linux-kernel - [PATCH v3 5/5] Documentation/mm: Update references to __m[un]lock_page() to *

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Date:   Mon, 26 Dec 2022 08:44:23 +0000
From:   Lorenzo Stoakes <lstoakes@...il.com>
To:     linux-mm@...ck.org, Andrew Morton <akpm@...ux-foundation.org>,
        linux-kernel@...r.kernel.org
Cc:     Matthew Wilcox <willy@...radead.org>,
        Hugh Dickins <hughd@...gle.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Liam Howlett <liam.howlett@...cle.com>,
        William Kucharski <william.kucharski@...cle.com>,
        Christian Brauner <brauner@...nel.org>,
        Jonathan Corbet <corbet@....net>,
        Mike Rapoport <rppt@...nel.org>,
        Joel Fernandes <joel@...lfernandes.org>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Lorenzo Stoakes <lstoakes@...il.com>
Subject: [PATCH v3 5/5] Documentation/mm: Update references to __m[un]lock_page() to *_folio()

We now pass folios to these functions, so update the documentation
accordingly.

Additionally, correct the outdated reference to __pagevec_lru_add_fn(), the
referenced action occurs in __munlock_folio() directly now.

Signed-off-by: Lorenzo Stoakes <lstoakes@...il.com>
---
 Documentation/mm/unevictable-lru.rst | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/Documentation/mm/unevictable-lru.rst b/Documentation/mm/unevictable-lru.rst
index 4a0e158aa9ce..153629e0c100 100644
--- a/Documentation/mm/unevictable-lru.rst
+++ b/Documentation/mm/unevictable-lru.rst
@@ -308,22 +308,22 @@ do end up getting faulted into this VM_LOCKED VMA, they will be handled in the
 fault path - which is also how mlock2()'s MLOCK_ONFAULT areas are handled.
 
 For each PTE (or PMD) being faulted into a VMA, the page add rmap function
-calls mlock_vma_page(), which calls mlock_page() when the VMA is VM_LOCKED
+calls mlock_vma_page(), which calls mlock_folio() when the VMA is VM_LOCKED
 (unless it is a PTE mapping of a part of a transparent huge page).  Or when
 it is a newly allocated anonymous page, lru_cache_add_inactive_or_unevictable()
-calls mlock_new_page() instead: similar to mlock_page(), but can make better
+calls mlock_new_folio() instead: similar to mlock_folio(), but can make better
 judgments, since this page is held exclusively and known not to be on LRU yet.
 
-mlock_page() sets PageMlocked immediately, then places the page on the CPU's
-mlock pagevec, to batch up the rest of the work to be done under lru_lock by
-__mlock_page().  __mlock_page() sets PageUnevictable, initializes mlock_count
+mlock_folio() sets PageMlocked immediately, then places the page on the CPU's
+mlock folio batch, to batch up the rest of the work to be done under lru_lock by
+__mlock_folio().  __mlock_folio() sets PageUnevictable, initializes mlock_count
 and moves the page to unevictable state ("the unevictable LRU", but with
 mlock_count in place of LRU threading).  Or if the page was already PageLRU
 and PageUnevictable and PageMlocked, it simply increments the mlock_count.
 
 But in practice that may not work ideally: the page may not yet be on an LRU, or
 it may have been temporarily isolated from LRU.  In such cases the mlock_count
-field cannot be touched, but will be set to 0 later when __pagevec_lru_add_fn()
+field cannot be touched, but will be set to 0 later when __munlock_folio()
 returns the page to "LRU".  Races prohibit mlock_count from being set to 1 then:
 rather than risk stranding a page indefinitely as unevictable, always err with
 mlock_count on the low side, so that when munlocked the page will be rescued to
-- 
2.39.0