Re: [PATCH v3 1/8] mm: Remove special swap entry functions

On Fri, Feb 26, 2021 at 06:18:25PM +1100, Alistair Popple wrote:

Remove the migration and device private entry_to_page() and
entry_to_pfn() inline functions and instead open code them directly.
This results in shorter code which is easier to understand.

Signed-off-by: Alistair Popple <apopple@nvidia.com>
---
 arch/s390/mm/pgtable.c  |  2 +-
 fs/proc/task_mmu.c      | 23 +++++++------------
 include/linux/swap.h    |  4 ++--
 include/linux/swapops.h | 51 ++++-------------------------------------
 mm/hmm.c                |  5 ++--
 mm/memcontrol.c         |  2 +-
 mm/memory.c             | 10 ++++----
 mm/migrate.c            |  6 ++---
 mm/page_vma_mapped.c    |  6 ++---
 9 files changed, 30 insertions(+), 79 deletions(-)

I wish you could come up with a more descriptive word that special
here

What I understand is this is true when the swap_offset is a pfn?

-static inline struct page *migration_entry_to_page(swp_entry_t entry)
-{
-	struct page *p = pfn_to_page(swp_offset(entry));
-	/*
-	 * Any use of migration entries may only occur while the
-	 * corresponding page is locked
-	 */
-	BUG_ON(!PageLocked(compound_head(p)));
-	return p;

And this constraint has been completely lost?

A comment in front of the is_special_entry explaining all the rule
would help alot

Transformation looks fine otherwise

Jason