[PATCH v2] powerpc/mm: Implemented default_hugepagesz verification for powerpc

[Victor Aoqui <victora@linux.vnet.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@linux.vnet.ibm.com>
---
v2:

- Renamed default_hugepage_setup_sz function to hugetlb_default_size_setup;

- Added powerpc string to error message.

 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 e1bf5ca..3a142fe 100644
--- a/arch/powerpc/mm/hugetlbpage.c
+++ b/arch/powerpc/mm/hugetlbpage.c
@@ -780,6 +780,21 @@ static int __init hugepage_setup_sz(char *str)
 }
 __setup("hugepagesz=", hugepage_setup_sz);
 
+static int __init hugetlb_default_size_setup(char *str)
+{
+	unsigned long long size;
+
+	size = memparse(str, &str);
+
+	if (add_huge_page_size(size) != 0) {
+		hugetlb_bad_size();
+		pr_err("Invalid powerpc default huge page size specified(%llu)\n", size);
+	}
+
+	return 1;
+}
+__setup("default_hugepagesz=", hugetlb_default_size_setup);
+
 struct kmem_cache *hugepte_cache;
 static int __init hugetlbpage_init(void)
 {
-- 
1.8.3.1