linux-kernel - Re: [PATCH -V6 02/14] hugetlbfs: don't use ERR_PTR with VM

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Date:	Thu, 24 May 2012 14:17:43 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
cc:	linux-mm@...ck.org, mgorman@...e.de,
	kamezawa.hiroyu@...fujitsu.com, dhillf@...il.com,
	aarcange@...hat.com, mhocko@...e.cz, akpm@...ux-foundation.org,
	hannes@...xchg.org, linux-kernel@...r.kernel.org,
	cgroups@...r.kernel.org
Subject: Re: [PATCH -V6 02/14] hugetlbfs: don't use ERR_PTR with VM_FAULT*
 values

On Mon, 16 Apr 2012, Aneesh Kumar K.V wrote:

> From: "Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
> 
> Using VM_FAULT_* codes with ERR_PTR will require us to make sure
> VM_FAULT_* values will not exceed MAX_ERRNO value.
> 

Is it worth the extra branches?

> Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
> Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@...ux.vnet.ibm.com>
> ---
>  mm/hugetlb.c |   18 +++++++++++++-----
>  1 file changed, 13 insertions(+), 5 deletions(-)
> 
> diff --git a/mm/hugetlb.c b/mm/hugetlb.c
> index 766eb90..5a472a5 100644
> --- a/mm/hugetlb.c
> +++ b/mm/hugetlb.c
> @@ -1123,10 +1123,10 @@ static struct page *alloc_huge_page(struct vm_area_struct *vma,
>  	 */
>  	chg = vma_needs_reservation(h, vma, addr);
>  	if (chg < 0)
> -		return ERR_PTR(-VM_FAULT_OOM);
> +		return ERR_PTR(-ENOMEM);
>  	if (chg)
>  		if (hugepage_subpool_get_pages(spool, chg))
> -			return ERR_PTR(-VM_FAULT_SIGBUS);
> +			return ERR_PTR(-ENOSPC);
>  
>  	spin_lock(&hugetlb_lock);
>  	page = dequeue_huge_page_vma(h, vma, addr, avoid_reserve);
> @@ -1136,7 +1136,7 @@ static struct page *alloc_huge_page(struct vm_area_struct *vma,
>  		page = alloc_buddy_huge_page(h, NUMA_NO_NODE);
>  		if (!page) {
>  			hugepage_subpool_put_pages(spool, chg);
> -			return ERR_PTR(-VM_FAULT_SIGBUS);
> +			return ERR_PTR(-ENOSPC);
>  		}
>  	}
>  
> @@ -2486,6 +2486,7 @@ retry_avoidcopy:
>  	new_page = alloc_huge_page(vma, address, outside_reserve);
>  
>  	if (IS_ERR(new_page)) {
> +		int err = PTR_ERR(new_page);
>  		page_cache_release(old_page);
>  
>  		/*

PTR_ERR() returns long.
--
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