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From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
To: Wu Fengguang <fengguang.wu@intel.com>
Cc: "Zheng, Shaohui" <shaohui.zheng@intel.com>,
	"linux-mm@kvack.org" <linux-mm@kvack.org>,
	"akpm@linux-foundation.org" <akpm@linux-foundation.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"ak@linux.intel.com" <ak@linux.intel.com>,
	"y-goto@jp.fujitsu.com" <y-goto@jp.fujitsu.com>,
	Dave Hansen <haveblue@us.ibm.com>,
	"x86@kernel.org" <x86@kernel.org>
Subject: Re: [PATCH - resend] Memory-Hotplug: Fix the bug on interface /dev/mem for 64-bit kernel(v1)
Date: Tue, 12 Jan 2010 11:39:03 +0900	[thread overview]
Message-ID: <20100112113903.89163c46.kamezawa.hiroyu@jp.fujitsu.com> (raw)
In-Reply-To: <20100112023307.GA16661@localhost>

On Tue, 12 Jan 2010 10:33:08 +0800
Wu Fengguang <fengguang.wu@intel.com> wrote:

> Sure, here it is :)
> ---
> x86: use the generic page_is_ram()
> 
> The generic resource based page_is_ram() works better with memory
> hotplug/hotremove. So switch the x86 e820map based code to it.
> 
> CC: Andi Kleen <andi@firstfloor.org> 
> CC: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> 
> Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>

Ack.


> +#ifdef CONFIG_X86
> +	/*
> +	 * A special case is the first 4Kb of memory;
> +	 * This is a BIOS owned area, not kernel ram, but generally
> +	 * not listed as such in the E820 table.
> +	 */
> +	if (pfn == 0)
> +		return 0;
> +
> +	/*
> +	 * Second special case: Some BIOSen report the PC BIOS
> +	 * area (640->1Mb) as ram even though it is not.
> +	 */
> +	if (pfn >= (BIOS_BEGIN >> PAGE_SHIFT) &&
> +	    pfn <  (BIOS_END   >> PAGE_SHIFT))
> +		return 0;
> +#endif

I'm glad if this part is sorted out in clean way ;)

Thanks,
-Kame


WARNING: multiple messages have this Message-ID (diff)
From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
To: Wu Fengguang <fengguang.wu@intel.com>
Cc: "Zheng, Shaohui" <shaohui.zheng@intel.com>,
	"linux-mm@kvack.org" <linux-mm@kvack.org>,
	"akpm@linux-foundation.org" <akpm@linux-foundation.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"ak@linux.intel.com" <ak@linux.intel.com>,
	"y-goto@jp.fujitsu.com" <y-goto@jp.fujitsu.com>,
	Dave Hansen <haveblue@us.ibm.com>,
	"x86@kernel.org" <x86@kernel.org>
Subject: Re: [PATCH - resend] Memory-Hotplug: Fix the bug on interface /dev/mem for 64-bit kernel(v1)
Date: Tue, 12 Jan 2010 11:39:03 +0900	[thread overview]
Message-ID: <20100112113903.89163c46.kamezawa.hiroyu@jp.fujitsu.com> (raw)
In-Reply-To: <20100112023307.GA16661@localhost>

On Tue, 12 Jan 2010 10:33:08 +0800
Wu Fengguang <fengguang.wu@intel.com> wrote:

> Sure, here it is :)
> ---
> x86: use the generic page_is_ram()
> 
> The generic resource based page_is_ram() works better with memory
> hotplug/hotremove. So switch the x86 e820map based code to it.
> 
> CC: Andi Kleen <andi@firstfloor.org> 
> CC: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> 
> Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>

Ack.


> +#ifdef CONFIG_X86
> +	/*
> +	 * A special case is the first 4Kb of memory;
> +	 * This is a BIOS owned area, not kernel ram, but generally
> +	 * not listed as such in the E820 table.
> +	 */
> +	if (pfn == 0)
> +		return 0;
> +
> +	/*
> +	 * Second special case: Some BIOSen report the PC BIOS
> +	 * area (640->1Mb) as ram even though it is not.
> +	 */
> +	if (pfn >= (BIOS_BEGIN >> PAGE_SHIFT) &&
> +	    pfn <  (BIOS_END   >> PAGE_SHIFT))
> +		return 0;
> +#endif

I'm glad if this part is sorted out in clean way ;)

Thanks,
-Kame

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  reply	other threads:[~2010-01-12  2:42 UTC|newest]

Thread overview: 39+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-01-08  3:32 [PATCH - resend] Memory-Hotplug: Fix the bug on interface /dev/mem for 64-bit kernel(v1) Zheng, Shaohui
2010-01-08  5:02 ` H. Peter Anvin
2010-01-08  5:02   ` H. Peter Anvin
2010-01-08  5:18   ` Zheng, Shaohui
2010-01-08  5:18     ` Zheng, Shaohui
2010-01-08 19:47   ` Andi Kleen
2010-01-08 19:47     ` Andi Kleen
2010-01-12  0:58     ` KAMEZAWA Hiroyuki
2010-01-12  0:58       ` KAMEZAWA Hiroyuki
2010-01-08 12:48 ` Wu Fengguang
2010-01-08 12:48   ` Wu Fengguang
2010-01-11  2:20   ` Zheng, Shaohui
2010-01-11  2:20     ` Zheng, Shaohui
2010-01-11 12:43     ` Wu Fengguang
2010-01-11 12:43       ` Wu Fengguang
2010-01-12  0:30       ` KAMEZAWA Hiroyuki
2010-01-12  0:30         ` KAMEZAWA Hiroyuki
2010-01-12  1:38         ` Andi Kleen
2010-01-12  1:38           ` Andi Kleen
2010-01-12  1:39           ` KAMEZAWA Hiroyuki
2010-01-12  1:39             ` KAMEZAWA Hiroyuki
2010-01-12  1:50             ` KAMEZAWA Hiroyuki
2010-01-12  1:50               ` KAMEZAWA Hiroyuki
2010-01-12  2:45               ` Wu Fengguang
2010-01-12  2:45                 ` Wu Fengguang
2010-01-12  2:33         ` Wu Fengguang
2010-01-12  2:33           ` Wu Fengguang
2010-01-12  2:39           ` KAMEZAWA Hiroyuki [this message]
2010-01-12  2:39             ` KAMEZAWA Hiroyuki
2010-01-12 13:35             ` Wu Fengguang
2010-01-12 13:35               ` Wu Fengguang
2010-01-12 23:01               ` Yinghai Lu
2010-01-12 23:01                 ` Yinghai Lu
2010-01-13  2:29                 ` Wu Fengguang
2010-01-13  2:29                   ` Wu Fengguang
2010-01-12  5:45         ` Zheng, Shaohui
2010-01-12  5:45           ` Zheng, Shaohui
2010-01-12  5:51       ` Zheng, Shaohui
2010-01-12  5:51         ` Zheng, Shaohui

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