Commit 23647618 authored by Anshuman Khandual's avatar Anshuman Khandual Committed by Linus Torvalds
Browse files

mm/debug_vm_pgtable: update comments regarding migration swap entries 

Commit 4dd845b5 ("mm/swapops: rework swap entry manipulation code")
had changed migtation entry related helpers.  Just update
debug_vm_pgatble() synced documentation to reflect those changes.

Link: https://lkml.kernel.org/r/1641880417-24848-1-git-send-email-anshuman.khandual@arm.com


Signed-off-by: default avatarAnshuman Khandual <anshuman.khandual@arm.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 3e9d80a8

Documentation/vm/arch_pgtable_helpers.rst

+7 −7
Original line number Diff line number Diff line
@@ -247,12 +247,12 @@ SWAP Page Table Helpers 
| __swp_to_pmd_entry        | Creates a mapped PMD from a swapped entry (arch) |

+---------------------------+--------------------------------------------------+

| is_migration_entry        | Tests a migration (read or write) swapped entry  |

+---------------------------+--------------------------------------------------+

| is_write_migration_entry  | Tests a write migration swapped entry            |

+---------------------------+--------------------------------------------------+

| make_migration_entry_read | Converts into read migration swapped entry       |

+---------------------------+--------------------------------------------------+

| make_migration_entry      | Creates a migration swapped entry (read or write)|

+---------------------------+--------------------------------------------------+

+-------------------------------+----------------------------------------------+

| is_writable_migration_entry   | Tests a write migration swapped entry        |

+-------------------------------+----------------------------------------------+

| make_readable_migration_entry | Creates a read migration swapped entry       |

+-------------------------------+----------------------------------------------+

| make_writable_migration_entry | Creates a write migration swapped entry      |

+-------------------------------+----------------------------------------------+



[1] https://lore.kernel.org/linux-mm/20181017020930.GN30832@redhat.com/

mm/debug_vm_pgtable.c

+2 −2
Original line number Diff line number Diff line
@@ -888,8 +888,8 @@ static void __init swap_migration_tests(struct pgtable_debug_args *args) 
	pr_debug("Validating swap migration\n");



	/*

	 * make_migration_entry() expects given page to be

	 * locked, otherwise it stumbles upon a BUG_ON().

	 * make_[readable|writable]_migration_entry() expects given page to

	 * be locked, otherwise it stumbles upon a BUG_ON().

	 */

	__SetPageLocked(page);

	swp = make_writable_migration_entry(page_to_pfn(page));