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From: Anna-Maria Gleixner <anna-maria@linutronix.de>
Date: Thu, 18 Apr 2019 11:09:04 +0200
Subject: [PATCH 1/4] mm/page_alloc: Split drain_local_pages()
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/5.4/older/patches-5.4.13-rt7.tar.xz
Splitting the functionality of drain_local_pages() into a separate
function. This is a preparatory work for introducing the static key
dependend locking mechanism.
No functional change.
Signed-off-by: Anna-Maria Gleixner <anna-maria@linutronix.de>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
---
include/linux/gfp.h | 1 +
mm/page_alloc.c | 13 +++++++++----
2 files changed, 10 insertions(+), 4 deletions(-)
--- a/include/linux/gfp.h
+++ b/include/linux/gfp.h
@@ -580,6 +580,7 @@ extern void page_frag_free(void *addr);
void page_alloc_init(void);
void drain_zone_pages(struct zone *zone, struct per_cpu_pages *pcp);
void drain_all_pages(struct zone *zone);
+void drain_cpu_pages(unsigned int cpu, struct zone *zone);
void drain_local_pages(struct zone *zone);
void page_alloc_init_late(void);
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -2894,6 +2894,14 @@ static void drain_pages(unsigned int cpu
}
}
+void drain_cpu_pages(unsigned int cpu, struct zone *zone)
+{
+ if (zone)
+ drain_pages_zone(cpu, zone);
+ else
+ drain_pages(cpu);
+}
+
/*
* Spill all of this CPU's per-cpu pages back into the buddy allocator.
*
@@ -2904,10 +2912,7 @@ void drain_local_pages(struct zone *zone
{
int cpu = smp_processor_id();
- if (zone)
- drain_pages_zone(cpu, zone);
- else
- drain_pages(cpu);
+ drain_cpu_pages(cpu, zone);
}
static void drain_local_pages_wq(struct work_struct *work)
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