[PATCH 1/5] kernel/pid.c: remove static qualifier from pidfd_create()

[Matthew Bobrowski <repnop@google.com>]

With the idea of returning pidfds from the fanotify API, there needs
to be mechanism exposed for creating pidfds. To do this, the static
qualifier is dropped from pidfd_create() and a declaration is added to
linux/pid.h so that this function can be called from other kernel
subsystems i.e. fanotify in this case.

Signed-off-by: Matthew Bobrowski <repnop@google.com>
---
 include/linux/pid.h | 1 +
 kernel/pid.c        | 4 +++-
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/include/linux/pid.h b/include/linux/pid.h
index fa10acb8d6a4..af308e15f174 100644
--- a/include/linux/pid.h
+++ b/include/linux/pid.h
@@ -78,6 +78,7 @@ struct file;
 
 extern struct pid *pidfd_pid(const struct file *file);
 struct pid *pidfd_get_pid(unsigned int fd, unsigned int *flags);
+int pidfd_create(struct pid *pid, unsigned int flags);
 
 static inline struct pid *get_pid(struct pid *pid)
 {
diff --git a/kernel/pid.c b/kernel/pid.c
index ebdf9c60cd0b..d3cd95b8b080 100644
--- a/kernel/pid.c
+++ b/kernel/pid.c
@@ -550,10 +550,12 @@ struct pid *pidfd_get_pid(unsigned int fd, unsigned int *flags)
  * Note, that this function can only be called after the fd table has
  * been unshared to avoid leaking the pidfd to the new process.
  *
+ * This symbol should not be explicitly exported to loadable modules.
+ *
  * Return: On success, a cloexec pidfd is returned.
  *         On error, a negative errno number will be returned.
  */
-static int pidfd_create(struct pid *pid, unsigned int flags)
+int pidfd_create(struct pid *pid, unsigned int flags)
 {
 	int fd;
 
-- 
2.31.1.751.gd2f1c929bd-goog

/M