linux-kernel - Re: [patch]x86: arch_add

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Message-ID: <86802c440810082304j3274555etb7eca011f7459253@mail.gmail.com>
Date:	Wed, 8 Oct 2008 23:04:33 -0700
From:	"Yinghai Lu" <yinghai@...nel.org>
To:	"Shaohua Li" <shaohua.li@...el.com>
Cc:	lkml <linux-kernel@...r.kernel.org>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	"Ingo Molnar" <mingo@...hat.com>
Subject: Re: [patch]x86: arch_add_memory round up address

On Wed, Oct 8, 2008 at 10:31 PM, Shaohua Li <shaohua.li@...el.com> wrote:
> Round up address to a page, otherwise the last page isn't mapped.
>
> Signed-off-by: Shaohua Li <shaohua.li@...el.com>
> ---
>  arch/x86/mm/init_64.c |    3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
>
> Index: linux/arch/x86/mm/init_64.c
> ===================================================================
> --- linux.orig/arch/x86/mm/init_64.c    2008-10-09 11:42:33.000000000 +0800
> +++ linux/arch/x86/mm/init_64.c 2008-10-09 11:43:22.000000000 +0800
> @@ -721,7 +721,8 @@ int arch_add_memory(int nid, u64 start,
>        unsigned long nr_pages = size >> PAGE_SHIFT;
>        int ret;
>
> -       last_mapped_pfn = init_memory_mapping(start, start + size-1);
> +       last_mapped_pfn = init_memory_mapping(start,
> +               round_up(start + size-1, PAGE_SIZE));
>        if (last_mapped_pfn > max_pfn_mapped)
>                max_pfn_mapped = last_mapped_pfn;

should use

last_mapped_pfn = init_memory_mapping(start, start + size);

YH
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