linux-kernel - Re: [PATCH] mm: workingset: fix NULL ptr dereference

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Message-ID: <20180409124852.GE21835@dhcp22.suse.cz>
Date:   Mon, 9 Apr 2018 14:48:52 +0200
From:   Michal Hocko <mhocko@...nel.org>
To:     Chao Yu <yuchao0@...wei.com>
Cc:     Minchan Kim <minchan@...nel.org>,
        Matthew Wilcox <willy@...radead.org>,
        Jaegeuk Kim <jaegeuk@...nel.org>,
        Christopher Lameter <cl@...ux.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux-mm <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Johannes Weiner <hannes@...xchg.org>, Jan Kara <jack@...e.cz>,
        Chris Fries <cfries@...gle.com>,
        linux-f2fs-devel@...ts.sourceforge.net,
        linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH] mm: workingset: fix NULL ptr dereference

On Mon 09-04-18 20:25:06, Chao Yu wrote:
[...]
> diff --git a/fs/f2fs/inode.c b/fs/f2fs/inode.c
> index c85cccc2e800..cc63f8c448f0 100644
> --- a/fs/f2fs/inode.c
> +++ b/fs/f2fs/inode.c
> @@ -339,10 +339,10 @@ struct inode *f2fs_iget(struct super_block *sb, unsigned long ino)
>  make_now:
>  	if (ino == F2FS_NODE_INO(sbi)) {
>  		inode->i_mapping->a_ops = &f2fs_node_aops;
> -		mapping_set_gfp_mask(inode->i_mapping, GFP_F2FS_ZERO);
> +		mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS);

An unrelated question. Why do you make all allocations for the mapping
NOFS automatically? What kind of reclaim recursion problems are you
trying to prevent?
-- 
Michal Hocko
SUSE Labs