linux-kernel - Re: [PATCH 2/2] radix-tree: Fix optimisation problem

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Date:   Sat, 24 Sep 2016 15:54:17 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Cc:     Matthew Wilcox <mawilcox@...rosoft.com>,
        Matthew Wilcox <mawilcox@...uxonhyperv.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Konstantin Khlebnikov <koct9i@...il.com>,
        Ross Zwisler <ross.zwisler@...ux.intel.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-mm <linux-mm@...ck.org>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>
Subject: Re: [PATCH 2/2] radix-tree: Fix optimisation problem

On Sat, Sep 24, 2016 at 2:04 PM, Kirill A. Shutemov
<kirill.shutemov@...ux.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