linux-kernel - Re: [PATCH 2.6.21] cramfs: add cramfs Linear XIP

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Message-ID: <6934efce0706061201o13709f3fu4aa12e6a40fe7e06@mail.gmail.com>
Date:	Wed, 6 Jun 2007 12:01:19 -0700
From:	"Jared Hulbert" <jaredeh@...il.com>
To:	carsteno@...ibm.com
Cc:	"Nick Piggin" <nickpiggin@...oo.com.au>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	richard.griffiths@...driver.com,
	"Richard Griffiths" <res07ml0@...izon.net>,
	Linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2.6.21] cramfs: add cramfs Linear XIP

On 6/6/07, Carsten Otte <cotte@...ibm.com> wrote:
> Jared Hulbert wrote:
> > (2) failed with the following messages.  (This wasn't really busybox.
> > It was xxd, not statically link, hence the issue with ld.so)
> Could you try to figure what happend to subject page before? Was it
> subject to copy on write? With what flags has this vma been mmaped?
>
> thanks,
> Carsten

The vma->flags = 1875 = 0x753

This is:
VM_READ
VM_WRITE
VM_MAYREAD
VM_MAYEXEC
VM_GROWSDOWN
VM_GROWSUP
VM_PFNMAP

I assume no struct page exists for the pages of this file.  When
vm_no_page was called it seems it failed on a pte check since there is
no backing page structure.
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