From: Andrew Morton <akpm@osdl.org>
Date: Fri, 23 Jun 2006 09:05:15 +0000 (-0700)
Subject: [PATCH] mmput() might sleep
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=0ae26f1b3159f3acb21ae1e866c3c7e16edd450f;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git

[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>
---

diff --git a/kernel/fork.c b/kernel/fork.c
index ac8100e3088a..195958a3a4d6 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -368,6 +368,8 @@ void fastcall __mmdrop(struct mm_struct *mm)
  */
 void mmput(struct mm_struct *mm)
 {
+	might_sleep();
+
 	if (atomic_dec_and_test(&mm->mm_users)) {
 		exit_aio(mm);
 		exit_mmap(mm);