linux-kernel - Re: [PATCH] hugetlbfs: initialize shared policy as part of inode allocation

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Date:   Sat, 25 Mar 2017 09:54:02 +0900
From:   Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
To:     mike.kravetz@...cle.com, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Cc:     dvyukov@...gle.com, mhocko@...e.com, hillf.zj@...baba-inc.com,
        dave.hansen@...ux.intel.com, akpm@...ux-foundation.org
Subject: Re: [PATCH] hugetlbfs: initialize shared policy as part of inode allocation

Mike Kravetz wrote:
> Any time after inode allocation, destroy_inode can be called.  The
> hugetlbfs inode contains a shared_policy structure, and
> mpol_free_shared_policy is unconditionally called as part of
> hugetlbfs_destroy_inode.  Initialize the policy as part of inode
> allocation so that any quick (error path) calls to destroy_inode
> will be handed an initialized policy.

I think you can as well do

-		struct hugetlbfs_inode_info *info;
-		info = HUGETLBFS_I(inode);
-		mpol_shared_policy_init(&info->policy, NULL);

in hugetlbfs_get_root().