x86: remove now unused clear_kernel_mapping

Signed-off-by: NAndi Kleen <ak@suse.de>
Signed-off-by: NIngo Molnar <mingo@elte.hu>
Signed-off-by: NThomas Gleixner <tglx@linutronix.de>

arch/x86/mm/init_64.c

@@ -434,49 +434,6 @@ void __init paging_init(void)
 }
 #endif
 
-/*
- * Unmap a kernel mapping if it exists. This is useful to avoid
- * prefetches from the CPU leading to inconsistent cache lines.
- * address and size must be aligned to 2MB boundaries.
- * Does nothing when the mapping doesn't exist.
- */
-void __init clear_kernel_mapping(unsigned long address, unsigned long size)
-{
-	unsigned long end = address + size;
-
-	BUG_ON(address & ~PMD_PAGE_MASK);
-	BUG_ON(size & ~PMD_PAGE_MASK);
-
-	for (; address < end; address += PMD_PAGE_SIZE) {
-		pgd_t *pgd = pgd_offset_k(address);
-		pud_t *pud;
-		pmd_t *pmd;
-
-		if (pgd_none(*pgd))
-			continue;
-
-		pud = pud_offset(pgd, address);
-		if (pud_none(*pud))
-			continue;
-
-		pmd = pmd_offset(pud, address);
-		if (!pmd || pmd_none(*pmd))
-			continue;
-
-		if (!(pmd_val(*pmd) & _PAGE_PSE)) {
-			/*
-			 * Could handle this, but it should not happen
-			 * currently:
-			 */
-			printk(KERN_ERR "clear_kernel_mapping: "
-				"mapping has been split. will leak memory\n");
-			pmd_ERROR(*pmd);
-		}
-		set_pmd(pmd, __pmd(0));
-	}
-	__flush_tlb_all();
-}
-
 /*
  * Memory hotplug specific functions
  */

include/asm-x86/pgtable_64.h

@@ -21,7 +21,6 @@ extern pgd_t init_level4_pgt[];
 #define swapper_pg_dir init_level4_pgt
 
 extern void paging_init(void);
-extern void clear_kernel_mapping(unsigned long addr, unsigned long size);
 
 #endif /* !__ASSEMBLY__ */