linux-kernel - [PATCH RFC 1/2] drivers/base: export lock_device_hotplug/unlock_device

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Date:   Fri, 17 Aug 2018 09:59:00 +0200
From:   David Hildenbrand <david@...hat.com>
To:     linux-kernel@...r.kernel.org
Cc:     linux-mm@...ck.org, linuxppc-dev@...ts.ozlabs.org,
        linux-acpi@...r.kernel.org, devel@...uxdriverproject.org,
        linux-s390@...r.kernel.org, xen-devel@...ts.xenproject.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        Michal Hocko <mhocko@...e.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Dan Williams <dan.j.williams@...el.com>,
        Pavel Tatashin <pasha.tatashin@...cle.com>,
        Oscar Salvador <osalvador@...e.de>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Martin Schwidefsky <schwidefsky@...ibm.com>,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        David Hildenbrand <david@...hat.com>,
        "K . Y . Srinivasan" <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        "Rafael J . Wysocki" <rjw@...ysocki.net>,
        Len Brown <lenb@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        David Rientjes <rientjes@...gle.com>
Subject: [PATCH RFC 1/2] drivers/base: export lock_device_hotplug/unlock_device_hotplug

From: Vitaly Kuznetsov <vkuznets@...hat.com>

Well require to call add_memory()/add_memory_resource() with
device_hotplug_lock held, to avoid a lock inversion. Allow external modules
(e.g. hv_balloon) that make use of add_memory()/add_memory_resource() to
lock device hotplug.

Signed-off-by: Vitaly Kuznetsov <vkuznets@...hat.com>
[modify patch description]
Signed-off-by: David Hildenbrand <david@...hat.com>
---
 drivers/base/core.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/base/core.c b/drivers/base/core.c
index 04bbcd779e11..9010b9e942b5 100644
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -700,11 +700,13 @@ void lock_device_hotplug(void)
 {
 	mutex_lock(&device_hotplug_lock);
 }
+EXPORT_SYMBOL_GPL(lock_device_hotplug);
 
 void unlock_device_hotplug(void)
 {
 	mutex_unlock(&device_hotplug_lock);
 }
+EXPORT_SYMBOL_GPL(unlock_device_hotplug);
 
 int lock_device_hotplug_sysfs(void)
 {
-- 
2.17.1