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

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Date:	Wed, 23 May 2007 09:21:32 +0100
From:	Alistair John Strachan <s0348365@....ed.ac.uk>
To:	richard.griffiths@...driver.com
Cc:	Linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2.6.21] cramfs: add cramfs Linear XIP

On Tuesday 22 May 2007 23:09:39 Richard Griffiths wrote:
> Venerable cramfs fs Linear XIP patch originally from MontaVista, used in
> the embedded Linux community for years, updated for 2.6.21. Tested on
> several systems with NOR Flash. PXA270, TI OMAP2430, ARM Versatile and
> Freescale iMX31ADS.

> +#else /* CONFIG_CRAMFS_LINEAR */
> +        /*
> +         * The physical location of the cramfs image is specified as
> +         * a mount parameter.  This parameter is mandatory for obvious

You've used spaces here instead of tabs, probably worth replacing.

> +/*
> + * We hold the mm semaphore for reading and vma->vm_mm->page_table_lock
> + */
> +static inline void break_cow(struct vm_area_struct * vma, struct page * 
new_page, unsigned long address,
> +                pte_t *page_table)
> +{
> +        pte_t entry;

Here again.

> +                        /*
> +                         * Handle COW of XIP memory.
> +                         * Note that the source memory actually isn't a ram
> +                         * page so no struct page is associated to the 
source
> +                         * pte.
> +                         */

This whole section too.

-- 
Cheers,
Alistair.

Final year Computer Science undergraduate.
1F2 55 South Clerk Street, Edinburgh, UK.
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