arm: add arch_mmap_check(), get rid of sys_arm_mremap()

Acked-by: Russell King <[e-mail]>
Signed-off-by: Al Viro <[e-mail]>

arch/arm/include/asm/mman.h

···
 #include <asm-generic/mman.h>
+
+#define arch_mmap_check(addr, len, flags) \
+	(((flags) & MAP_FIXED && (addr) < FIRST_USER_ADDRESS) ? -EINVAL : 0)

arch/arm/kernel/calls.S

···
 /* 160 */	CALL(sys_sched_get_priority_min)
 		CALL(sys_sched_rr_get_interval)
 		CALL(sys_nanosleep)
-		CALL(sys_arm_mremap)
+		CALL(sys_mremap)
 		CALL(sys_setresuid16)
 /* 165 */	CALL(sys_getresuid16)
 		CALL(sys_ni_syscall)		/* vm86 */

arch/arm/kernel/sys_arm.c

···
 #include <linux/ipc.h>
 #include <linux/uaccess.h>
 
-extern unsigned long do_mremap(unsigned long addr, unsigned long old_len,
-			       unsigned long new_len, unsigned long flags,
-			       unsigned long new_addr);
-
 /* common code for old and new mmaps */
 inline long do_mmap2(
 	unsigned long addr, unsigned long len,
···
 	struct file * file = NULL;
 
 	flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
-
-	if (flags & MAP_FIXED && addr < FIRST_USER_ADDRESS)
-		goto out;
 
 	error = -EBADF;
 	if (!(flags & MAP_ANONYMOUS)) {
···
 	error = do_mmap2(a.addr, a.len, a.prot, a.flags, a.fd, a.offset >> PAGE_SHIFT);
 out:
 	return error;
-}
-
-asmlinkage unsigned long
-sys_arm_mremap(unsigned long addr, unsigned long old_len,
-	       unsigned long new_len, unsigned long flags,
-	       unsigned long new_addr)
-{
-	unsigned long ret = -EINVAL;
-
-	if (flags & MREMAP_FIXED && new_addr < FIRST_USER_ADDRESS)
-		goto out;
-
-	down_write(&current->mm->mmap_sem);
-	ret = do_mremap(addr, old_len, new_len, flags, new_addr);
-	up_write(&current->mm->mmap_sem);
-
-out:
-	return ret;
 }
 
 /*