linux-kernel - Re: [PATCH v1] mm/memory_hotplug: MEMHP_MERGE_RESOURCE -> MHP_MERGE

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Date:   Tue, 26 Jan 2021 09:41:05 -0500
From:   "Michael S. Tsirkin" <mst@...hat.com>
To:     David Hildenbrand <david@...hat.com>
Cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        "K. Y. Srinivasan" <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        Wei Liu <wei.liu@...nel.org>, Jason Wang <jasowang@...hat.com>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Juergen Gross <jgross@...e.com>,
        Stefano Stabellini <sstabellini@...nel.org>,
        Pankaj Gupta <pankaj.gupta.linux@...il.com>,
        Michal Hocko <mhocko@...nel.org>,
        Oscar Salvador <osalvador@...e.de>,
        Anshuman Khandual <anshuman.khandual@....com>,
        Wei Yang <richard.weiyang@...ux.alibaba.com>,
        linux-hyperv@...r.kernel.org,
        virtualization@...ts.linux-foundation.org,
        xen-devel@...ts.xenproject.org
Subject: Re: [PATCH v1] mm/memory_hotplug: MEMHP_MERGE_RESOURCE ->
 MHP_MERGE_RESOURCE

On Tue, Jan 26, 2021 at 12:58:29PM +0100, David Hildenbrand wrote:
> Let's make "MEMHP_MERGE_RESOURCE" consistent with "MHP_NONE", "mhp_t" and
> "mhp_flags". As discussed recently [1], "mhp" is our internal
> acronym for memory hotplug now.
> 
> [1] https://lore.kernel.org/linux-mm/c37de2d0-28a1-4f7d-f944-cfd7d81c334d@redhat.com/
> 
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Cc: "K. Y. Srinivasan" <kys@...rosoft.com>
> Cc: Haiyang Zhang <haiyangz@...rosoft.com>
> Cc: Stephen Hemminger <sthemmin@...rosoft.com>
> Cc: Wei Liu <wei.liu@...nel.org>
> Cc: "Michael S. Tsirkin" <mst@...hat.com>
> Cc: Jason Wang <jasowang@...hat.com>
> Cc: Boris Ostrovsky <boris.ostrovsky@...cle.com>
> Cc: Juergen Gross <jgross@...e.com>
> Cc: Stefano Stabellini <sstabellini@...nel.org>
> Cc: Pankaj Gupta <pankaj.gupta.linux@...il.com>
> Cc: Michal Hocko <mhocko@...nel.org>
> Cc: Oscar Salvador <osalvador@...e.de>
> Cc: Anshuman Khandual <anshuman.khandual@....com>
> Cc: Wei Yang <richard.weiyang@...ux.alibaba.com>
> Cc: linux-hyperv@...r.kernel.org
> Cc: virtualization@...ts.linux-foundation.org
> Cc: xen-devel@...ts.xenproject.org
> Signed-off-by: David Hildenbrand <david@...hat.com>

Acked-by: Michael S. Tsirkin <mst@...hat.com>

> ---
>  drivers/hv/hv_balloon.c        | 2 +-
>  drivers/virtio/virtio_mem.c    | 2 +-
>  drivers/xen/balloon.c          | 2 +-
>  include/linux/memory_hotplug.h | 2 +-
>  mm/memory_hotplug.c            | 2 +-
>  5 files changed, 5 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/hv/hv_balloon.c b/drivers/hv/hv_balloon.c
> index 8c471823a5af..2f776d78e3c1 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), MEMHP_MERGE_RESOURCE);
> +				(HA_CHUNK << PAGE_SHIFT), MHP_MERGE_RESOURCE);
>  
>  		if (ret) {
>  			pr_err("hot_add memory failed error is %d\n", ret);
> diff --git a/drivers/virtio/virtio_mem.c b/drivers/virtio/virtio_mem.c
> index 85a272c9978e..148bea39b09a 100644
> --- a/drivers/virtio/virtio_mem.c
> +++ b/drivers/virtio/virtio_mem.c
> @@ -623,7 +623,7 @@ static int virtio_mem_add_memory(struct virtio_mem *vm, uint64_t addr,
>  	/* Memory might get onlined immediately. */
>  	atomic64_add(size, &vm->offline_size);
>  	rc = add_memory_driver_managed(vm->nid, addr, size, vm->resource_name,
> -				       MEMHP_MERGE_RESOURCE);
> +				       MHP_MERGE_RESOURCE);
>  	if (rc) {
>  		atomic64_sub(size, &vm->offline_size);
>  		dev_warn(&vm->vdev->dev, "adding memory failed: %d\n", rc);
> diff --git a/drivers/xen/balloon.c b/drivers/xen/balloon.c
> index b57b2067ecbf..671c71245a7b 100644
> --- a/drivers/xen/balloon.c
> +++ b/drivers/xen/balloon.c
> @@ -331,7 +331,7 @@ static enum bp_state reserve_additional_memory(void)
>  	mutex_unlock(&balloon_mutex);
>  	/* add_memory_resource() requires the device_hotplug lock */
>  	lock_device_hotplug();
> -	rc = add_memory_resource(nid, resource, MEMHP_MERGE_RESOURCE);
> +	rc = add_memory_resource(nid, resource, MHP_MERGE_RESOURCE);
>  	unlock_device_hotplug();
>  	mutex_lock(&balloon_mutex);
>  
> diff --git a/include/linux/memory_hotplug.h b/include/linux/memory_hotplug.h
> index 3d99de0db2dd..4b834f5d032e 100644
> --- a/include/linux/memory_hotplug.h
> +++ b/include/linux/memory_hotplug.h
> @@ -53,7 +53,7 @@ typedef int __bitwise mhp_t;
>   * with this flag set, the resource pointer must no longer be used as it
>   * might be stale, or the resource might have changed.
>   */
> -#define MEMHP_MERGE_RESOURCE	((__force mhp_t)BIT(0))
> +#define MHP_MERGE_RESOURCE	((__force mhp_t)BIT(0))
>  
>  /*
>   * Extended parameters for memory hotplug:
> diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
> index 710e469fb3a1..ae497e3ff77c 100644
> --- a/mm/memory_hotplug.c
> +++ b/mm/memory_hotplug.c
> @@ -1153,7 +1153,7 @@ int __ref add_memory_resource(int nid, struct resource *res, mhp_t mhp_flags)
>  	 * In case we're allowed to merge the resource, flag it and trigger
>  	 * merging now that adding succeeded.
>  	 */
> -	if (mhp_flags & MEMHP_MERGE_RESOURCE)
> +	if (mhp_flags & MHP_MERGE_RESOURCE)
>  		merge_system_ram_resource(res);
>  
>  	/* online pages if requested */
> -- 
> 2.29.2