* + arm64-mm-drop-have_arch_pfn_valid.patch added to -mm tree
@ 2021-06-15 0:11 akpm
0 siblings, 0 replies; only message in thread
From: akpm @ 2021-06-15 0:11 UTC (permalink / raw
To: anshuman.khandual, catalin.marinas, david, mm-commits, rppt, rppt,
will
The patch titled
Subject: arm64/mm: drop HAVE_ARCH_PFN_VALID
has been added to the -mm tree. Its filename is
arm64-mm-drop-have_arch_pfn_valid.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/arm64-mm-drop-have_arch_pfn_valid.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/arm64-mm-drop-have_arch_pfn_valid.patch
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------------------------------------------------------
From: Anshuman Khandual <anshuman.khandual@arm.com>
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@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>
---
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));
_
Patches currently in -mm which might be from anshuman.khandual@arm.com are
mm-debug_vm_pgtable-ensure-thp-availability-via-has_transparent_hugepage.patch
arm64-mm-drop-have_arch_pfn_valid.patch
mm-thp-make-alloc_split_ptlocks-dependent-on-use_split_pte_ptlocks.patch
mm-thp-make-arch_enable_split_pmd_ptlock-dependent-on-pgtable_levels-2.patch
mm-define-default-value-for-first_user_address.patch
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2021-06-15 0:11 + arm64-mm-drop-have_arch_pfn_valid.patch added to -mm tree akpm
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