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().

[rppt: rebased on v5.15-rc3]

Link: https://lkml.kernel.org/r/1621947349-25421-1-git-send-email-anshuman.khandual@arm.com
Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com>
Acked-by: David Hildenbrand <david@redhat.com>
Acked-by: Mike Rapoport <rppt@linux.ibm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will@kernel.org>
Cc: David Hildenbrand <david@redhat.com>
Cc: Mike Rapoport <rppt@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Mike Rapoport <rppt@linux.ibm.com>
Link: https://lore.kernel.org/r/20210930013039.11260-3-rppt@kernel.org
Signed-off-by: Will Deacon <will@kernel.org>

diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 5c7ae4c..53dd23f 100644 (file)
--- a/arch/arm64/Kconfig
+++ b/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

diff --git a/arch/arm64/include/asm/page.h b/arch/arm64/include/asm/page.h
index f98c91b..993a27e 100644 (file)
--- a/arch/arm64/include/asm/page.h
+++ b/arch/arm64/include/asm/page.h
@@ -41,7 +41,6 @@ void tag_clear_highpage(struct page *to);
 
 typedef struct page *pgtable_t;
 
-int pfn_valid(unsigned long pfn);
 int pfn_is_map_memory(unsigned long pfn);
 
 #include <asm/memory.h>

diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c
index 37a8175..e60c6eb 100644 (file)
--- a/arch/arm64/mm/init.c
+++ b/arch/arm64/mm/init.c
@@ -160,43 +160,6 @@ static void __init zone_sizes_init(unsigned long min, unsigned long max)
        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);