linux-kernel - [PATCH v2] powerpc/mm: Implemented default

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Message-Id: <20170720165838.3549-1-victora@linux.vnet.ibm.com>
Date:   Thu, 20 Jul 2017 13:58:38 -0300
From:   Victor Aoqui <victora@...ux.vnet.ibm.com>
To:     linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        aneesh.kumar@...ux.vnet.ibm.com, mpe@...erman.id.au,
        khandual@...ux.vnet.ibm.com
Cc:     victora@...ibm.com, victora@...ux.vnet.ibm.com
Subject: [PATCH v2] powerpc/mm: Implemented default_hugepagesz verification for powerpc

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@...ux.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