Just like the way we calculate next for pud and pmd, aka
round down and add size.
Also, do not do boundary-checking with 'next', and just pass 'end' down
to phys_pud_init() instead. Because the loop in phys_pud_init() stops at
PTRS_PER_PUD and thus can handle a possibly bigger 'end' properly.
Signed-off-by: Yinghai Lu <ying...@kernel.org>
---
arch/x86/mm/init_64.c | 6 ++----
1 file changed, 2 insertions(+), 4 deletions(-)
diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
index 167439c..b1178eb 100644
--- a/arch/x86/mm/init_64.c
+++ b/arch/x86/mm/init_64.c
@@ -530,9 +530,7 @@ kernel_physical_mapping_init(unsigned long start,
pgd_t *pgd = pgd_offset_k(start);
pud_t *pud;
- next = (start + PGDIR_SIZE) & PGDIR_MASK;
- if (next > end)
- next = end;
+ next = (start & PGDIR_MASK) + PGDIR_SIZE;
if (pgd_val(*pgd)) {
pud = (pud_t *)pgd_page_vaddr(*pgd);
@@ -542,7 +540,7 @@ kernel_physical_mapping_init(unsigned long start,
}
pud = alloc_low_page();
- last_map_addr = phys_pud_init(pud, __pa(start), __pa(next),
+ last_map_addr = phys_pud_init(pud, __pa(start), __pa(end),
page_size_mask);
spin_lock(&init_mm.page_table_lock);
--
1.7.10.4
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