The patch titled
Subject: arm64/mm: define arch_get_mappable_range()
has been added to the -mm tree. Its filename is
arm64-mm-define-arch_get_mappable_range.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/arm64-mm-define-arch_get_mappable_range.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/arm64-mm-define-arch_get_mappable_range.patch
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------------------------------------------------------
From: Anshuman Khandual <anshuman.khandual@xxxxxxx>
Subject: arm64/mm: define arch_get_mappable_range()
This overrides arch_get_mappable_range() on arm64 platform which will be
used with recently added generic framework. It drops
inside_linear_region() and subsequent check in arch_add_memory() which are
no longer required. It also adds a VM_BUG_ON() check that would ensure
that mhp_range_allowed() has already been called.
Link: https://lkml.kernel.org/r/1612149902-7867-3-git-send-email-anshuman.khandual@xxxxxxx
Signed-off-by: Anshuman Khandual <anshuman.khandual@xxxxxxx>
Reviewed-by: David Hildenbrand <david@xxxxxxxxxx>
Cc: Catalin Marinas <catalin.marinas@xxxxxxx>
Cc: Will Deacon <will@xxxxxxxxxx>
Cc: Ard Biesheuvel <ardb@xxxxxxxxxx>
Cc: Mark Rutland <mark.rutland@xxxxxxx>
Cc: Heiko Carstens <hca@xxxxxxxxxxxxx>
Cc: Jason Wang <jasowang@xxxxxxxxxx>
Cc: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>
Cc: "Michael S. Tsirkin" <mst@xxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxxxx>
Cc: Oscar Salvador <osalvador@xxxxxxx>
Cc: Pankaj Gupta <pankaj.gupta@xxxxxxxxxxxxxxx>
Cc: Pankaj Gupta <pankaj.gupta.linux@xxxxxxxxx>
Cc: teawater <teawaterz@xxxxxxxxxxxxxxxxx>
Cc: Vasily Gorbik <gor@xxxxxxxxxxxxx>
Cc: Wei Yang <richard.weiyang@xxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/arm64/mm/mmu.c | 15 +++++++--------
1 file changed, 7 insertions(+), 8 deletions(-)
--- a/arch/arm64/mm/mmu.c~arm64-mm-define-arch_get_mappable_range
+++ a/arch/arm64/mm/mmu.c
@@ -1442,16 +1442,19 @@ static void __remove_pgd_mapping(pgd_t *
free_empty_tables(start, end, PAGE_OFFSET, PAGE_END);
}
-static bool inside_linear_region(u64 start, u64 size)
+struct range arch_get_mappable_range(void)
{
+ struct range mhp_range;
+
/*
* Linear mapping region is the range [PAGE_OFFSET..(PAGE_END - 1)]
* accommodating both its ends but excluding PAGE_END. Max physical
* range which can be mapped inside this linear mapping range, must
* also be derived from its end points.
*/
- return start >= __pa(_PAGE_OFFSET(vabits_actual)) &&
- (start + size - 1) <= __pa(PAGE_END - 1);
+ mhp_range.start = __pa(_PAGE_OFFSET(vabits_actual));
+ mhp_range.end = __pa(PAGE_END - 1);
+ return mhp_range;
}
int arch_add_memory(int nid, u64 start, u64 size,
@@ -1459,11 +1462,7 @@ int arch_add_memory(int nid, u64 start,
{
int ret, flags = 0;
- if (!inside_linear_region(start, size)) {
- pr_err("[%llx %llx] is outside linear mapping region\n", start, start + size);
- return -EINVAL;
- }
-
+ VM_BUG_ON(!mhp_range_allowed(start, size, true));
if (rodata_full || debug_pagealloc_enabled())
flags = NO_BLOCK_MAPPINGS | NO_CONT_MAPPINGS;
_
Patches currently in -mm which might be from anshuman.khandual@xxxxxxx are
mm-debug_vm_pgtable-basic-add-validation-for-dirtiness-after-write-protect.patch
mm-debug_vm_pgtable-basic-iterate-over-entire-protection_map.patch
mm-memory_hotplug-rename-all-existing-memhp-into-mhp.patch
mm-memory_hotplug-prevalidate-the-address-range-being-added-with-platform.patch
arm64-mm-define-arch_get_mappable_range.patch
s390-mm-define-arch_get_mappable_range.patch
