[PATCH V3 2/2] arm64/mm: Change offset base address in [pud|pmd]_free_[pmd|pte]_page()

[Anshuman Khandual <anshuman.khandual@arm.com>]

Pgtable page address can be fetched with [pmd|pte]_offset_[kernel] if input
address is PMD_SIZE or PTE_SIZE aligned. Input address is now guaranteed to
be aligned, hence fetched pgtable page address is always correct. But using
0UL as offset base address has been a standard practice across platforms.
It also makes more sense as it isolates pgtable page address computation
from input virtual address alignment. This does not change functionality.

Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: James Morse <james.morse@arm.com>
Cc: Robin Murphy <robin.murphy@arm.com>
---
 arch/arm64/mm/mmu.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/arm64/mm/mmu.c b/arch/arm64/mm/mmu.c
index e97f018ff740..71bcb783aace 100644
--- a/arch/arm64/mm/mmu.c
+++ b/arch/arm64/mm/mmu.c
@@ -1005,7 +1005,7 @@ int pmd_free_pte_page(pmd_t *pmdp, unsigned long addr)
 		return 1;
 	}
 
-	table = pte_offset_kernel(pmdp, addr);
+	table = pte_offset_kernel(pmdp, 0UL);
 	pmd_clear(pmdp);
 	__flush_tlb_kernel_pgtable(addr);
 	pte_free_kernel(NULL, table);
@@ -1026,8 +1026,8 @@ int pud_free_pmd_page(pud_t *pudp, unsigned long addr)
 		return 1;
 	}
 
-	table = pmd_offset(pudp, addr);
-	pmdp = table;
+	table = pmd_offset(pudp, 0UL);
+	pmdp = pmd_offset(pudp, addr);
 	next = addr;
 	end = addr + PUD_SIZE;
 	do {
-- 
2.20.1