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

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Date:	Thu,  3 Mar 2016 11:02:51 +0100
From:	Jan Stancek <jstancek@...hat.com>
To:	linux-mm@...ck.org
Cc:	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	n-horiguchi@...jp.nec.com, mike.kravetz@...cle.com,
	hillf.zj@...baba-inc.com, kirill.shutemov@...ux.intel.com,
	dave.hansen@...ux.intel.com, paul.gortmaker@...driver.com,
	jstancek@...hat.com
Subject: [PATCH] mm/hugetlb: use EOPNOTSUPP in hugetlb sysctl handlers

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@...ux-foundation.org>
Cc: Naoya Horiguchi <n-horiguchi@...jp.nec.com>
Cc: Mike Kravetz <mike.kravetz@...cle.com>
Cc: Hillf Danton <hillf.zj@...baba-inc.com>
Cc: "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Cc: Dave Hansen <dave.hansen@...ux.intel.com>
Cc: Paul Gortmaker <paul.gortmaker@...driver.com>

Signed-off-by: Jan Stancek <jstancek@...hat.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