x86: remove now unused clear_kernel_mapping

Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
index b7a7992c28b65e6347b2180e3db7df642181bfbe..5855449ce7aac4ced1e756d2b3a5429172f0039b 100644 (file)
--- a/arch/x86/mm/init_64.c
+++ b/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
  */

diff --git a/include/asm-x86/pgtable_64.h b/include/asm-x86/pgtable_64.h
index 6e615a103c2ff485fdd59b18b081243325baf114..5c86cff3ee79f314d8e6d2f3af542522d815dee8 100644 (file)
--- a/include/asm-x86/pgtable_64.h
+++ b/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__ */