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

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Message-ID: <1381493921.8305.63.camel@deneb.redhat.com>
Date:	Fri, 11 Oct 2013 08:18:41 -0400
From:	Mark Salter <msalter@...hat.com>
To:	Will Deacon <will.deacon@....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 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


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