linux-kernel - [PATCH] arm64: mm: hugetlb: add support for free vmemmap pages of HugeTLB

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Message-Id: <20210518091826.36937-1-songmuchun@bytedance.com>
Date:   Tue, 18 May 2021 17:18:26 +0800
From:   Muchun Song <songmuchun@...edance.com>
To:     will@...nel.org, akpm@...ux-foundation.org, david@...hat.com,
        bodeddub@...zon.com, osalvador@...e.de, mike.kravetz@...cle.com,
        rientjes@...gle.com
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, duanxiongchun@...edance.com,
        fam.zheng@...edance.com, zhengqi.arch@...edance.com,
        Muchun Song <songmuchun@...edance.com>
Subject: [PATCH] arm64: mm: hugetlb: add support for free vmemmap pages of HugeTLB

The preparation of supporting freeing vmemmap associated with each
HugeTLB page is ready, so we can support this feature for arm64.

Signed-off-by: Muchun Song <songmuchun@...edance.com>
---
 arch/arm64/mm/mmu.c | 5 +++++
 fs/Kconfig          | 2 +-
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/mm/mmu.c b/arch/arm64/mm/mmu.c
index 5d37e461c41f..967b01ce468d 100644
--- a/arch/arm64/mm/mmu.c
+++ b/arch/arm64/mm/mmu.c
@@ -23,6 +23,7 @@
 #include <linux/mm.h>
 #include <linux/vmalloc.h>
 #include <linux/set_memory.h>
+#include <linux/hugetlb.h>
 
 #include <asm/barrier.h>
 #include <asm/cputype.h>
@@ -1134,6 +1135,10 @@ int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node,
 	pmd_t *pmdp;
 
 	WARN_ON((start < VMEMMAP_START) || (end > VMEMMAP_END));
+
+	if (is_hugetlb_free_vmemmap_enabled() && !altmap)
+		return vmemmap_populate_basepages(start, end, node, altmap);
+
 	do {
 		next = pmd_addr_end(addr, end);
 
diff --git a/fs/Kconfig b/fs/Kconfig
index 6ce6fdac00a3..02c2d3bf1cb8 100644
--- a/fs/Kconfig
+++ b/fs/Kconfig
@@ -242,7 +242,7 @@ config HUGETLB_PAGE
 
 config HUGETLB_PAGE_FREE_VMEMMAP
 	def_bool HUGETLB_PAGE
-	depends on X86_64
+	depends on X86_64 || ARM64
 	depends on SPARSEMEM_VMEMMAP
 
 config MEMFD_CREATE
-- 
2.11.0