x86/mm: Drop unused argument 'removed' from sync_global_pgds()

Since commit af2cf27 ("x86/mm/hotplug: Don't remove PGD entries in
remove_pagetable()") there are no callers of sync_global_pgds() which set
the 'removed' argument to 1.

Remove the argument and the related conditionals in the function.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Andy Lutomirski <luto@kernel.org>
Link: http://lkml.kernel.org/r/20161214234403.137556-1-kirill.shutemov@linux.intel.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

arch/x86/include/asm/pgtable_64.h

@@ -116,8 +116,7 @@ static inline void native_pgd_clear(pgd_t *pgd)
 	native_set_pgd(pgd, native_make_pgd(0));
 }
 
-extern void sync_global_pgds(unsigned long start, unsigned long end,
-			     int removed);
+extern void sync_global_pgds(unsigned long start, unsigned long end);
 
 /*
  * Conversion functions: convert a page and protection to a page entry,

arch/x86/mm/fault.c

@@ -413,7 +413,7 @@ static void dump_pagetable(unsigned long address)
 
 void vmalloc_sync_all(void)
 {
-	sync_global_pgds(VMALLOC_START & PGDIR_MASK, VMALLOC_END, 0);
+	sync_global_pgds(VMALLOC_START & PGDIR_MASK, VMALLOC_END);
 }
 
 /*

arch/x86/mm/init_64.c

@@ -89,23 +89,18 @@ static int __init nonx32_setup(char *str)
 __setup("noexec32=", nonx32_setup);
 
 /*
- * When memory was added/removed make sure all the processes MM have
+ * When memory was added make sure all the processes MM have
  * suitable PGD entries in the local PGD level page.
  */
-void sync_global_pgds(unsigned long start, unsigned long end, int removed)
+void sync_global_pgds(unsigned long start, unsigned long end)
 {
 	unsigned long address;
 
 	for (address = start; address <= end; address += PGDIR_SIZE) {
 		const pgd_t *pgd_ref = pgd_offset_k(address);
 		struct page *page;
 
-		/*
-		 * When it is called after memory hot remove, pgd_none()
-		 * returns true. In this case (removed == 1), we must clear
-		 * the PGD entries in the local PGD level page.
-		 */
-		if (pgd_none(*pgd_ref) && !removed)
+		if (pgd_none(*pgd_ref))
 			continue;
 
 		spin_lock(&pgd_lock);
@@ -122,13 +117,8 @@ void sync_global_pgds(unsigned long start, unsigned long end, int removed)
 				BUG_ON(pgd_page_vaddr(*pgd)
 				       != pgd_page_vaddr(*pgd_ref));
 
-			if (removed) {
-				if (pgd_none(*pgd_ref) && !pgd_none(*pgd))
-					pgd_clear(pgd);
-			} else {
-				if (pgd_none(*pgd))
-					set_pgd(pgd, *pgd_ref);
-			}
+			if (pgd_none(*pgd))
+				set_pgd(pgd, *pgd_ref);
 
 			spin_unlock(pgt_lock);
 		}
@@ -596,7 +586,7 @@ kernel_physical_mapping_init(unsigned long paddr_start,
 	}
 
 	if (pgd_changed)
-		sync_global_pgds(vaddr_start, vaddr_end - 1, 0);
+		sync_global_pgds(vaddr_start, vaddr_end - 1);
 
 	__flush_tlb_all();
 
@@ -1239,7 +1229,7 @@ int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node)
 	} else
 		err = vmemmap_populate_basepages(start, end, node);
 	if (!err)
-		sync_global_pgds(start, end - 1, 0);
+		sync_global_pgds(start, end - 1);
 	return err;
 }