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Subject[PATCH v4 1/2] mm: hugetlb_vmemmap: introduce ARCH_WANT_HUGETLB_PAGE_FREE_VMEMMAP
Date
The feature of minimizing overhead of struct page associated with each
HugeTLB page is implemented on x86_64, however, the infrastructure of
this feature is already there, we could easily enable it for other
architectures. Introduce ARCH_WANT_HUGETLB_PAGE_FREE_VMEMMAP for other
architectures to be easily enabled. Just select this config if they
want to enable this feature.

Suggested-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Muchun Song <songmuchun@bytedance.com>
---
arch/x86/Kconfig | 1 +
fs/Kconfig | 10 +++++++++-
2 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 9f5bd41bf660..e69d42528542 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -119,6 +119,7 @@ config X86
select ARCH_WANTS_DYNAMIC_TASK_STRUCT
select ARCH_WANTS_NO_INSTR
select ARCH_WANT_HUGE_PMD_SHARE
+ select ARCH_WANT_HUGETLB_PAGE_FREE_VMEMMAP if X86_64
select ARCH_WANT_LD_ORPHAN_WARN
select ARCH_WANTS_THP_SWAP if X86_64
select ARCH_HAS_PARANOID_L1D_FLUSH
diff --git a/fs/Kconfig b/fs/Kconfig
index 6c7dc1387beb..f6db2af33738 100644
--- a/fs/Kconfig
+++ b/fs/Kconfig
@@ -245,9 +245,17 @@ config HUGETLBFS
config HUGETLB_PAGE
def_bool HUGETLBFS

+#
+# Select this config option from the architecture Kconfig, if it is preferred
+# to enable the feature of minimizing overhead of struct page associated with
+# each HugeTLB page.
+#
+config ARCH_WANT_HUGETLB_PAGE_FREE_VMEMMAP
+ bool
+
config HUGETLB_PAGE_FREE_VMEMMAP
def_bool HUGETLB_PAGE
- depends on X86_64
+ depends on ARCH_WANT_HUGETLB_PAGE_FREE_VMEMMAP
depends on SPARSEMEM_VMEMMAP

config HUGETLB_PAGE_FREE_VMEMMAP_DEFAULT_ON
--
2.11.0
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