From: Richard Weinberger <richard@nod.at>
Subject: Re: vmalloc with GFP_NOFS
Date: Tue, 24 Apr 2018 21:10:08 +0200
Message-ID: <1912881.zKmfqiQKhD@blindfold>
References: <20180424162712.GL17484@dhcp22.suse.cz>
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Cc: LKML <linux-kernel@vger.kernel.org>,
        Artem Bityutskiy <dedekind1@gmail.com>,
        David Woodhouse <dwmw2@infradead.org>,
        Brian Norris <computersforpeace@gmail.com>,
        Boris Brezillon <boris.brezillon@free-electrons.com>,
        Marek Vasut <marek.vasut@gmail.com>,
        Cyrille Pitchen <cyrille.pitchen@wedev4u.fr>,
        Theodore Ts'o <tytso@mit.edu>,
        Andreas Dilger <adilger.kernel@dilger.ca>,
        Steven Whitehouse <swhiteho@redhat.com>,
        Bob Peterson <rpeterso@redhat.com>,
        Trond Myklebust <trond.myklebust@primarydata.com>,
        Anna Schumaker <anna.schumaker@netapp.com>,
        Adrian Hunter <adrian.hunter@intel.com>,
        Philippe Ombredanne <pombredanne@nexb.com>,
        Kate Stewart <kstewart@linuxfoundation.org>,
        Mikulas Patocka <mpatocka@redhat.com>,
        linux-mtd@lists.infradead.org, linux-ext4@vger.k
To: Michal Hocko <mhocko@kernel.org>
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[resending without html ...]

Am Dienstag, 24. April 2018, 18:27:12 CEST schrieb Michal Hocko:
> Hi,
> it seems that we still have few vmalloc users who perform GFP_NOFS
> allocation:
> drivers/mtd/ubi/io.c

UBI is not a big deal. We use it here like in UBIFS for debugging
when self-checks are enabled.

> fs/ext4/xattr.c
> fs/gfs2/dir.c
> fs/gfs2/quota.c
> fs/nfs/blocklayout/extent_tree.c
> fs/ubifs/debug.c
> fs/ubifs/lprops.c
> fs/ubifs/lpt_commit.c
> fs/ubifs/orphan.c

All users in UBIFS are debugging code and some error reporting.
No fast paths.
I think we can switch to prealloation + locking without much hassle.
I can prepare a patch.

Thanks,
//richard