linux-kernel - Re: [PATCH] microblaze: Fix pfn

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Date:	Mon, 16 Nov 2009 11:12:50 +0100
From:	Michal Simek <monstr@...str.eu>
To:	steve@...idescorp.com
CC:	microblaze-uclinux@...e.uq.edu.au, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] microblaze: Fix pfn_valid() for noMMU

steve@...idescorp.com wrote:
> Configuring DEBUG_SLAB causes a noMMU kernel to die during initialization
> with an invalid virtual address panic in kfree_debugcheck().
> The panic is due to an improper definition of pfn_valid().
> 
> Signed-off-by: Steven J. Magnani <steve@...idescorp.com>

Added to next branch.

Thanks,
Michal


> ---
> diff -uprN a/arch/microblaze/include/asm/page.h b/arch/microblaze/include/asm/page.h
> --- a/arch/microblaze/include/asm/page.h	2009-09-09 17:13:59.000000000 -0500
> +++ b/arch/microblaze/include/asm/page.h	2009-11-13 15:20:26.000000000 -0600
> @@ -161,7 +161,8 @@ extern int page_is_ram(unsigned long pfn
>  #  endif /* CONFIG_MMU */
>  
>  #  ifndef CONFIG_MMU
> -#  define pfn_valid(pfn)	((pfn) >= min_low_pfn && (pfn) <= max_mapnr)
> +#  define pfn_valid(pfn)	(((pfn) >= min_low_pfn) && \
> +				((pfn) <= (min_low_pfn + max_mapnr)))
>  #  define ARCH_PFN_OFFSET	(PAGE_OFFSET >> PAGE_SHIFT)
>  #  else /* CONFIG_MMU */
>  #  define ARCH_PFN_OFFSET	(memory_start >> PAGE_SHIFT)
> 


-- 
Michal Simek, Ing. (M.Eng)
w: www.monstr.eu p: +42-0-721842854
Maintainer of Linux kernel 2.6 Microblaze Linux - http://www.monstr.eu/fdt/
Microblaze U-BOOT custodian
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