linux-kernel - [PATCH v2 kernel 3/7] mm: add a function to get the max pfn

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Date:	Wed, 29 Jun 2016 18:32:16 +0800
From:	Liang Li <liang.z.li@...el.com>
To:	mst@...hat.com
Cc:	linux-kernel@...r.kernel.org,
	virtualization@...ts.linux-foundation.org, kvm@...r.kernel.org,
	qemu-devel@...gnu.org, virtio-dev@...ts.oasis-open.org,
	dgilbert@...hat.com, quintela@...hat.com,
	Liang Li <liang.z.li@...el.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Mel Gorman <mgorman@...hsingularity.net>,
	Paolo Bonzini <pbonzini@...hat.com>,
	Cornelia Huck <cornelia.huck@...ibm.com>,
	Amit Shah <amit.shah@...hat.com>
Subject: [PATCH v2 kernel 3/7] mm: add a function to get the max pfn

Expose the function to get the max pfn, so it can be used in the
virtio-balloon device driver.

Signed-off-by: Liang Li <liang.z.li@...el.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Mel Gorman <mgorman@...hsingularity.net>
Cc: Michael S. Tsirkin <mst@...hat.com>
Cc: Paolo Bonzini <pbonzini@...hat.com>
Cc: Cornelia Huck <cornelia.huck@...ibm.com>
Cc: Amit Shah <amit.shah@...hat.com>
---
 mm/page_alloc.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 6903b69..2083b40 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -4515,6 +4515,12 @@ void show_free_areas(unsigned int filter)
 	show_swap_cache_info();
 }
 
+unsigned long get_max_pfn(void)
+{
+	return max_pfn;
+}
+EXPORT_SYMBOL(get_max_pfn);
+
 static void zoneref_set_zone(struct zone *zone, struct zoneref *zoneref)
 {
 	zoneref->zone = zone;
-- 
1.8.3.1