linux-kernel - Re: [PATCH v2] hugetlbfs: correct handling of negative input to /proc/sys/vm/nr

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Date:	Thu, 24 Feb 2011 09:16:15 +0100
From:	Anton Arapov <anton@...hat.com>
To:	Petr Holasek <pholasek@...hat.com>
Cc:	linux-kernel@...r.kernel.org, Andi Kleen <ak@...ux.intel.com>,
	Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
	Mel Gorman <mel@....ul.ie>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Wu Fengguang <fengguang.wu@...el.com>, linux-mm@...ck.org
Subject: Re: [PATCH v2] hugetlbfs: correct handling of negative input to
 /proc/sys/vm/nr_hugepages

On Tue, Feb 22, 2011 at 09:17:04PM +0100, Petr Holasek wrote:
> When user insert negative value into /proc/sys/vm/nr_hugepages it
> will result
> in the setting a random number of HugePages in system (can be easily showed
> at /proc/meminfo output). This patch fixes the wrong behavior so that the
> negative input will result in nr_hugepages value unchanged.
> 
> v2: same fix was also done in hugetlb_overcommit_handler function
>     as suggested by reviewers.
> 
> Signed-off-by: Petr Holasek <pholasek@...hat.com>
> Reviewed-by: Naoya Horiguchi <n-horiguchi@...jp.nec.com>
> ---
>  mm/hugetlb.c |    6 ++----
>  1 files changed, 2 insertions(+), 4 deletions(-)
> 
> diff --git a/mm/hugetlb.c b/mm/hugetlb.c
> index bb0b7c1..06de5aa 100644
> --- a/mm/hugetlb.c
> +++ b/mm/hugetlb.c
> @@ -1872,8 +1872,7 @@ static int hugetlb_sysctl_handler_common(bool
> obey_mempolicy,
>      unsigned long tmp;
>      int ret;
> 
> -    if (!write)
> -        tmp = h->max_huge_pages;
> +    tmp = h->max_huge_pages;
> 
>      if (write && h->order >= MAX_ORDER)
>          return -EINVAL;
> @@ -1938,8 +1937,7 @@ int hugetlb_overcommit_handler(struct
> ctl_table *table, int write,
>      unsigned long tmp;
>      int ret;
> 
> -    if (!write)
> -        tmp = h->nr_overcommit_huge_pages;
> +    tmp = h->nr_overcommit_huge_pages;
> 
>      if (write && h->order >= MAX_ORDER)
>          return -EINVAL;
> -- 
> 1.7.1
> --
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> 
 
Signed-off-by: Anton Arapov <anton@...hat.com>

-- 
Anton
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