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Subject[RFC 2/2] arm64/mm: Enable ZONE_DEVICE for all page configs
Date
Now that vmemmap_populate_basepages() supports struct vmem_altmap based
allocations, ZONE_DEVICE can be functional across all page size configs.
Now vmemmap_populate_baepages() takes in actual struct vmem_altmap for
allocation and remove_pagetable() should accommodate such new PTE level
vmemmap mappings. Just remove the ARCH_HAS_ZONE_DEVICE dependency from
ARM64_4K_PAGES.

Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com>
---
arch/arm64/Kconfig | 2 +-
arch/arm64/mm/mmu.c | 10 +++++-----
2 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index b5d8cf57e220..4a37a33a4fe5 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -31,7 +31,7 @@ config ARM64
select ARCH_HAS_SYSCALL_WRAPPER
select ARCH_HAS_TEARDOWN_DMA_OPS if IOMMU_SUPPORT
select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
- select ARCH_HAS_ZONE_DEVICE if ARM64_4K_PAGES
+ select ARCH_HAS_ZONE_DEVICE
select ARCH_HAVE_NMI_SAFE_CMPXCHG
select ARCH_INLINE_READ_LOCK if !PREEMPT
select ARCH_INLINE_READ_LOCK_BH if !PREEMPT
diff --git a/arch/arm64/mm/mmu.c b/arch/arm64/mm/mmu.c
index 2859aa89cc4a..509ed7e547a3 100644
--- a/arch/arm64/mm/mmu.c
+++ b/arch/arm64/mm/mmu.c
@@ -818,8 +818,8 @@ static void __meminit free_pud_table(pud_t *pud_start, pgd_t *pgd, bool direct)
#endif

static void __meminit
-remove_pte_table(pte_t *pte_start, unsigned long addr,
- unsigned long end, bool direct)
+remove_pte_table(pte_t *pte_start, unsigned long addr, unsigned long end,
+ bool direct, struct vmem_altmap *altmap)
{
pte_t *pte;

@@ -829,7 +829,7 @@ remove_pte_table(pte_t *pte_start, unsigned long addr,
continue;

if (!direct)
- free_pagetable(pte_page(*pte), 0);
+ free_huge_pagetable(pte_page(*pte), 0, altmap);
spin_lock(&init_mm.page_table_lock);
pte_clear(&init_mm, addr, pte);
spin_unlock(&init_mm.page_table_lock);
@@ -860,7 +860,7 @@ remove_pmd_table(pmd_t *pmd_start, unsigned long addr, unsigned long end,
continue;
}
pte_base = pte_offset_kernel(pmd, 0UL);
- remove_pte_table(pte_base, addr, next, direct);
+ remove_pte_table(pte_base, addr, next, direct, altmap);
free_pte_table(pte_base, pmd, direct);
}
}
@@ -921,7 +921,7 @@ remove_pagetable(unsigned long start, unsigned long end,
int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node,
struct vmem_altmap *altmap)
{
- return vmemmap_populate_basepages(start, end, node, NULL);
+ return vmemmap_populate_basepages(start, end, node, altmap);
}
#else /* !ARM64_SWAPPER_USES_SECTION_MAPS */
int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node,
--
2.20.1
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