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

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Date:	Thu, 3 Mar 2016 23:05:57 +0000
From:	Naoya Horiguchi <n-horiguchi@...jp.nec.com>
To:	Jan Stancek <jstancek@...hat.com>
CC:	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"mike.kravetz@...cle.com" <mike.kravetz@...cle.com>,
	"hillf.zj@...baba-inc.com" <hillf.zj@...baba-inc.com>,
	"kirill.shutemov@...ux.intel.com" <kirill.shutemov@...ux.intel.com>,
	"dave.hansen@...ux.intel.com" <dave.hansen@...ux.intel.com>,
	"paul.gortmaker@...driver.com" <paul.gortmaker@...driver.com>
Subject: Re: [PATCH] mm/hugetlb: use EOPNOTSUPP in hugetlb sysctl handlers

On Thu, Mar 03, 2016 at 11:02:51AM +0100, Jan Stancek 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.
> 
> 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>

Acked-by: Naoya Horiguchi <n-horiguchi@...jp.nec.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
>