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

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Message-ID: <20200609152439.GG1149842@linux.ibm.com>
Date:   Tue, 9 Jun 2020 18:24:39 +0300
From:   Mike Rapoport <rppt@...ux.ibm.com>
To:     Joerg Roedel <jroedel@...e.de>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Guenter Roeck <linux@...ck-us.net>,
        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

Hi Joerg,

On Tue, Jun 09, 2020 at 02:10:56PM +0200, Joerg Roedel wrote:
> Hi Mike,
> 
> On Fri, Jun 05, 2020 at 01:00:59PM +0300, Mike Rapoport wrote:
> > We already have include/asm-generic/pgalloc.h, so maybe something like
> > that patch below would fork. This is not even compile tested.
> > 
> > diff --git a/include/asm-generic/pgalloc.h b/include/asm-generic/pgalloc.h
> 
> I experimented a bit with your diff, but it turned out that moving the
> page-table allocation functions/macros to asm-generic/pgalloc.h does not
> work on all architectures.
> 
> The reason is that some archs don't use that header at all (e.g. ARC)
> and have their own version of the functions defined there. That could
> all be made working, but I decided to no open this can of worms for now.
> 
> So I sent out a patch which moves the p?d_alloc_track() functions/macros
> to a separate header and include it only in mm/vmalloc.c and
> lib/ioremap.c. 

I'm planning to open this can of worms eventually, but having
p?d_alloc_track() in a separate header wouldn't be the biggest of my
problems :)

> That compiles on all architectures where current Linus'
> master also builds (it does not for Alpha, CSky, Mips and Mips64), and
> as usual Hexagon and Unicore32 are not tested because I have no working
> compiler for those.
> 
> Regards,
> 
> 	Joerg

-- 
Sincerely yours,
Mike.