linux-kernel - [PATCH 3/3] vfree, kvfree: Add debug might sleeps.

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Date:   Fri, 14 Sep 2018 16:05:12 +0300
From:   Andrey Ryabinin <aryabinin@...tuozzo.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Matthew Wilcox <willy@...radead.org>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org,
        Andrey Ryabinin <aryabinin@...tuozzo.com>
Subject: [PATCH 3/3] vfree, kvfree: Add debug might sleeps.

Add might_sleep() calls to vfree(), kvfree() to catch potential
sleep-in-atomic bugs earlier.

Signed-off-by: Andrey Ryabinin <aryabinin@...tuozzo.com>
---
 mm/util.c    | 2 ++
 mm/vmalloc.c | 2 ++
 2 files changed, 4 insertions(+)

diff --git a/mm/util.c b/mm/util.c
index 7f1f165f46af..929ed1795bc1 100644
--- a/mm/util.c
+++ b/mm/util.c
@@ -446,6 +446,8 @@ EXPORT_SYMBOL(kvmalloc_node);
  */
 void kvfree(const void *addr)
 {
+	might_sleep_if(!in_interrupt());
+
 	if (is_vmalloc_addr(addr))
 		vfree(addr);
 	else
diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index d00d42d6bf79..97d4b25d0373 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()))
-- 
2.16.4