linux-kernel - Re: [PATCH v2] mm: fix alginment of VMA for memory mapped files on THP

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Message-ID: <B3F0EB2C-AC3E-4DD5-8D0D-91BC8DE9F5D0@fb.com>
Date:   Tue, 2 Aug 2022 19:36:36 +0000
From:   "Alex Zhu (Kernel)" <alexlzhu@...com>
To:     "dsterba@...e.cz" <dsterba@...e.cz>
CC:     Kernel Team <Kernel-team@...com>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        Chris Mason <clm@...com>,
        "josef@...icpanda.com" <josef@...icpanda.com>,
        "dsterba@...e.com" <dsterba@...e.com>,
        "linux-btrfs@...r.kernel.org" <linux-btrfs@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] mm: fix alginment of VMA for memory mapped files on
 THP


> Commit dbe6ec815641 ("ext2/4, xfs: call thp_get_unmapped_area() for pmd
> mappings") adds the callback for DAX, that btrfs does not support so it
> was left out.

Commit 1854bc6e2420 ("mm/readahead: Align file mappings for non-DAX”) removed the DAX requirement. 
We should now be able to call thp_get_unmapped_area() for btrfs.

I’ll send out a v3 with the subject and sign off corrected. Thanks!