[PATCH] mm, page_alloc: fix the duplicate save/ressave irq

[zhongjiang <zhongjiang@huawei.com>]

From: zhong jiang <zhongjiang@huawei.com>

when commit 374ad05ab64d ("mm, page_alloc: only use per-cpu allocator for irq-safe requests")
introduced to the mainline, free_pcppages_bulk irq_save/resave to protect
the IRQ context. but drain_pages_zone fails to clear away the irq. because
preempt_disable have take effect. so it safely remove the code.

Fixes: 374ad05ab64d ("mm, page_alloc: only use per-cpu allocator for irq-safe requests")
Signed-off-by: zhong jiang <zhongjiang@huawei.com>
---
 mm/page_alloc.c | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 05c3956..7b16095 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -2294,11 +2294,9 @@ void drain_zone_pages(struct zone *zone, struct per_cpu_pages *pcp)
  */
 static void drain_pages_zone(unsigned int cpu, struct zone *zone)
 {
-	unsigned long flags;
 	struct per_cpu_pageset *pset;
 	struct per_cpu_pages *pcp;
 
-	local_irq_save(flags);
 	pset = per_cpu_ptr(zone->pageset, cpu);
 
 	pcp = &pset->pcp;
@@ -2306,7 +2304,6 @@ static void drain_pages_zone(unsigned int cpu, struct zone *zone)
 		free_pcppages_bulk(zone, pcp->count, pcp);
 		pcp->count = 0;
 	}
-	local_irq_restore(flags);
 }
 
 /*
-- 
1.8.3.1

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