linux-kernel - Re: [PATCH 15/14] arm: Rename PMD_ORDER to PMD

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Date:   Sun, 3 Jul 2022 22:54:49 +0100
From:   Matthew Wilcox <willy@...radead.org>
To:     "Russell King (Oracle)" <linux@...linux.org.uk>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Arnd Bergmann <arnd@...db.de>, Mike Rapoport <rppt@...nel.org>,
        linux-arm-kernel@...ts.infradead.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 15/14] arm: Rename PMD_ORDER to PMD_BITS

On Sun, Jul 03, 2022 at 10:16:45PM +0100, Russell King (Oracle) wrote:
> On Sun, Jul 03, 2022 at 10:14:41PM +0100, Matthew Wilcox (Oracle) wrote:
> > This is the number of bits used by a PMD entry, not the order of a PMD.
> 
> No, it's not the number of bits. A PMD entry doesn't fit in 2 or 3 bits.
> This is even more confusing.

Well, what is it then?  The order of something is PAGE_SIZE << n, and
that doesn't seem to be what this is.  Happy to call it whatever you
want to call it.