Subject: Re: KVA pitfall in initarm()
To: Toru Nishimura <firstname.lastname@example.org>
From: Richard Earnshaw <email@example.com>
Date: 01/05/2005 10:22:31
On Wed, 2005-01-05 at 02:15, Toru Nishimura wrote:
> Richard Earnshaw firstname.lastname@example.org commented;
> > There certainly is an assumption that the pages of the kernel text and
> > data have a 1:1 correspondence between the image loaded at boot and the
> > pages after mapping.
> ldscript.evbarm has the following lines. It can certainly be called as a bug.
> /* Adjust the address for the data segment to start on the next page
> boundary. */
> . = ALIGN(0x8000);
> .data :
> - comment says wrong.
> - 16KB data segment base alignment bogs down a machine when new TLB layout
> gets active.
Hmm, that looks excessive. Pages are 4k, so I think that should be
. = ALIGN (0x1000);
So I suspect the comment is right, but the code is wrong.