[RFC PATCH 3/3] alloc_tag: remove /proc/allocinfo outside of mod_lock

shutdown_mem_profiling() calls remove_proc_entry() from
reserve_module_tags(), which runs under mod_lock held for write.
remove_proc_entry() waits for readers, and a reader takes mod_lock for
read in allocinfo_start():

  CPU0 (insmod)                      CPU1 (read /proc/allocinfo)
  ----------------                   ----------------------------
  reserve_module_tags()
    down_write(&mod_lock)  [held]
                                     use_pde()            [in_use++]
                                     allocinfo_start()
                                       down_read(&mod_lock)  <- blocks
    shutdown_mem_profiling()
      remove_proc_entry()
        wait for in_use == 0         <- blocks

Move remove_proc_entry() to a workqueue.

Fixes: 4835f747d3ed ("alloc_tag: support for page allocation tag compression")
Signed-off-by: Hao Ge <[email protected]>
---
 mm/alloc_tag.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/mm/alloc_tag.c b/mm/alloc_tag.c
index 7481180dadd2..b80f5a151f28 100644
--- a/mm/alloc_tag.c
+++ b/mm/alloc_tag.c
@@ -591,6 +591,13 @@ void pgalloc_tag_swap(struct folio *new, struct folio *old)
 	put_page_tag_ref(handle_new);
 }
 
+static void remove_allocinfo_file(struct work_struct *work)
+{
+	remove_proc_entry(ALLOCINFO_FILE_NAME, NULL);
+}
+
+static DECLARE_WORK(remove_allocinfo_work, remove_allocinfo_file);
+
 static void shutdown_mem_profiling(bool remove_file)
 {
 	if (mem_alloc_profiling_enabled())
@@ -600,7 +607,7 @@ static void shutdown_mem_profiling(bool remove_file)
 		return;
 
 	if (remove_file)
-		remove_proc_entry(ALLOCINFO_FILE_NAME, NULL);
+		schedule_work(&remove_allocinfo_work);
 	mem_profiling_support = false;
 }
 
-- 
2.25.1