[PATCH] mmput() might sleep

exit_aio() and exit_mmap() can sleep. But it's easy to accidentally call mmput() from inside locks. Cc: Dave Peterson <dsp@llnl.gov> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>

[PATCH] mmput() might sleep
exit_aio() and exit_mmap() can sleep. But it's easy to accidentally call mmput() from inside locks. Cc: Dave Peterson <dsp@llnl.gov> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Andrew Morton · Linus Torvalds
1 parent 32797f976d
Showing 1 changed file with 2 additions and 0 deletions Side-by-side Diff
kernel/fork.c
@@ -368,6 +368,8 @@
  */
 void mmput(struct mm_struct *mm)
 {
+	might_sleep();
+
 	if (atomic_dec_and_test(&mm->mm_users)) {
 		exit_aio(mm);
 		exit_mmap(mm);
...	...	@@ -368,6 +368,8 @@
368	368	*/
369	369	void mmput(struct mm_struct *mm)
370	370	{
	371	+ might_sleep();
	372	+
371	373	if (atomic_dec_and_test(&mm->mm_users)) {
372	374	exit_aio(mm);
373	375	exit_mmap(mm);