linux-kernel - [PATCH v4 5/5] mm: sparsemem: move vmemmap related to HugeTLB to CONFIG_HUGETLB_PAGE_FREE

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Message-Id: <20210926031339.40043-6-songmuchun@bytedance.com>
Date:   Sun, 26 Sep 2021 11:13:39 +0800
From:   Muchun Song <songmuchun@...edance.com>
To:     mike.kravetz@...cle.com, akpm@...ux-foundation.org,
        osalvador@...e.de, mhocko@...e.com, song.bao.hua@...ilicon.com,
        david@...hat.com, chenhuang5@...wei.com, bodeddub@...zon.com,
        corbet@....net, willy@...radead.org, 21cnbao@...il.com
Cc:     duanxiongchun@...edance.com, fam.zheng@...edance.com,
        smuchun@...il.com, zhengqi.arch@...edance.com,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, Muchun Song <songmuchun@...edance.com>
Subject: [PATCH v4 5/5] mm: sparsemem: move vmemmap related to HugeTLB to CONFIG_HUGETLB_PAGE_FREE_VMEMMAP

The vmemmap_remap_free/alloc are relevant to HugeTLB, so move those
functiongs to the scope of CONFIG_HUGETLB_PAGE_FREE_VMEMMAP.

Signed-off-by: Muchun Song <songmuchun@...edance.com>
---
 include/linux/mm.h  | 2 ++
 mm/sparse-vmemmap.c | 2 ++
 2 files changed, 4 insertions(+)

diff --git a/include/linux/mm.h b/include/linux/mm.h
index 00bb2d938df4..a706e7ffda94 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -3182,10 +3182,12 @@ static inline void print_vma_addr(char *prefix, unsigned long rip)
 }
 #endif
 
+#ifdef CONFIG_HUGETLB_PAGE_FREE_VMEMMAP
 int vmemmap_remap_free(unsigned long start, unsigned long end,
 		       unsigned long reuse);
 int vmemmap_remap_alloc(unsigned long start, unsigned long end,
 			unsigned long reuse, gfp_t gfp_mask);
+#endif
 
 void *sparse_buffer_alloc(unsigned long size);
 struct page * __populate_section_memmap(unsigned long pfn,
diff --git a/mm/sparse-vmemmap.c b/mm/sparse-vmemmap.c
index d486a7a48512..3c7dd41c3164 100644
--- a/mm/sparse-vmemmap.c
+++ b/mm/sparse-vmemmap.c
@@ -34,6 +34,7 @@
 #include <asm/pgalloc.h>
 #include <asm/tlbflush.h>
 
+#ifdef CONFIG_HUGETLB_PAGE_FREE_VMEMMAP
 /**
  * struct vmemmap_remap_walk - walk vmemmap page table
  *
@@ -423,6 +424,7 @@ int vmemmap_remap_alloc(unsigned long start, unsigned long end,
 
 	return 0;
 }
+#endif /* CONFIG_HUGETLB_PAGE_FREE_VMEMMAP */
 
 /*
  * Allocate a block of memory to be used to back the virtual memory map
-- 
2.11.0