From 78c997a4be7d1ed3ff4c27f23d30a0185d39bcbf Mon Sep 17 00:00:00 2001
From: "Chen, Kenneth W" <kenneth.w.chen@intel.com>
Date: Fri, 31 Mar 2006 02:30:01 -0800
Subject: [PATCH] hugetlb: don't allow free hugetlb count fall below reserved
 count

With strict page reservation, I think kernel should enforce number of free
hugetlb page don't fall below reserved count.  Currently it is possible in
the sysctl path.  Add proper check in sysctl to disallow that.

Signed-off-by: Ken Chen <kenneth.w.chen@intel.com>
Cc: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---
 mm/hugetlb.c | 1 +
 1 file changed, 1 insertion(+)

(limited to 'mm/hugetlb.c')

diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index d87885eb4acc..832f676ca038 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -334,6 +334,7 @@ static unsigned long set_max_huge_pages(unsigned long count)
 		return nr_huge_pages;
 
 	spin_lock(&hugetlb_lock);
+	count = max(count, reserved_huge_pages);
 	try_to_free_low(count);
 	while (count < nr_huge_pages) {
 		struct page *page = dequeue_huge_page(NULL, 0);
-- 
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