From: Anshuman Khandual <anshuman.khandual@xxxxxxx> Subject: arm64/mm: drop HAVE_ARCH_PFN_VALID CONFIG_SPARSEMEM_VMEMMAP is now the only available memory model on arm64 platforms and free_unused_memmap() would just return without creating any holes in the memmap mapping. There is no need for any special handling in pfn_valid() and HAVE_ARCH_PFN_VALID can just be dropped. This also moves the pfn upper bits sanity check into generic pfn_valid(). Link: https://lkml.kernel.org/r/1621947349-25421-1-git-send-email-anshuman.khandual@xxxxxxx Signed-off-by: Anshuman Khandual <anshuman.khandual@xxxxxxx> Acked-by: David Hildenbrand <david@xxxxxxxxxx> Acked-by: Mike Rapoport <rppt@xxxxxxxxxxxxx> Cc: Catalin Marinas <catalin.marinas@xxxxxxx> Cc: Will Deacon <will@xxxxxxxxxx> Cc: David Hildenbrand <david@xxxxxxxxxx> Cc: Mike Rapoport <rppt@xxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- arch/arm64/Kconfig | 1 arch/arm64/include/asm/page.h | 1 arch/arm64/mm/init.c | 37 -------------------------------- include/linux/mmzone.h | 9 +++++++ 4 files changed, 9 insertions(+), 39 deletions(-) --- a/arch/arm64/include/asm/page.h~arm64-mm-drop-have_arch_pfn_valid +++ a/arch/arm64/include/asm/page.h @@ -37,7 +37,6 @@ void copy_highpage(struct page *to, stru typedef struct page *pgtable_t; -int pfn_valid(unsigned long pfn); int pfn_is_map_memory(unsigned long pfn); #include <asm/memory.h> --- a/arch/arm64/Kconfig~arm64-mm-drop-have_arch_pfn_valid +++ a/arch/arm64/Kconfig @@ -154,7 +154,6 @@ config ARM64 select HAVE_ARCH_KGDB select HAVE_ARCH_MMAP_RND_BITS select HAVE_ARCH_MMAP_RND_COMPAT_BITS if COMPAT - select HAVE_ARCH_PFN_VALID select HAVE_ARCH_PREL32_RELOCATIONS select HAVE_ARCH_RANDOMIZE_KSTACK_OFFSET select HAVE_ARCH_SECCOMP_FILTER --- a/arch/arm64/mm/init.c~arm64-mm-drop-have_arch_pfn_valid +++ a/arch/arm64/mm/init.c @@ -219,43 +219,6 @@ static void __init zone_sizes_init(unsig free_area_init(max_zone_pfns); } -int pfn_valid(unsigned long pfn) -{ - phys_addr_t addr = PFN_PHYS(pfn); - struct mem_section *ms; - - /* - * Ensure the upper PAGE_SHIFT bits are clear in the - * pfn. Else it might lead to false positives when - * some of the upper bits are set, but the lower bits - * match a valid pfn. - */ - if (PHYS_PFN(addr) != pfn) - return 0; - - if (pfn_to_section_nr(pfn) >= NR_MEM_SECTIONS) - return 0; - - ms = __pfn_to_section(pfn); - if (!valid_section(ms)) - return 0; - - /* - * ZONE_DEVICE memory does not have the memblock entries. - * memblock_is_map_memory() check for ZONE_DEVICE based - * addresses will always fail. Even the normal hotplugged - * memory will never have MEMBLOCK_NOMAP flag set in their - * memblock entries. Skip memblock search for all non early - * memory sections covering all of hotplug memory including - * both normal and ZONE_DEVICE based. - */ - if (!early_section(ms)) - return pfn_section_valid(ms, pfn); - - return memblock_is_memory(addr); -} -EXPORT_SYMBOL(pfn_valid); - int pfn_is_map_memory(unsigned long pfn) { phys_addr_t addr = PFN_PHYS(pfn); --- a/include/linux/mmzone.h~arm64-mm-drop-have_arch_pfn_valid +++ a/include/linux/mmzone.h @@ -1460,6 +1460,15 @@ static inline int pfn_valid(unsigned lon { struct mem_section *ms; + /* + * Ensure the upper PAGE_SHIFT bits are clear in the + * pfn. Else it might lead to false positives when + * some of the upper bits are set, but the lower bits + * match a valid pfn. + */ + if (PHYS_PFN(PFN_PHYS(pfn)) != pfn) + return 0; + if (pfn_to_section_nr(pfn) >= NR_MEM_SECTIONS) return 0; ms = __nr_to_section(pfn_to_section_nr(pfn)); _
