216 lines
6.0 KiB
Diff
216 lines
6.0 KiB
Diff
From: Ingo Molnar <mingo@elte.hu>
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Date: Fri, 3 Jul 2009 08:29:37 -0500
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Subject: mm: page_alloc: rt-friendly per-cpu pages
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Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.11/older/patches-4.11.9-rt7.tar.xz
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rt-friendly per-cpu pages: convert the irqs-off per-cpu locking
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method into a preemptible, explicit-per-cpu-locks method.
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Contains fixes from:
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Peter Zijlstra <a.p.zijlstra@chello.nl>
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Thomas Gleixner <tglx@linutronix.de>
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Signed-off-by: Ingo Molnar <mingo@elte.hu>
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Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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---
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mm/page_alloc.c | 55 +++++++++++++++++++++++++++++++++++++++----------------
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1 file changed, 39 insertions(+), 16 deletions(-)
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--- a/mm/page_alloc.c
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+++ b/mm/page_alloc.c
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@@ -62,6 +62,7 @@
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#include <linux/hugetlb.h>
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#include <linux/sched/rt.h>
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#include <linux/sched/mm.h>
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+#include <linux/locallock.h>
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#include <linux/page_owner.h>
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#include <linux/kthread.h>
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#include <linux/memcontrol.h>
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@@ -286,6 +287,18 @@ EXPORT_SYMBOL(nr_node_ids);
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EXPORT_SYMBOL(nr_online_nodes);
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#endif
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+static DEFINE_LOCAL_IRQ_LOCK(pa_lock);
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+
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+#ifdef CONFIG_PREEMPT_RT_BASE
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+# define cpu_lock_irqsave(cpu, flags) \
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+ spin_lock_irqsave(&per_cpu(pa_lock, cpu).lock, flags)
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+# define cpu_unlock_irqrestore(cpu, flags) \
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+ spin_unlock_irqrestore(&per_cpu(pa_lock, cpu).lock, flags)
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+#else
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+# define cpu_lock_irqsave(cpu, flags) local_irq_save(flags)
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+# define cpu_unlock_irqrestore(cpu, flags) local_irq_restore(flags)
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+#endif
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+
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int page_group_by_mobility_disabled __read_mostly;
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#ifdef CONFIG_DEFERRED_STRUCT_PAGE_INIT
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@@ -1258,10 +1271,10 @@ static void __free_pages_ok(struct page
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return;
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migratetype = get_pfnblock_migratetype(page, pfn);
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- local_irq_save(flags);
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+ local_lock_irqsave(pa_lock, flags);
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__count_vm_events(PGFREE, 1 << order);
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free_one_page(page_zone(page), page, pfn, order, migratetype);
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- local_irq_restore(flags);
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+ local_unlock_irqrestore(pa_lock, flags);
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}
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static void __init __free_pages_boot_core(struct page *page, unsigned int order)
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@@ -2288,14 +2301,14 @@ void drain_zone_pages(struct zone *zone,
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unsigned long flags;
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int to_drain, batch;
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- local_irq_save(flags);
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+ local_lock_irqsave(pa_lock, flags);
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batch = READ_ONCE(pcp->batch);
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to_drain = min(pcp->count, batch);
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if (to_drain > 0) {
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free_pcppages_bulk(zone, to_drain, pcp);
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pcp->count -= to_drain;
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}
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- local_irq_restore(flags);
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+ local_unlock_irqrestore(pa_lock, flags);
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}
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#endif
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@@ -2312,7 +2325,7 @@ static void drain_pages_zone(unsigned in
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struct per_cpu_pageset *pset;
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struct per_cpu_pages *pcp;
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- local_irq_save(flags);
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+ cpu_lock_irqsave(cpu, flags);
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pset = per_cpu_ptr(zone->pageset, cpu);
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pcp = &pset->pcp;
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@@ -2320,7 +2333,7 @@ static void drain_pages_zone(unsigned in
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free_pcppages_bulk(zone, pcp->count, pcp);
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pcp->count = 0;
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}
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- local_irq_restore(flags);
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+ cpu_unlock_irqrestore(cpu, flags);
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}
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/*
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@@ -2355,6 +2368,7 @@ void drain_local_pages(struct zone *zone
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drain_pages(cpu);
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}
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+#ifndef CONFIG_PREEMPT_RT_BASE
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static void drain_local_pages_wq(struct work_struct *work)
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{
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/*
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@@ -2368,6 +2382,7 @@ static void drain_local_pages_wq(struct
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drain_local_pages(NULL);
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preempt_enable();
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}
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+#endif
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/*
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* Spill all the per-cpu pages from all CPUs back into the buddy allocator.
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@@ -2438,7 +2453,14 @@ void drain_all_pages(struct zone *zone)
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else
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cpumask_clear_cpu(cpu, &cpus_with_pcps);
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}
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-
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+#ifdef CONFIG_PREEMPT_RT_BASE
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+ for_each_cpu(cpu, &cpus_with_pcps) {
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+ if (zone)
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+ drain_pages_zone(cpu, zone);
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+ else
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+ drain_pages(cpu);
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+ }
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+#else
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for_each_cpu(cpu, &cpus_with_pcps) {
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struct work_struct *work = per_cpu_ptr(&pcpu_drain, cpu);
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INIT_WORK(work, drain_local_pages_wq);
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@@ -2446,6 +2468,7 @@ void drain_all_pages(struct zone *zone)
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}
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for_each_cpu(cpu, &cpus_with_pcps)
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flush_work(per_cpu_ptr(&pcpu_drain, cpu));
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+#endif
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mutex_unlock(&pcpu_drain_mutex);
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}
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@@ -2507,7 +2530,7 @@ void free_hot_cold_page(struct page *pag
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migratetype = get_pfnblock_migratetype(page, pfn);
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set_pcppage_migratetype(page, migratetype);
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- local_irq_save(flags);
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+ local_lock_irqsave(pa_lock, flags);
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__count_vm_event(PGFREE);
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/*
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@@ -2538,7 +2561,7 @@ void free_hot_cold_page(struct page *pag
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}
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out:
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- local_irq_restore(flags);
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+ local_unlock_irqrestore(pa_lock, flags);
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}
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/*
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@@ -2695,7 +2718,7 @@ static struct page *rmqueue_pcplist(stru
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struct page *page;
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unsigned long flags;
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- local_irq_save(flags);
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+ local_lock_irqsave(pa_lock, flags);
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pcp = &this_cpu_ptr(zone->pageset)->pcp;
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list = &pcp->lists[migratetype];
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page = __rmqueue_pcplist(zone, migratetype, cold, pcp, list);
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@@ -2703,7 +2726,7 @@ static struct page *rmqueue_pcplist(stru
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__count_zid_vm_events(PGALLOC, page_zonenum(page), 1 << order);
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zone_statistics(preferred_zone, zone);
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}
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- local_irq_restore(flags);
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+ local_unlock_irqrestore(pa_lock, flags);
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return page;
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}
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@@ -2730,7 +2753,7 @@ struct page *rmqueue(struct zone *prefer
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* allocate greater than order-1 page units with __GFP_NOFAIL.
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*/
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WARN_ON_ONCE((gfp_flags & __GFP_NOFAIL) && (order > 1));
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- spin_lock_irqsave(&zone->lock, flags);
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+ local_spin_lock_irqsave(pa_lock, &zone->lock, flags);
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do {
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page = NULL;
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@@ -2750,14 +2773,14 @@ struct page *rmqueue(struct zone *prefer
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__count_zid_vm_events(PGALLOC, page_zonenum(page), 1 << order);
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zone_statistics(preferred_zone, zone);
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- local_irq_restore(flags);
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+ local_unlock_irqrestore(pa_lock, flags);
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out:
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VM_BUG_ON_PAGE(page && bad_range(zone, page), page);
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return page;
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failed:
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- local_irq_restore(flags);
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+ local_unlock_irqrestore(pa_lock, flags);
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return NULL;
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}
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@@ -7591,7 +7614,7 @@ void zone_pcp_reset(struct zone *zone)
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struct per_cpu_pageset *pset;
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/* avoid races with drain_pages() */
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- local_irq_save(flags);
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+ local_lock_irqsave(pa_lock, flags);
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if (zone->pageset != &boot_pageset) {
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for_each_online_cpu(cpu) {
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pset = per_cpu_ptr(zone->pageset, cpu);
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@@ -7600,7 +7623,7 @@ void zone_pcp_reset(struct zone *zone)
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free_percpu(zone->pageset);
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zone->pageset = &boot_pageset;
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}
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- local_irq_restore(flags);
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+ local_unlock_irqrestore(pa_lock, flags);
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}
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#ifdef CONFIG_MEMORY_HOTREMOVE
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