[PATCH] powerpc/mm: Implemented default_hugepagesz verification for powerpc

[Victor Aoqui <victora@br.ibm.com>]

Implemented default hugepage size verification (default_hugepagesz=)
in order to allow allocation of defined number of pages (hugepages=)
only for supported hugepage sizes.

Signed-off-by: Victor Aoqui <victora@br.ibm.com>
---
 arch/powerpc/mm/hugetlbpage.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/arch/powerpc/mm/hugetlbpage.c b/arch/powerpc/mm/hugetlbpage.c
index a4f33de..464e72e 100644
--- a/arch/powerpc/mm/hugetlbpage.c
+++ b/arch/powerpc/mm/hugetlbpage.c
@@ -797,6 +797,21 @@ static int __init hugepage_setup_sz(char *str)
 }
 __setup("hugepagesz=", hugepage_setup_sz);
 
+static int __init default_hugepage_setup_sz(char *str)
+{
+        unsigned long long size;
+
+        size = memparse(str, &str);
+
+        if (add_huge_page_size(size) != 0) {
+                hugetlb_bad_size();
+                pr_err("Invalid default huge page size specified(%llu)\n", size);
+        }
+
+        return 1;
+}
+__setup("default_hugepagesz=", default_hugepage_setup_sz);
+
 struct kmem_cache *hugepte_cache;
 static int __init hugetlbpage_init(void)
 {
-- 
1.8.3.1