linux-kernel - [PATCH v2 2/2] kasan: fix memory hotplug during boot

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Message-Id: <20180522100756.18478-3-david@redhat.com>
Date:   Tue, 22 May 2018 12:07:56 +0200
From:   David Hildenbrand <david@...hat.com>
To:     linux-mm@...ck.org
Cc:     linux-kernel@...r.kernel.org, David Hildenbrand <david@...hat.com>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Alexander Potapenko <glider@...gle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        kasan-dev@...glegroups.com (open list:KASAN)
Subject: [PATCH v2 2/2] kasan: fix memory hotplug during boot

Using module_init() is wrong. E.g. ACPI adds and onlines memory before
our memory notifier gets registered.

This makes sure that ACPI memory detected during boot up will not
result in a kernel crash.

Easily reproducable with QEMU, just specify a DIMM when starting up.

Signed-off-by: David Hildenbrand <david@...hat.com>
---
 mm/kasan/kasan.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/kasan/kasan.c b/mm/kasan/kasan.c
index 53564229674b..a8b85706e2d6 100644
--- a/mm/kasan/kasan.c
+++ b/mm/kasan/kasan.c
@@ -892,5 +892,5 @@ static int __init kasan_memhotplug_init(void)
 	return 0;
 }
 
-module_init(kasan_memhotplug_init);
+core_initcall(kasan_memhotplug_init);
 #endif
-- 
2.17.0