linux-kernel - Re: [PATCH] arm64: add PAGE_ALIGNED

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Message-ID: <20131101161752.GB2442@mudshark.cambridge.arm.com>
Date:	Fri, 1 Nov 2013 16:17:53 +0000
From:	Will Deacon <will.deacon@....com>
To:	Mark Salter <msalter@...hat.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Catalin Marinas <Catalin.Marinas@....com>
Subject: Re: [PATCH] arm64: add PAGE_ALIGNED_DATA to linker script

On Fri, Nov 01, 2013 at 03:01:30PM +0000, Mark Salter wrote:
> On Fri, 2013-10-11 at 08:18 -0400, Mark Salter wrote:
> > On Wed, 2013-10-09 at 11:14 +0100, Will Deacon wrote:
> > > > @@ -110,6 +110,7 @@ SECTIONS
> > > >                */
> > > >               INIT_TASK_DATA(THREAD_SIZE)
> > > >               NOSAVE_DATA
> > > > +             PAGE_ALIGNED_DATA(PAGE_SIZE)
> > > >               CACHELINE_ALIGNED_DATA(64)
> > > >               READ_MOSTLY_DATA(64)
> > > 
> > > Can we just replace this chunk with RW_DATA_SECTION(64, PAGE_SIZE,
> > > THREAD_SIZE) instead?
> > > 
> > 
> > I took a look at this. It can be done, but the RW_DATA_SECTION aligns
> > data to PAGE_SIZE where the existing alignment is THREAD_SIZE. So using
> > RW_DATA_SECTION would waste some space if using 64K pagesize.
> > 
> > --Mark
> 
> So where do we stand with this one?

I'd probably go for using the generic macro, but I don't have strong
preferences either way.

Will
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