mm: rename mm_put_huge_zero_page to mm_put_huge_zero_folio

Also remove mm_get_huge_zero_page() now it has no users.

Link: https://lkml.kernel.org/r/20240326202833.523759-9-willy@infradead.orgSigned-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

include/linux/huge_mm.h

@@ -367,12 +367,7 @@ static inline bool is_huge_zero_pud(pud_t pud)
 }
 
 struct folio *mm_get_huge_zero_folio(struct mm_struct *mm);
-void mm_put_huge_zero_page(struct mm_struct *mm);
-
-static inline struct page *mm_get_huge_zero_page(struct mm_struct *mm)
-{
-	return &mm_get_huge_zero_folio(mm)->page;
-}
+void mm_put_huge_zero_folio(struct mm_struct *mm);
 
 #define mk_huge_pmd(page, prot) pmd_mkhuge(mk_pmd(page, prot))
 
@@ -500,7 +495,7 @@ static inline bool is_huge_zero_pud(pud_t pud)
 	return false;
 }
 
-static inline void mm_put_huge_zero_page(struct mm_struct *mm)
+static inline void mm_put_huge_zero_folio(struct mm_struct *mm)
 {
 	return;
 }

kernel/fork.c

@@ -1344,7 +1344,7 @@ static inline void __mmput(struct mm_struct *mm)
 	ksm_exit(mm);
 	khugepaged_exit(mm); /* must run before exit_mmap */
 	exit_mmap(mm);
-	mm_put_huge_zero_page(mm);
+	mm_put_huge_zero_folio(mm);
 	set_mm_exe_file(mm, NULL);
 	if (!list_empty(&mm->mmlist)) {
 		spin_lock(&mmlist_lock);

mm/huge_memory.c

@@ -241,7 +241,7 @@ struct folio *mm_get_huge_zero_folio(struct mm_struct *mm)
 	return READ_ONCE(huge_zero_folio);
 }
 
-void mm_put_huge_zero_page(struct mm_struct *mm)
+void mm_put_huge_zero_folio(struct mm_struct *mm)
 {
 	if (test_bit(MMF_HUGE_ZERO_PAGE, &mm->flags))
 		put_huge_zero_page();