mm: remove PageMlocked

This flag is now only used on folios, so we can remove all the page
accessors.

Link: https://lkml.kernel.org/r/20240821193445.2294269-7-willy@infradead.orgSigned-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

Documentation/mm/unevictable-lru.rst

@@ -253,8 +253,8 @@ Basic Management
 
 mlocked pages - pages mapped into a VM_LOCKED VMA - are a class of unevictable
 pages.  When such a page has been "noticed" by the memory management subsystem,
-the page is marked with the PG_mlocked flag.  This can be manipulated using the
-PageMlocked() functions.
+the folio is marked with the PG_mlocked flag.  This can be manipulated using
+folio_set_mlocked() and folio_clear_mlocked() functions.
 
 A PG_mlocked page will be placed on the unevictable list when it is added to
 the LRU.  Such pages can be "noticed" by memory management in several places:

include/linux/page-flags.h

@@ -585,12 +585,15 @@ FOLIO_FLAG(unevictable, FOLIO_HEAD_PAGE)
 	FOLIO_TEST_CLEAR_FLAG(unevictable, FOLIO_HEAD_PAGE)
 
 #ifdef CONFIG_MMU
-PAGEFLAG(Mlocked, mlocked, PF_NO_TAIL)
-	__CLEARPAGEFLAG(Mlocked, mlocked, PF_NO_TAIL)
-	TESTSCFLAG(Mlocked, mlocked, PF_NO_TAIL)
+FOLIO_FLAG(mlocked, FOLIO_HEAD_PAGE)
+	__FOLIO_CLEAR_FLAG(mlocked, FOLIO_HEAD_PAGE)
+	FOLIO_TEST_CLEAR_FLAG(mlocked, FOLIO_HEAD_PAGE)
+	FOLIO_TEST_SET_FLAG(mlocked, FOLIO_HEAD_PAGE)
 #else
-PAGEFLAG_FALSE(Mlocked, mlocked) __CLEARPAGEFLAG_NOOP(Mlocked, mlocked)
-	TESTSCFLAG_FALSE(Mlocked, mlocked)
+FOLIO_FLAG_FALSE(mlocked)
+	__FOLIO_CLEAR_FLAG_NOOP(mlocked)
+	FOLIO_TEST_CLEAR_FLAG_FALSE(mlocked)
+	FOLIO_TEST_SET_FLAG_FALSE(mlocked)
 #endif
 
 #ifdef CONFIG_ARCH_USES_PG_UNCACHED