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 memhp_range_allowed()
has already been called.
Cc: Catalin Marinas <catalin.marinas@xxxxxxx>
Cc: Will Deacon <will@xxxxxxxxxx>
Cc: Ard Biesheuvel <ardb@xxxxxxxxxx>
Cc: Mark Rutland <mark.rutland@xxxxxxx>
Cc: David Hildenbrand <david@xxxxxxxxxx>
Cc: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx
Cc: linux-kernel@xxxxxxxxxxxxxxx
Signed-off-by: Anshuman Khandual <anshuman.khandual@xxxxxxx>
---
arch/arm64/mm/mmu.c | 15 +++++++--------
1 file changed, 7 insertions(+), 8 deletions(-)
diff --git a/arch/arm64/mm/mmu.c b/arch/arm64/mm/mmu.c
index ca692a815731..54705dcacb4e 100644
--- a/arch/arm64/mm/mmu.c
+++ b/arch/arm64/mm/mmu.c
@@ -1444,16 +1444,19 @@ static void __remove_pgd_mapping(pgd_t *pgdir, unsigned long start, u64 size)
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 memhp_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);
+ memhp_range.start = __pa(_PAGE_OFFSET(vabits_actual));
+ memhp_range.end = __pa(PAGE_END - 1);
+ return memhp_range;
}
int arch_add_memory(int nid, u64 start, u64 size,
@@ -1461,11 +1464,7 @@ int arch_add_memory(int nid, u64 start, u64 size,
{
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(!memhp_range_allowed(start, size, 1));
if (rodata_full || debug_pagealloc_enabled())
flags = NO_BLOCK_MAPPINGS | NO_CONT_MAPPINGS;
--
2.20.1
