linux-kernel - Re: [PATCH] hugetlbfs: add err code in initializing module

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Date:	Sun, 11 Mar 2012 13:25:20 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Hillf Danton <dhillf@...il.com>
cc:	LKML <linux-kernel@...r.kernel.org>,
	Al Viro <viro@...iv.linux.org.uk>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] hugetlbfs: add err code in initializing module

On Sun, 11 Mar 2012, Hillf Danton wrote:

> --- a/fs/hugetlbfs/inode.c	Sun Mar 11 12:46:38 2012
> +++ b/fs/hugetlbfs/inode.c	Sun Mar 11 12:49:28 2012
> @@ -1000,6 +1000,7 @@ static int __init init_hugetlbfs_fs(void
>  	hugetlbfs_inode_cachep = kmem_cache_create("hugetlbfs_inode_cache",
>  					sizeof(struct hugetlbfs_inode_info),
>  					0, 0, init_once);
> +	error = -ENOMEM;
>  	if (hugetlbfs_inode_cachep == NULL)
>  		goto out2;
> 

The patch looks good, however, we typically do things like

	error = -ENOMEM;
	hugetlbfs_inode_cachep = kmem_cache_create(...);
	if (!hugetlbfs_inode_cachep)
		...

instead.  Sometimes people grep to see if a call a function that can fail, 
such as kmem_cache_create(), is followed up by a check for NULL and this 
would otherwise fail.
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