From a8dda165ec34fac2b4119654330150e2c896e531 Mon Sep 17 00:00:00 2001
From: Andrey Ryabinin <aryabinin@virtuozzo.com>
Date: Fri, 26 Oct 2018 15:07:07 -0700
Subject: [PATCH] vfree: add debug might_sleep()

Add might_sleep() call to vfree() to catch potential sleep-in-atomic bugs
earlier.

[aryabinin@virtuozzo.com: drop might_sleep_if() from kvfree()]
  Link: http://lkml.kernel.org/r/7e19e4df-b1a6-29bd-9ae7-0266d50bef1d@virtuozzo.com
Link: http://lkml.kernel.org/r/20180914130512.10394-3-aryabinin@virtuozzo.com
Signed-off-by: Andrey Ryabinin <aryabinin@virtuozzo.com>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---
 mm/vmalloc.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index d00d42d6bf79f..97d4b25d03731 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -1587,6 +1587,8 @@ void vfree(const void *addr)
 
 	kmemleak_free(addr);
 
+	might_sleep_if(!in_interrupt());
+
 	if (!addr)
 		return;
 	if (unlikely(in_interrupt()))
-- 
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