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

Muchun Song
2021-05-18T09:21:35Z

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@bytedance.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