+ loongarch-enable-arch_want_hugetlb_page_optimize_vmemmap.patch added to mm-unstable branch

+ loongarch-enable-arch_want_hugetlb_page_optimize_vmemmap.patch added to mm-unstable branch

[Andrew Morton]

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The patch titled
     Subject: LoongArch: enable ARCH_WANT_HUGETLB_PAGE_OPTIMIZE_VMEMMAP
has been added to the -mm mm-unstable branch.  Its filename is
     loongarch-enable-arch_want_hugetlb_page_optimize_vmemmap.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/loongarch-enable-arch_want_hugetlb_page_optimize_vmemmap.patch

This patch will later appear in the mm-unstable branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

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------------------------------------------------------
From: Feiyang Chen <chenfeiyang@loongson.cn>
Subject: LoongArch: enable ARCH_WANT_HUGETLB_PAGE_OPTIMIZE_VMEMMAP
Date: Thu, 27 Oct 2022 20:52:53 +0800

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, so just select ARCH_WANT_HUGETLB_PAGE_
OPTIMIZE_VMEMMAP is enough to enable this feature for LoongArch.

Link: https://lkml.kernel.org/r/20221027125253.3458989-5-chenhuacai@loongson.cn
Signed-off-by: Feiyang Chen <chenfeiyang@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Acked-by: Muchun Song <songmuchun@bytedance.com>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Dinh Nguyen <dinguyen@kernel.org>
Cc: Guo Ren <guoren@kernel.org>
Cc: Jiaxun Yang <jiaxun.yang@flygoat.com>
Cc: Min Zhou <zhoumin@loongson.cn>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Cc: Will Deacon <will@kernel.org>
Cc: Xuefeng Li <lixuefeng@loongson.cn>
Cc: Xuerui Wang <kernel@xen0n.name>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 arch/loongarch/Kconfig |    1 +
 1 file changed, 1 insertion(+)

--- a/arch/loongarch/Kconfig~loongarch-enable-arch_want_hugetlb_page_optimize_vmemmap
+++ a/arch/loongarch/Kconfig
@@ -52,6 +52,7 @@ config LOONGARCH
 	select ARCH_USE_QUEUED_RWLOCKS
 	select ARCH_USE_QUEUED_SPINLOCKS
 	select ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT
+	select ARCH_WANT_HUGETLB_PAGE_OPTIMIZE_VMEMMAP
 	select ARCH_WANT_LD_ORPHAN_WARN
 	select ARCH_WANTS_NO_INSTR
 	select BUILDTIME_TABLE_SORT
_

Patches currently in -mm which might be from chenfeiyang@loongson.cn are

mipsloongarchnios2-adjust-prototypes-of-pd_init.patch
loongarch-add-sparse-memory-vmemmap-support.patch
mm-sparse-vmemmap-generalise-vmemmap_populate_hugepages.patch
loongarch-enable-arch_want_hugetlb_page_optimize_vmemmap.patch