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mm/swapfile: delete outdated pte_offset_map() comment 

Delete a triply out-of-date comment from add_swap_count_continuation():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.

Link: https://lkml.kernel.org/r/9022632b-ba9d-8cb0-c25-4be9786481b5@google.com
Signed-off-by: Hugh Dickins <hughd@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Hugh Dickins 2023-06-19 23:50:00 -07:00 committed by Andrew Morton
parent 61167ad5fe
commit 3fda49e89f
1 changed files with 0 additions and 5 deletions
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5
mm/swapfile.c
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@ -3456,11 +3456,6 @@ int add_swap_count_continuation(swp_entry_t entry, gfp_t gfp_mask)
goto out; 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); head = vmalloc_to_page(si->swap_map + offset);
offset &= ~PAGE_MASK; offset &= ~PAGE_MASK;