arch/um/kernel/mem.c: remove arch_validate()

- Remove arch_validate(), because no one uses it.

- Remove useless macro HAVE_ARCH_VALIDATE.

- Make the variable 'empty_bad_page' static.

Cc: Jeff Dike <jdike@addtoit.com>
Signed-off-by: WANG Cong <wangcong@zeuux.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

2 files changed, 1 insertions, 33 deletions

diff --git a/arch/um/kernel/ksyms.c b/arch/um/kernel/ksyms.c
index ccc02a616c22..836fc9b94707 100644
--- a/arch/um/kernel/ksyms.c
+++ b/arch/um/kernel/ksyms.c
@@ -18,7 +18,6 @@ EXPORT_SYMBOL(get_signals);
 EXPORT_SYMBOL(kernel_thread);
 EXPORT_SYMBOL(sys_waitpid);
 EXPORT_SYMBOL(flush_tlb_range);
-EXPORT_SYMBOL(arch_validate);
 
 EXPORT_SYMBOL(high_physmem);
 EXPORT_SYMBOL(empty_zero_page);
diff --git a/arch/um/kernel/mem.c b/arch/um/kernel/mem.c
index b0ee64622ff7..e2274ef3155d 100644
--- a/arch/um/kernel/mem.c
+++ b/arch/um/kernel/mem.c
@@ -21,7 +21,7 @@
 /* allocated in paging_init, zeroed in mem_init, and unchanged thereafter */
 unsigned long *empty_zero_page = NULL;
 /* allocated in paging_init and unchanged thereafter */
-unsigned long *empty_bad_page = NULL;
+static unsigned long *empty_bad_page = NULL;
 
 /*
  * Initialized during boot, and readonly for initializing page tables
@@ -240,37 +240,6 @@ void __init paging_init(void)
 #endif
 }
 
-struct page *arch_validate(struct page *page, gfp_t mask, int order)
-{
-        unsigned long addr, zero = 0;
-        int i;
-
- again:
-        if (page == NULL)
-                return page;
-        if (PageHighMem(page))
-                return page;
-
-        addr = (unsigned long) page_address(page);
-        for (i = 0; i < (1 << order); i++) {
-                current->thread.fault_addr = (void *) addr;
-                if (__do_copy_to_user((void __user *) addr, &zero,
-                                     sizeof(zero),
-                                     &current->thread.fault_addr,
-                                     &current->thread.fault_catcher)) {
-                        if (!(mask & __GFP_WAIT))
-                                return NULL;
-                        else break;
-                }
-                addr += PAGE_SIZE;
-        }
-
-        if (i == (1 << order))
-                return page;
-        page = alloc_pages(mask, order);
-        goto again;
-}
-
 /*
  * This can't do anything because nothing in the kernel image can be freed
  * since it's not in kernel physical memory.