mm: remove munlock_vma_page()

All callers now have a folio and can call munlock_vma_folio().  Update the
documentation to refer to munlock_vma_folio().

Link: https://lkml.kernel.org/r/20230116192827.2146732-4-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

@@ -486,7 +486,7 @@ Before the unevictable/mlock changes, mlocking did not mark the pages in any
 way, so unmapping them required no processing.
 
 For each PTE (or PMD) being unmapped from a VMA, page_remove_rmap() calls
-munlock_vma_page(), which calls munlock_page() when the VMA is VM_LOCKED
+munlock_vma_folio(), which calls munlock_folio() when the VMA is VM_LOCKED
 (unless it was a PTE mapping of a part of a transparent huge page).
 
 munlock_page() uses the mlock pagevec to batch up work to be done under
@@ -510,7 +510,7 @@ which had been Copied-On-Write from the file pages now being truncated.
 
 Mlocked pages can be munlocked and deleted in this way: like with munmap(),
 for each PTE (or PMD) being unmapped from a VMA, page_remove_rmap() calls
-munlock_vma_page(), which calls munlock_page() when the VMA is VM_LOCKED
+munlock_vma_folio(), which calls munlock_folio() when the VMA is VM_LOCKED
 (unless it was a PTE mapping of a part of a transparent huge page).
 
 However, if there is a racing munlock(), since mlock_vma_pages_range() starts

kernel/events/uprobes.c

@@ -22,7 +22,6 @@
 #include <linux/swap.h>		/* folio_free_swap */
 #include <linux/ptrace.h>	/* user_enable_single_step */
 #include <linux/kdebug.h>	/* notifier mechanism */
-#include "../../mm/internal.h"	/* munlock_vma_page */
 #include <linux/percpu-rwsem.h>
 #include <linux/task_work.h>
 #include <linux/shmem_fs.h>

mm/internal.h

@@ -548,7 +548,6 @@ static inline void mlock_vma_folio(struct folio *folio,
 }
 
 void munlock_folio(struct folio *folio);
-
 static inline void munlock_vma_folio(struct folio *folio,
 			struct vm_area_struct *vma, bool compound)
 {
@@ -557,11 +556,6 @@ static inline void munlock_vma_folio(struct folio *folio,
 		munlock_folio(folio);
 }
 
-static inline void munlock_vma_page(struct page *page,
-			struct vm_area_struct *vma, bool compound)
-{
-	munlock_vma_folio(page_folio(page), vma, compound);
-}
 void mlock_new_folio(struct folio *folio);
 bool need_mlock_drain(int cpu);
 void mlock_drain_local(void);
@@ -650,8 +644,6 @@ static inline struct file *maybe_unlock_mmap_for_io(struct vm_fault *vmf,
 }
 #else /* !CONFIG_MMU */
 static inline void unmap_mapping_folio(struct folio *folio) { }
-static inline void munlock_vma_page(struct page *page,
-			struct vm_area_struct *vma, bool compound) { }
 static inline void mlock_new_folio(struct folio *folio) { }
 static inline bool need_mlock_drain(int cpu) { return false; }
 static inline void mlock_drain_local(void) { }

mm/rmap.c

@@ -1431,14 +1431,14 @@ void page_remove_rmap(struct page *page, struct vm_area_struct *vma,
 	}
 
 	/*
-	 * It would be tidy to reset PageAnon mapping when fully unmapped,
-	 * but that might overwrite a racing page_add_anon_rmap
-	 * which increments mapcount after us but sets mapping
-	 * before us: so leave the reset to free_pages_prepare,
-	 * and remember that it's only reliable while mapped.
+	 * It would be tidy to reset folio_test_anon mapping when fully
+	 * unmapped, but that might overwrite a racing page_add_anon_rmap
+	 * which increments mapcount after us but sets mapping before us:
+	 * so leave the reset to free_pages_prepare, and remember that
+	 * it's only reliable while mapped.
 	 */
 
-	munlock_vma_page(page, vma, compound);
+	munlock_vma_folio(folio, vma, compound);
 }
 
 /*