Unverified Commit 5a7ac592 authored by Kefeng Wang's avatar Kefeng Wang Committed by Palmer Dabbelt
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riscv: mm: Enable PMD split page table lock for RV64 



After commit 1355c31e ("asm-generic: pgalloc: provide generic
pmd_alloc_one() and pmd_free_one()"), the main part to support
PMD split page table lock is in asm-generic/pgalloc.h.

The only change is add pgtable_pmd_page_ctor() into alloc_pmd_late(),
then we could enable ARCH_ENABLE_SPLIT_PMD_PTLOCK for RV64.

Reviewed-by: default avatarAlexandre Ghiti <alex@ghiti.fr>
Signed-off-by: default avatarKefeng Wang <wangkefeng.wang@huawei.com>
Signed-off-by: default avatarPalmer Dabbelt <palmer@rivosinc.com>
parent 7cc8c75b

arch/riscv/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -14,6 +14,7 @@ config RISCV 
	def_bool y

	select ARCH_CLOCKSOURCE_INIT

	select ARCH_ENABLE_HUGEPAGE_MIGRATION if HUGETLB_PAGE && MIGRATION

	select ARCH_ENABLE_SPLIT_PMD_PTLOCK if PGTABLE_LEVELS > 2

	select ARCH_HAS_BINFMT_FLAT

	select ARCH_HAS_DEBUG_VM_PGTABLE

	select ARCH_HAS_DEBUG_VIRTUAL if MMU

arch/riscv/mm/init.c

+2 −1
Original line number Diff line number Diff line
@@ -367,7 +367,8 @@ static phys_addr_t __init alloc_pmd_late(uintptr_t va) 
	unsigned long vaddr;



	vaddr = __get_free_page(GFP_KERNEL);

	BUG_ON(!vaddr);

	BUG_ON(!vaddr || !pgtable_pmd_page_ctor(virt_to_page(vaddr)));



	return __pa(vaddr);

}