[PATCH] mm/hugetlb: use EOPNOTSUPP in hugetlb sysctl handlers

From: Jan Stancek <jstancek@redhat.com>
To: linux-mm@kvack.org
Cc: linux-kernel@vger.kernel.org, akpm@linux-foundation.org,
	n-horiguchi@ah.jp.nec.com, mike.kravetz@oracle.com,
	hillf.zj@alibaba-inc.com, kirill.shutemov@linux.intel.com,
	dave.hansen@linux.intel.com, paul.gortmaker@windriver.com,
	jstancek@redhat.com
Subject: [PATCH] mm/hugetlb: use EOPNOTSUPP in hugetlb sysctl handlers
Date: Thu,  3 Mar 2016 11:02:51 +0100	[thread overview]
Message-ID: <bdc32a3ce19bd1fa232852d179a6af958778c2c0.1456999026.git.jstancek@redhat.com> (raw)

Replace ENOTSUPP with EOPNOTSUPP. If hugepages are not supported,
this value is propagated to userspace. EOPNOTSUPP is part of uapi
and is widely supported by libc libraries.

Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Hillf Danton <hillf.zj@alibaba-inc.com>
Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Paul Gortmaker <paul.gortmaker@windriver.com>

Signed-off-by: Jan Stancek <jstancek@redhat.com>
---
 mm/hugetlb.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 01f2b48c8618..851a29928a99 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -2751,7 +2751,7 @@ static int hugetlb_sysctl_handler_common(bool obey_mempolicy,
 	int ret;
 
 	if (!hugepages_supported())
-		return -ENOTSUPP;
+		return -EOPNOTSUPP;
 
 	table->data = &tmp;
 	table->maxlen = sizeof(unsigned long);
@@ -2792,7 +2792,7 @@ int hugetlb_overcommit_handler(struct ctl_table *table, int write,
 	int ret;
 
 	if (!hugepages_supported())
-		return -ENOTSUPP;
+		return -EOPNOTSUPP;
 
 	tmp = h->nr_overcommit_huge_pages;
 
-- 
1.8.3.1
