linux-kernel - Re: [PATCH v1 1/3] mm/memory_hotplug: Prepare passing flags to add

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Message-ID: <20200429164154.ctflq4ouwrwwe4wq@liuwe-devbox-debian-v2.j3c5onc20sse1dnehy4noqpfcg.zx.internal.cloudapp.net>
Date:   Wed, 29 Apr 2020 16:41:55 +0000
From:   Wei Liu <wei.liu@...nel.org>
To:     David Hildenbrand <david@...hat.com>
Cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        virtio-dev@...ts.oasis-open.org,
        virtualization@...ts.linux-foundation.org,
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        Michal Hocko <mhocko@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "Michael S . Tsirkin" <mst@...hat.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Len Brown <lenb@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Dan Williams <dan.j.williams@...el.com>,
        Vishal Verma <vishal.l.verma@...el.com>,
        Dave Jiang <dave.jiang@...el.com>,
        "K. Y. Srinivasan" <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        Wei Liu <wei.liu@...nel.org>,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ibm.com>,
        Jason Wang <jasowang@...hat.com>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Juergen Gross <jgross@...e.com>,
        Stefano Stabellini <sstabellini@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Pingfan Liu <kernelfans@...il.com>,
        Leonardo Bras <leobras.c@...il.com>,
        Nathan Lynch <nathanl@...ux.ibm.com>,
        Oscar Salvador <osalvador@...e.de>,
        Michal Hocko <mhocko@...e.com>, Baoquan He <bhe@...hat.com>,
        Wei Yang <richard.weiyang@...il.com>,
        Pankaj Gupta <pankaj.gupta.linux@...il.com>,
        Eric Biederman <ebiederm@...ssion.com>
Subject: Re: [PATCH v1 1/3] mm/memory_hotplug: Prepare passing flags to
 add_memory() and friends

On Wed, Apr 29, 2020 at 06:08:01PM +0200, David Hildenbrand wrote:
> We soon want to pass flags - prepare for that.
> 
> This patch is based on a similar patch by Oscar Salvador:
> 
> https://lkml.kernel.org/r/20190625075227.15193-3-osalvador@suse.de
> 
[...]
> ---
>  drivers/hv/hv_balloon.c                         |  2 +-

> diff --git a/drivers/hv/hv_balloon.c b/drivers/hv/hv_balloon.c
> index 32e3bc0aa665..0194bed1a573 100644
> --- a/drivers/hv/hv_balloon.c
> +++ b/drivers/hv/hv_balloon.c
> @@ -726,7 +726,7 @@ static void hv_mem_hot_add(unsigned long start, unsigned long size,
>  
>  		nid = memory_add_physaddr_to_nid(PFN_PHYS(start_pfn));
>  		ret = add_memory(nid, PFN_PHYS((start_pfn)),
> -				(HA_CHUNK << PAGE_SHIFT));
> +				(HA_CHUNK << PAGE_SHIFT), 0);
>  
>  		if (ret) {
>  			pr_err("hot_add memory failed error is %d\n", ret);

Acked-by: Wei Liu <wei.liu@...nel.org>