linux-kernel - [PATCH] mm: kill find_min_pfn_with_active

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Date:   Mon, 15 Aug 2022 19:10:17 +0800
From:   Kefeng Wang <wangkefeng.wang@...wei.com>
To:     Andrew Morton <akpm@...ux-foundation.org>, <linux-mm@...ck.org>
CC:     <linux-kernel@...r.kernel.org>,
        Kefeng Wang <wangkefeng.wang@...wei.com>
Subject: [PATCH] mm: kill find_min_pfn_with_active_regions()

The find_min_pfn_with_active_regions() is only called in free_area_init(),
Move PHYS_PFN(memblock_start_of_DRAM()) into free_area_init(), and kill
find_min_pfn_with_active_regions().

Signed-off-by: Kefeng Wang <wangkefeng.wang@...wei.com>
---
 include/linux/mm.h |  1 -
 mm/page_alloc.c    | 13 +------------
 2 files changed, 1 insertion(+), 13 deletions(-)

diff --git a/include/linux/mm.h b/include/linux/mm.h
index 3bedc449c14d..59144ad0a54c 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -2488,7 +2488,6 @@ extern unsigned long absent_pages_in_range(unsigned long start_pfn,
 						unsigned long end_pfn);
 extern void get_pfn_range_for_nid(unsigned int nid,
 			unsigned long *start_pfn, unsigned long *end_pfn);
-extern unsigned long find_min_pfn_with_active_regions(void);
 
 #ifndef CONFIG_NUMA
 static inline int early_pfn_to_nid(unsigned long pfn)
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index e5486d47406e..34eda5c18fdb 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -7908,17 +7908,6 @@ unsigned long __init node_map_pfn_alignment(void)
 	return ~accl_mask + 1;
 }
 
-/**
- * find_min_pfn_with_active_regions - Find the minimum PFN registered
- *
- * Return: the minimum PFN based on information provided via
- * memblock_set_node().
- */
-unsigned long __init find_min_pfn_with_active_regions(void)
-{
-	return PHYS_PFN(memblock_start_of_DRAM());
-}
-
 /*
  * early_calculate_totalpages()
  * Sum pages in active regions for movable zone.
@@ -8211,7 +8200,7 @@ void __init free_area_init(unsigned long *max_zone_pfn)
 	memset(arch_zone_highest_possible_pfn, 0,
 				sizeof(arch_zone_highest_possible_pfn));
 
-	start_pfn = find_min_pfn_with_active_regions();
+	start_pfn = PHYS_PFN(memblock_start_of_DRAM());
 	descending = arch_has_descending_max_zone_pfns();
 
 	for (i = 0; i < MAX_NR_ZONES; i++) {
-- 
2.35.3