linux-kernel - [PATCH 1/3] mm: make memmap

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Date:   Tue, 24 Jul 2018 19:55:18 -0400
From:   Pavel Tatashin <pasha.tatashin@...cle.com>
To:     steven.sistare@...cle.com, daniel.m.jordan@...cle.com,
        linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
        kirill.shutemov@...ux.intel.com, mhocko@...e.com,
        linux-mm@...ck.org, dan.j.williams@...el.com, jack@...e.cz,
        jglisse@...hat.com, jrdr.linux@...il.com, bhe@...hat.com,
        gregkh@...uxfoundation.org, vbabka@...e.cz,
        richard.weiyang@...il.com, dave.hansen@...el.com,
        rientjes@...gle.com, mingo@...nel.org,
        osalvador@...hadventures.net, pasha.tatashin@...cle.com,
        abdhalee@...ux.vnet.ibm.com, mpe@...erman.id.au
Subject: [PATCH 1/3] mm: make memmap_init a proper function

memmap_init is sometimes a macro sometimes a function based on
__HAVE_ARCH_MEMMAP_INIT. It is only a function on ia64. Make
memmap_init a weak function instead, and let ia64 redefine it.

Signed-off-by: Pavel Tatashin <pasha.tatashin@...cle.com>
---
 arch/ia64/include/asm/pgtable.h | 1 -
 mm/page_alloc.c                 | 9 +++++----
 2 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/arch/ia64/include/asm/pgtable.h b/arch/ia64/include/asm/pgtable.h
index 165827774bea..b1e7468eb65a 100644
--- a/arch/ia64/include/asm/pgtable.h
+++ b/arch/ia64/include/asm/pgtable.h
@@ -544,7 +544,6 @@ extern struct page *zero_page_memmap_ptr;
 
 #  ifdef CONFIG_VIRTUAL_MEM_MAP
   /* arch mem_map init routine is needed due to holes in a virtual mem_map */
-#   define __HAVE_ARCH_MEMMAP_INIT
     extern void memmap_init (unsigned long size, int nid, unsigned long zone,
 			     unsigned long start_pfn);
 #  endif /* CONFIG_VIRTUAL_MEM_MAP */
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index a790ef4be74e..cea749b26394 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -5554,10 +5554,11 @@ static void __meminit zone_init_free_lists(struct zone *zone)
 	}
 }
 
-#ifndef __HAVE_ARCH_MEMMAP_INIT
-#define memmap_init(size, nid, zone, start_pfn) \
-	memmap_init_zone((size), (nid), (zone), (start_pfn), MEMMAP_EARLY, NULL)
-#endif
+void __meminit __weak memmap_init(unsigned long size, int nid,
+				  unsigned long zone, unsigned long start_pfn)
+{
+	memmap_init_zone(size, nid, zone, start_pfn, MEMMAP_EARLY, NULL);
+}
 
 static int zone_batchsize(struct zone *zone)
 {
-- 
2.18.0