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

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Message-Id: <20160304133807.72ede1000b9bf0b846d2fb87@linux-foundation.org>
Date:	Fri, 4 Mar 2016 13:38:07 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Jan Stancek <jstancek@...hat.com>
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.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
Subject: Re: [PATCH] mm/hugetlb: use EOPNOTSUPP in hugetlb sysctl handlers

On Thu,  3 Mar 2016 11:02:51 +0100 Jan Stancek <jstancek@...hat.com> wrote:

> 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.

hm, what is the actual user-visible effect of this change?  Does it fix
some misbehaviour?