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From: Linus Torvalds <torvalds@linux-foundation.org>
Date: Sat, 24 Sep 2016 15:54:17 -0700
Message-ID: <CA+55aFzOvPJbVFvssmiOHuCKG_z-FbGO8-EzVnShDCVmAc1MQQ@mail.gmail.com>
Subject: Re: [PATCH 2/2] radix-tree: Fix optimisation problem
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Sender: owner-linux-mm@kvack.org
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To: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Cc: Matthew Wilcox <mawilcox@microsoft.com>, Matthew Wilcox <mawilcox@linuxonhyperv.com>, Andrew Morton <akpm@linux-foundation.org>, Konstantin Khlebnikov <koct9i@gmail.com>, Ross Zwisler <ross.zwisler@linux.intel.com>, Linux Kernel Mailing List <linux-kernel@vger.kernel.org>, linux-mm <linux-mm@kvack.org>, linux-fsdevel <linux-fsdevel@vger.kernel.org>

On Sat, Sep 24, 2016 at 2:04 PM, Kirill A. Shutemov
<kirill.shutemov@linux.intel.com> wrote:
>
> Well, my ext4-with-huge-pages patchset[1] uses multi-order entries.
> It also converts shmem-with-huge-pages and hugetlb to them.

Ok, so that code actually has a chance of being used. I guess we'll
not remove it. But I *would* like this subtle issue to have a comment
around that odd cast/and/mask thing.

            Linus

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