mm: shmem: rename shmem_is_huge() to shmem_huge_global_enabled()

shmem_is_huge() is now used to check if the top-level huge page is
enabled, thus rename it to reflect its usage.

Link: https://lkml.kernel.org/r/da53296e0ab6359aa083561d9dc01e4223d60fbe.1721626645.git.baolin.wang@linux.alibaba.comSigned-off-by: Baolin Wang <baolin.wang@linux.alibaba.com>
Reviewed-by: Ryan Roberts <ryan.roberts@arm.com>
Acked-by: David Hildenbrand <david@redhat.com>
Cc: Barry Song <21cnbao@gmail.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Lance Yang <ioworker0@gmail.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Zi Yan <ziy@nvidia.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

include/linux/shmem_fs.h

@@ -111,14 +111,15 @@ extern void shmem_truncate_range(struct inode *inode, loff_t start, loff_t end);
 int shmem_unuse(unsigned int type);
 
 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
-extern bool shmem_is_huge(struct inode *inode, pgoff_t index, bool shmem_huge_force,
+extern bool shmem_huge_global_enabled(struct inode *inode, pgoff_t index, bool shmem_huge_force,
 				      struct mm_struct *mm, unsigned long vm_flags);
 unsigned long shmem_allowable_huge_orders(struct inode *inode,
 				struct vm_area_struct *vma, pgoff_t index,
 				bool global_huge);
 #else
-static __always_inline bool shmem_is_huge(struct inode *inode, pgoff_t index, bool shmem_huge_force,
-					  struct mm_struct *mm, unsigned long vm_flags)
+static __always_inline bool shmem_huge_global_enabled(struct inode *inode, pgoff_t index,
+						      bool shmem_huge_force, struct mm_struct *mm,
+						      unsigned long vm_flags)
 {
 	return false;
 }

mm/huge_memory.c

@@ -160,8 +160,9 @@ unsigned long __thp_vma_allowable_orders(struct vm_area_struct *vma,
 	 * own flags.
 	 */
 	if (!in_pf && shmem_file(vma->vm_file)) {
-		bool global_huge = shmem_is_huge(file_inode(vma->vm_file), vma->vm_pgoff,
-							!enforce_sysfs, vma->vm_mm, vm_flags);
+		bool global_huge = shmem_huge_global_enabled(file_inode(vma->vm_file),
+							     vma->vm_pgoff, !enforce_sysfs,
+							     vma->vm_mm, vm_flags);
 
 		if (!vma_is_anon_shmem(vma))
 			return global_huge ? orders : 0;

mm/shmem.c

@@ -548,7 +548,7 @@ static bool shmem_confirm_swap(struct address_space *mapping,
 
 static int shmem_huge __read_mostly = SHMEM_HUGE_NEVER;
 
-static bool __shmem_is_huge(struct inode *inode, pgoff_t index,
+static bool __shmem_huge_global_enabled(struct inode *inode, pgoff_t index,
 					bool shmem_huge_force, struct mm_struct *mm,
 					unsigned long vm_flags)
 {
@@ -581,14 +581,15 @@ static bool __shmem_is_huge(struct inode *inode, pgoff_t index,
 	}
 }
 
-bool shmem_is_huge(struct inode *inode, pgoff_t index,
+bool shmem_huge_global_enabled(struct inode *inode, pgoff_t index,
 		   bool shmem_huge_force, struct mm_struct *mm,
 		   unsigned long vm_flags)
 {
 	if (HPAGE_PMD_ORDER > MAX_PAGECACHE_ORDER)
 		return false;
 
-	return __shmem_is_huge(inode, index, shmem_huge_force, mm, vm_flags);
+	return __shmem_huge_global_enabled(inode, index, shmem_huge_force,
+					   mm, vm_flags);
 }
 
 #if defined(CONFIG_SYSFS)
@@ -1156,7 +1157,7 @@ static int shmem_getattr(struct mnt_idmap *idmap,
 			STATX_ATTR_NODUMP);
 	generic_fillattr(idmap, request_mask, inode, stat);
 
-	if (shmem_is_huge(inode, 0, false, NULL, 0))
+	if (shmem_huge_global_enabled(inode, 0, false, NULL, 0))
 		stat->blksize = HPAGE_PMD_SIZE;
 
 	if (request_mask & STATX_BTIME) {
@@ -2149,7 +2150,7 @@ static int shmem_get_folio_gfp(struct inode *inode, pgoff_t index,
 		return 0;
 	}
 
-	huge = shmem_is_huge(inode, index, false, fault_mm,
+	huge = shmem_huge_global_enabled(inode, index, false, fault_mm,
 			     vma ? vma->vm_flags : 0);
 	/* Find hugepage orders that are allowed for anonymous shmem. */
 	if (vma && vma_is_anon_shmem(vma))