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Date: Thu, 13 Apr 2017 15:43:36 -0400
From: YASUAKI ISHIMATSU <yasu.isimatu@...il.com>
To: Michal Hocko <mhocko@...nel.org>, linux-mm@...ck.org
Cc: Andrew Morton <akpm@...ux-foundation.org>,
Mel Gorman <mgorman@...e.de>, Vlastimil Babka <vbabka@...e.cz>,
Andrea Arcangeli <aarcange@...hat.com>,
Jerome Glisse <jglisse@...hat.com>,
Reza Arbab <arbab@...ux.vnet.ibm.com>, qiuxishi@...wei.com,
Kani Toshimitsu <toshi.kani@....com>, slaoub@...il.com,
Joonsoo Kim <js1304@...il.com>,
Andi Kleen <ak@...ux.intel.com>,
David Rientjes <rientjes@...gle.com>,
Daniel Kiper <daniel.kiper@...cle.com>,
Igor Mammedov <imammedo@...hat.com>,
Vitaly Kuznetsov <vkuznets@...hat.com>,
LKML <linux-kernel@...r.kernel.org>,
Michal Hocko <mhocko@...e.com>
Subject: Re: [PATCH 1/9] mm: remove return value from
init_currently_empty_zone
On 04/10/2017 07:03 AM, Michal Hocko wrote:
> From: Michal Hocko <mhocko@...e.com>
>
> init_currently_empty_zone doesn't have any error to return yet it is
> still an int and callers try to be defensive and try to handle potential
> error. Remove this nonsense and simplify all callers.
>
> This patch shouldn't have any visible effect
>
> Signed-off-by: Michal Hocko <mhocko@...e.com>
> ---
Reviewed-by: Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>
Thanks,
Yasuaki Ishimatsu
> include/linux/mmzone.h | 2 +-
> mm/memory_hotplug.c | 23 +++++------------------
> mm/page_alloc.c | 8 ++------
> 3 files changed, 8 insertions(+), 25 deletions(-)
>
> diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
> index ebaccd4e7d8c..0fc121bbf4ff 100644
> --- a/include/linux/mmzone.h
> +++ b/include/linux/mmzone.h
> @@ -771,7 +771,7 @@ enum memmap_context {
> MEMMAP_EARLY,
> MEMMAP_HOTPLUG,
> };
> -extern int init_currently_empty_zone(struct zone *zone, unsigned long start_pfn,
> +extern void init_currently_empty_zone(struct zone *zone, unsigned long start_pfn,
> unsigned long size);
>
> extern void lruvec_init(struct lruvec *lruvec);
> diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
> index 257166ebdff0..9ed251811ec3 100644
> --- a/mm/memory_hotplug.c
> +++ b/mm/memory_hotplug.c
> @@ -347,27 +347,20 @@ static void fix_zone_id(struct zone *zone, unsigned long start_pfn,
> set_page_links(pfn_to_page(pfn), zid, nid, pfn);
> }
>
> -/* Can fail with -ENOMEM from allocating a wait table with vmalloc() or
> - * alloc_bootmem_node_nopanic()/memblock_virt_alloc_node_nopanic() */
> -static int __ref ensure_zone_is_initialized(struct zone *zone,
> +static void __ref ensure_zone_is_initialized(struct zone *zone,
> unsigned long start_pfn, unsigned long num_pages)
> {
> if (!zone_is_initialized(zone))
> - return init_currently_empty_zone(zone, start_pfn, num_pages);
> -
> - return 0;
> + init_currently_empty_zone(zone, start_pfn, num_pages);
> }
>
> static int __meminit move_pfn_range_left(struct zone *z1, struct zone *z2,
> unsigned long start_pfn, unsigned long end_pfn)
> {
> - int ret;
> unsigned long flags;
> unsigned long z1_start_pfn;
>
> - ret = ensure_zone_is_initialized(z1, start_pfn, end_pfn - start_pfn);
> - if (ret)
> - return ret;
> + ensure_zone_is_initialized(z1, start_pfn, end_pfn - start_pfn);
>
> pgdat_resize_lock(z1->zone_pgdat, &flags);
>
> @@ -403,13 +396,10 @@ static int __meminit move_pfn_range_left(struct zone *z1, struct zone *z2,
> static int __meminit move_pfn_range_right(struct zone *z1, struct zone *z2,
> unsigned long start_pfn, unsigned long end_pfn)
> {
> - int ret;
> unsigned long flags;
> unsigned long z2_end_pfn;
>
> - ret = ensure_zone_is_initialized(z2, start_pfn, end_pfn - start_pfn);
> - if (ret)
> - return ret;
> + ensure_zone_is_initialized(z2, start_pfn, end_pfn - start_pfn);
>
> pgdat_resize_lock(z1->zone_pgdat, &flags);
>
> @@ -480,12 +470,9 @@ static int __meminit __add_zone(struct zone *zone, unsigned long phys_start_pfn)
> int nid = pgdat->node_id;
> int zone_type;
> unsigned long flags, pfn;
> - int ret;
>
> zone_type = zone - pgdat->node_zones;
> - ret = ensure_zone_is_initialized(zone, phys_start_pfn, nr_pages);
> - if (ret)
> - return ret;
> + ensure_zone_is_initialized(zone, phys_start_pfn, nr_pages);
>
> pgdat_resize_lock(zone->zone_pgdat, &flags);
> grow_zone_span(zone, phys_start_pfn, phys_start_pfn + nr_pages);
> diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> index 9c587000d408..0cacba69ab04 100644
> --- a/mm/page_alloc.c
> +++ b/mm/page_alloc.c
> @@ -5517,7 +5517,7 @@ static __meminit void zone_pcp_init(struct zone *zone)
> zone_batchsize(zone));
> }
>
> -int __meminit init_currently_empty_zone(struct zone *zone,
> +void __meminit init_currently_empty_zone(struct zone *zone,
> unsigned long zone_start_pfn,
> unsigned long size)
> {
> @@ -5535,8 +5535,6 @@ int __meminit init_currently_empty_zone(struct zone *zone,
>
> zone_init_free_lists(zone);
> zone->initialized = 1;
> -
> - return 0;
> }
>
> #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
> @@ -5999,7 +5997,6 @@ static void __paginginit free_area_init_core(struct pglist_data *pgdat)
> {
> enum zone_type j;
> int nid = pgdat->node_id;
> - int ret;
>
> pgdat_resize_init(pgdat);
> #ifdef CONFIG_NUMA_BALANCING
> @@ -6081,8 +6078,7 @@ static void __paginginit free_area_init_core(struct pglist_data *pgdat)
>
> set_pageblock_order();
> setup_usemap(pgdat, zone, zone_start_pfn, size);
> - ret = init_currently_empty_zone(zone, zone_start_pfn, size);
> - BUG_ON(ret);
> + init_currently_empty_zone(zone, zone_start_pfn, size);
> memmap_init(size, nid, j, zone_start_pfn);
> }
> }
>
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