[RFCv1 5/6] misc/page_detective: enable loadable module

[Pasha Tatashin <pasha.tatashin@xxxxxxxxxx>]

Export the missing symbols, and allow page_detective to be built as
a loadable module. This can be make this available in the field, where
Page Detective is loaded only once it is needed.

Signed-off-by: Pasha Tatashin <pasha.tatashin@xxxxxxxxxx>
---
 drivers/misc/Kconfig | 2 +-
 fs/kernfs/dir.c      | 1 +
 kernel/pid.c         | 1 +
 mm/memcontrol.c      | 1 +
 mm/oom_kill.c        | 1 +
 5 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig
index 2965c3c7cdef..b58b4f9567ff 100644
--- a/drivers/misc/Kconfig
+++ b/drivers/misc/Kconfig
@@ -495,7 +495,7 @@ config MISC_RTSX
 config PAGE_DETECTIVE
 	depends on PAGE_TABLE_CHECK
 	depends on MEMCG
-	bool "Page Detective"
+	tristate "Page Detective"
 	help
 	  A debugging tool designed to provide detailed information about the
 	  usage and mapping of physical memory pages. This tool operates through
diff --git a/fs/kernfs/dir.c b/fs/kernfs/dir.c
index 458519e416fe..84ad163a4281 100644
--- a/fs/kernfs/dir.c
+++ b/fs/kernfs/dir.c
@@ -279,6 +279,7 @@ void pr_cont_kernfs_path(struct kernfs_node *kn)
 out:
 	spin_unlock_irqrestore(&kernfs_pr_cont_lock, flags);
 }
+EXPORT_SYMBOL_GPL(pr_cont_kernfs_path);
 
 /**
  * kernfs_get_parent - determine the parent node and pin it
diff --git a/kernel/pid.c b/kernel/pid.c
index 2715afb77eab..89454dc9535e 100644
--- a/kernel/pid.c
+++ b/kernel/pid.c
@@ -447,6 +447,7 @@ struct task_struct *find_get_task_by_vpid(pid_t nr)
 
 	return task;
 }
+EXPORT_SYMBOL_GPL(find_get_task_by_vpid);
 
 struct pid *get_task_pid(struct task_struct *task, enum pid_type type)
 {
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 53db98d2c4a1..389aeec06a04 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -967,6 +967,7 @@ struct mem_cgroup *get_mem_cgroup_from_folio(struct folio *folio)
 	rcu_read_unlock();
 	return memcg;
 }
+EXPORT_SYMBOL_GPL(get_mem_cgroup_from_folio);
 
 /**
  * mem_cgroup_iter - iterate over memory cgroup hierarchy
diff --git a/mm/oom_kill.c b/mm/oom_kill.c
index 4d7a0004df2c..df230a091dcc 100644
--- a/mm/oom_kill.c
+++ b/mm/oom_kill.c
@@ -149,6 +149,7 @@ struct task_struct *find_lock_task_mm(struct task_struct *p)
 
 	return t;
 }
+EXPORT_SYMBOL_GPL(find_lock_task_mm);
 
 /*
  * order == -1 means the oom kill is required by sysrq, otherwise only
-- 
2.47.0.338.g60cca15819-goog