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arm64/mm: drop HAVE_ARCH_PFN_VALID

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commit 3de360c3fd upstream.

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>
Fixes: 859a85ddf9 ("mm: remove pfn_valid_within() and CONFIG_HOLES_IN_ZONE")
Link: https://lore.kernel.org/r/Yl0IZWT2nsiYtqBT@linux.ibm.com
Signed-off-by: Georgi Djakov <quic_c_gdjako@quicinc.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Anshuman Khandual 2021-09-30 04:30:39 +03:00 committed by Greg Kroah-Hartman
parent c01430cf5b
commit 3f7b1a87ac
3 changed files with 0 additions and 39 deletions
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1
arch/arm64/Kconfig
View File

@ -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

1
arch/arm64/include/asm/page.h
View File

@ -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>

37
arch/arm64/mm/init.c
View File

@ -184,43 +184,6 @@ 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);