linux-kernel - Re: [PATCH 4/4] m68knommu: Add missing initialization of max_pfn and {min,max}_low

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Message-ID: <5649C987.3050600@uclinux.org>
Date:	Mon, 16 Nov 2015 22:18:15 +1000
From:	Greg Ungerer <gerg@...inux.org>
To:	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Sam Creasey <sammy@...my.net>, linux-m68k@...ts.linux-m68k.org
Cc:	linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/4] m68knommu: Add missing initialization of max_pfn and
 {min,max}_low_pfn

Hi Geert,

On 15/11/15 21:04, Geert Uytterhoeven wrote:
> If max_pfn is not initialized, the block layer may use wrong DMA masks.
>
> Replace open-coded shifts by PFN_DOWN() while we're at it.
>
> Signed-off-by: Geert Uytterhoeven <geert@...ux-m68k.org>
> ---
> Compile-tested only.
> ---
>   arch/m68k/kernel/setup_no.c | 9 ++++++---
>   1 file changed, 6 insertions(+), 3 deletions(-)
>
> diff --git a/arch/m68k/kernel/setup_no.c b/arch/m68k/kernel/setup_no.c
> index 88c27d94a7214c95..29b44e69f0f47375 100644
> --- a/arch/m68k/kernel/setup_no.c
> +++ b/arch/m68k/kernel/setup_no.c
> @@ -238,11 +238,14 @@ void __init setup_arch(char **cmdline_p)
>   	 * Give all the memory to the bootmap allocator, tell it to put the
>   	 * boot mem_map at the start of memory.
>   	 */
> +	min_low_pfn = PFN_DOWN(memory_start);
> +	max_pfn = max_low_pfn = PFN_DOWN(memory_end);
> +
>   	bootmap_size = init_bootmem_node(
>   			NODE_DATA(0),
> -			memory_start >> PAGE_SHIFT, /* map goes here */
> -			PAGE_OFFSET >> PAGE_SHIFT,	/* 0 on coldfire */
> -			memory_end >> PAGE_SHIFT);
> +			min_low_pfn,		/* map goes here */
> +			PFN_DOWN(PAGE_OFFSET),	/* 0 on coldfire */
> +			max_pfn);
>   	/*
>   	 * Free the usable memory, we have to make sure we do not free
>   	 * the bootmem bitmap so we then reserve it after freeing it :-)

Should this be changed to use init_bootmem() as per your changes
in patch 3 ("m68k/mm: sun3 - Add missing initialization of max_pfn and 
{min,max}_low_pfn")? For the same reason?

Regards
Greg


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