linux-kernel - [RFC PATCH 2/4] mm/hotplug: Expose is_mem_section_removable() and offline

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Message-Id: <20191210154611.10958-3-Tianyu.Lan@microsoft.com>
Date:   Tue, 10 Dec 2019 23:46:09 +0800
From:   lantianyu1986@...il.com
To:     kys@...rosoft.com, haiyangz@...rosoft.com, sthemmin@...rosoft.com,
        sashal@...nel.org, akpm@...ux-foundation.org,
        michael.h.kelley@...rosoft.com
Cc:     Tianyu Lan <Tianyu.Lan@...rosoft.com>,
        linux-hyperv@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, vkuznets@...hat.com, eric.devolder@...cle.com
Subject: [RFC PATCH 2/4] mm/hotplug: Expose is_mem_section_removable() and offline_pages()

From: Tianyu Lan <Tianyu.Lan@...rosoft.com>

Hyper-V driver adds memory hot remove function and will use
these interfaces in Hyper-V balloon driver which may be built
as a module. Expose these function.

Signed-off-by: Tianyu Lan <Tianyu.Lan@...rosoft.com>
---
 mm/memory_hotplug.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 07e5c67f48a8..4b358ebcc3d7 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -1191,6 +1191,7 @@ bool is_mem_section_removable(unsigned long start_pfn, unsigned long nr_pages)
 	/* All pageblocks in the memory block are likely to be hot-removable */
 	return true;
 }
+EXPORT_SYMBOL_GPL(is_mem_section_removable);
 
 /*
  * Confirm all pages in a range [start, end) belong to the same zone.
@@ -1612,6 +1613,7 @@ int offline_pages(unsigned long start_pfn, unsigned long nr_pages)
 {
 	return __offline_pages(start_pfn, start_pfn + nr_pages);
 }
+EXPORT_SYMBOL_GPL(offline_pages);
 
 static int check_memblock_offlined_cb(struct memory_block *mem, void *arg)
 {
-- 
2.14.5