From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753375AbdDJLGk (ORCPT ); Mon, 10 Apr 2017 07:06:40 -0400 Received: from mail-wm0-f66.google.com ([74.125.82.66]:36264 "EHLO mail-wm0-f66.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752746AbdDJLEQ (ORCPT ); Mon, 10 Apr 2017 07:04:16 -0400 From: Michal Hocko To: linux-mm@kvack.org Cc: Andrew Morton , Mel Gorman , Vlastimil Babka , Andrea Arcangeli , Jerome Glisse , Reza Arbab , Yasuaki Ishimatsu , qiuxishi@huawei.com, Kani Toshimitsu , slaoub@gmail.com, Joonsoo Kim , Andi Kleen , David Rientjes , Daniel Kiper , Igor Mammedov , Vitaly Kuznetsov , LKML , Michal Hocko Subject: [PATCH 1/9] mm: remove return value from init_currently_empty_zone Date: Mon, 10 Apr 2017 13:03:43 +0200 Message-Id: <20170410110351.12215-2-mhocko@kernel.org> X-Mailer: git-send-email 2.11.0 In-Reply-To: <20170410110351.12215-1-mhocko@kernel.org> References: <20170410110351.12215-1-mhocko@kernel.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Michal Hocko 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 --- 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); } } -- 2.11.0