linux-kernel - Re: [PATCH 3/4] arm64: let set_memory

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Date:	Mon, 25 Jan 2016 18:34:07 -0800 (PST)
From:	David Rientjes <rientjes@...gle.com>
To:	Laura Abbott <labbott@...hat.com>
cc:	mika.penttila@...tfour.com, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, linux@....linux.org.uk,
	linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 3/4] arm64: let set_memory_xx(addr, 0) succeed.

On Mon, 25 Jan 2016, Laura Abbott wrote:

> On 01/23/2016 07:05 AM, mika.penttila@...tfour.com wrote:
> > From: Mika Penttilä <mika.penttila@...tfour.com>
> > 
> > This makes set_memory_xx() consistent with x86.
> > 
> > Signed-off-by: Mika Penttilä mika.penttila@...tfour.com
> > 
> > ---
> >   arch/arm64/mm/pageattr.c | 3 +++
> >   1 file changed, 3 insertions(+)
> > 
> > diff --git a/arch/arm64/mm/pageattr.c b/arch/arm64/mm/pageattr.c
> > index 3571c73..52220dd 100644
> > --- a/arch/arm64/mm/pageattr.c
> > +++ b/arch/arm64/mm/pageattr.c
> > @@ -51,6 +51,9 @@ static int change_memory_common(unsigned long addr, int
> > numpages,
> >   		WARN_ON_ONCE(1);
> >   	}
> > 
> > +	if (!numpages)
> > +		return 0;
> > +
> >   	if (start < MODULES_VADDR || start >= MODULES_END)
> >   		return -EINVAL;
> > 
> > 
> 
> I think this is going to conflict with Ard's patch
> lkml.kernel.org/g/<1453125665-26627-1-git-send-email-ard.biesheuvel@...aro.org>
> 
> Can you rebase on top of that?
> 

Also, I think patch 2 and 3 can be folded together since the change is the 
same to both functions.

I think the changelog should be expanded to explain that 
charge_memory_common() with numpages == 0 should be a no-op.

When both of those are done, and it's rebased as requested, feel free to 
add my:

	Acked-by: David Rientjes <rientjes@...gle.com>