zte.com.cn>
Acked-by: Michal Hocko <mhocko@suse.com>
Acked-by: Mike Rapoport <rppt@linux.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
Signed-off-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>

diff --git a/include/linux/sched/task.h b/include/linux/sched/task.h
index a74ec619ac5107a7a0a3d67a63385a05be256477..11b4fba82950fed36db4a735ef5cd998fac13955 100644 (file)
--- 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 73efe05e6fa14515fea3955a90c7342bcad1b123..2760ae8736ba513e46ff0fe18e618a9b5fe89d29 100644 (file)
--- a/init/main.c
+++ b/init/main.c
@@ -99,7 +99,6 @@
 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 c4c815fa1e42ee757ffbaef08b8df82850edba4f..21ce5efb3a88cdd59c76a9d1c263f91fa0b42215 100644 (file)
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -167,10 +167,6 @@ 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
 
 /*
@@ -380,7 +376,6 @@ 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