linux-kernel - Re: [PATCH] mm/vmalloc: track which page-table levels were modified

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Date:   Fri, 5 Jun 2020 10:12:50 +0200
From:   Joerg Roedel <jroedel@...e.de>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Guenter Roeck <linux@...ck-us.net>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Andy Lutomirski <luto@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mm/vmalloc: track which page-table levels were modified

On Thu, Jun 04, 2020 at 10:16:07AM -0700, Linus Torvalds wrote:
> On Thu, Jun 4, 2020 at 1:35 AM Joerg Roedel <jroedel@...e.de> wrote:
> >
> > I posted the fix for this already:
> >
> >         https://lore.kernel.org/lkml/20200604074446.23944-1-joro@8bytes.org/
> 
> Ugh.
> 
> I was going to apply this directly, but as I looked at the patch I
> just found it fairly illegible.
> 
> Is there some reason why the 5level-fixup.h versions use that
> very-hard-to-follow macro, rather than the inline functions that the
> main mm.h file uses?
> 
> I'm _assuming_ it's because it gets included in some place where not
> everything is defined yet, so making it a macro means that it works
> (later on) when everything has come together..

Exactly, I had all of the p?d_alloc_track() functions as inlines first,
but that broke compilation on some obscure architectures, so I followed
the rule to make them macros when the p?d_alloc() was also a macro and
defined them close together.


	Joerg