[PATCH] mm/swapfile: delete outdated pte_offset_map() comment

Hugh Dickins
2023-06-20T06:50:16Z

Delete a triply out-of-date comment from add_swap_count_continuation():
1. vmalloc_to_page() changed from pte_offset_map() to pte_offset_kernel()
2. pte_offset_map() changed from using kmap_atomic() to kmap_local_page()
3. kmap_atomic() changed from using fixed FIX_KMAP addresses in 2.6.37.

Signed-off-by: Hugh Dickins <hughd@google.com>
---
Here's a late "33/32" to the series just moved to mm-stable - thank you!

mm/swapfile.c | 5 -----
1 file changed, 5 deletions(-)

diff --git a/mm/swapfile.c b/mm/swapfile.c
index 12d204e6dae2..0a17d85b50cb 100644
--- a/mm/swapfile.c
+++ b/mm/swapfile.c
@@ -3470,11 +3470,6 @@ int add_swap_count_continuation(swp_entry_t entry, gfp_t gfp_mask)
goto out;
}

- /*
- * We are fortunate that although vmalloc_to_page uses pte_offset_map,
- * no architecture is using highmem pages for kernel page tables: so it
- * will not corrupt the GFP_ATOMIC caller's atomic page table kmaps.
- */
head = vmalloc_to_page(si->swap_map + offset);
offset &= ~PAGE_MASK;

--
2.35.3