linux-kernel - Re: [RFC PATCH 2/12] memory-hogplug : check memory offline in offline

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <alpine.DEB.2.00.1206262313440.32567@chino.kir.corp.google.com>
Date:	Tue, 26 Jun 2012 23:16:24 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>
cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	linuxppc-dev@...ts.ozlabs.org, linux-acpi@...r.kernel.org,
	len.brown@...el.com, benh@...nel.crashing.org, paulus@...ba.org,
	cl@...ux.com, minchan.kim@...il.com, akpm@...ux-foundation.org,
	kosaki.motohiro@...fujitsu.com, wency@...fujitsu.com
Subject: Re: [RFC PATCH 2/12] memory-hogplug : check memory offline in
 offline_pages

On Wed, 27 Jun 2012, Yasuaki Ishimatsu wrote:

> Index: linux-3.5-rc4/mm/memory_hotplug.c
> ===================================================================
> --- linux-3.5-rc4.orig/mm/memory_hotplug.c	2012-06-26 13:28:16.743211538 +0900
> +++ linux-3.5-rc4/mm/memory_hotplug.c	2012-06-26 13:48:38.264940468 +0900
> @@ -887,6 +887,11 @@ static int __ref offline_pages(unsigned
> 
>  	lock_memory_hotplug();
> 
> +	if (memory_is_offline(start_pfn, end_pfn)) {
> +		ret = 0;
> +		goto out;
> +	}
> +
>  	zone = page_zone(pfn_to_page(start_pfn));
>  	node = zone_to_nid(zone);
>  	nr_pages = end_pfn - start_pfn;

Are there additional prerequisites for this patch?  Otherwise it changes 
the return value of offline_memory() which will now call 
acpi_memory_powerdown_device() in the acpi memhotplug case when disabling.  
Is that a problem?
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/