linux-kernel - [PATCH V8 5/8] fork: allow kernel code to call copy

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Date:   Wed,  9 Feb 2022 17:29:36 -0600
From:   Mike Christie <michael.christie@...cle.com>
To:     geert@...ux-m68k.org, hdanton@...a.com, hch@...radead.org,
        stefanha@...hat.com, jasowang@...hat.com, mst@...hat.com,
        sgarzare@...hat.com, virtualization@...ts.linux-foundation.org,
        christian.brauner@...ntu.com, axboe@...nel.dk,
        ebiederm@...ssion.com, linux-kernel@...r.kernel.org
Cc:     Mike Christie <michael.christie@...cle.com>
Subject: [PATCH V8 5/8] fork: allow kernel code to call copy_process

The next patch adds helpers like create_io_thread, but for use by the
vhost layer. There are several functions, so they are in their own file
instead of cluttering up fork.c. This patch allows that new file to
call copy_process.

Signed-off-by: Mike Christie <michael.christie@...cle.com>
---
 include/linux/sched/task.h | 2 ++
 kernel/fork.c              | 2 +-
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/include/linux/sched/task.h b/include/linux/sched/task.h
index c001d0fa1426..787e6108fd65 100644
--- a/include/linux/sched/task.h
+++ b/include/linux/sched/task.h
@@ -90,6 +90,8 @@ extern void exit_files(struct task_struct *);
 extern void exit_itimers(struct signal_struct *);
 
 extern pid_t kernel_clone(struct kernel_clone_args *kargs);
+struct task_struct *copy_process(struct pid *pid, int trace, int node,
+				 struct kernel_clone_args *args);
 struct task_struct *create_io_thread(int (*fn)(void *), void *arg, int node);
 struct task_struct *fork_idle(int);
 struct mm_struct *copy_init_mm(void);
diff --git a/kernel/fork.c b/kernel/fork.c
index 6a04860fa1ae..04eb7fc50a13 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -1905,7 +1905,7 @@ static void copy_oom_score_adj(u64 clone_flags, struct task_struct *tsk)
  * parts of the process environment (as per the clone
  * flags). The actual kick-off is left to the caller.
  */
-static __latent_entropy struct task_struct *copy_process(
+__latent_entropy struct task_struct *copy_process(
 					struct pid *pid,
 					int trace,
 					int node,
-- 
2.25.1