diff --git a/include/linux/mm.h b/include/linux/mm.h index 3955bedeeed1c3c21cd2e573410d7e70fa3b03a4..7c6dfd2faa696839b775d072365e84d800cc01c6 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -1331,6 +1331,7 @@ void warn_alloc_failed(gfp_t gfp_mask, int order, const char *fmt, ...); extern void setup_per_cpu_pageset(void); extern void zone_pcp_update(struct zone *zone); +extern void zone_pcp_reset(struct zone *zone); /* nommu.c */ extern atomic_long_t mmap_pages_allocated; diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c index 597d371329d390267e1ad194e7979bc79466cf0b..3ad25f9d1fc134dc09e9672fad40f508e12e9502 100644 --- a/mm/memory_hotplug.c +++ b/mm/memory_hotplug.c @@ -966,6 +966,9 @@ static int __ref offline_pages(unsigned long start_pfn, init_per_zone_wmark_min(); + if (!populated_zone(zone)) + zone_pcp_reset(zone); + if (!node_present_pages(node)) { node_clear_state(node, N_HIGH_MEMORY); kswapd_stop(node); diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 9ad6866ac49c0425d815ddb747a04cbece93506c..9c9a31665a78e3301fd5de4756a2172f424fd7da 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -5894,6 +5894,19 @@ void free_contig_range(unsigned long pfn, unsigned nr_pages) #endif #ifdef CONFIG_MEMORY_HOTREMOVE +void zone_pcp_reset(struct zone *zone) +{ + unsigned long flags; + + /* avoid races with drain_pages() */ + local_irq_save(flags); + if (zone->pageset != &boot_pageset) { + free_percpu(zone->pageset); + zone->pageset = &boot_pageset; + } + local_irq_restore(flags); +} + /* * All pages in the range must be isolated before calling this. */