switch aio and shm to do_mmap_pgoff(), make do_mmap() static

after all, 0 bytes and 0 pages is the same thing...
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

fs/aio.c

@@ -134,9 +134,9 @@ static int aio_setup_ring(struct kioctx *ctx)
 	info->mmap_size = nr_pages * PAGE_SIZE;
 	dprintk("attempting mmap of %lu bytes\n", info->mmap_size);
 	down_write(&ctx->mm->mmap_sem);
-	info->mmap_base = do_mmap(NULL, 0, info->mmap_size, 
-				  PROT_READ|PROT_WRITE, MAP_ANONYMOUS|MAP_PRIVATE,
-				  0);
+	info->mmap_base = do_mmap_pgoff(NULL, 0, info->mmap_size, 
+					PROT_READ|PROT_WRITE,
+					MAP_ANONYMOUS|MAP_PRIVATE, 0);
 	if (IS_ERR((void *)info->mmap_base)) {
 		up_write(&ctx->mm->mmap_sem);
 		info->mmap_size = 0;

include/linux/mm.h

@@ -1394,7 +1394,7 @@ extern unsigned long get_unmapped_area(struct file *, unsigned long, unsigned lo
 extern unsigned long mmap_region(struct file *file, unsigned long addr,
 	unsigned long len, unsigned long flags,
 	vm_flags_t vm_flags, unsigned long pgoff);
-extern unsigned long do_mmap(struct file *, unsigned long,
+extern unsigned long do_mmap_pgoff(struct file *, unsigned long,
         unsigned long, unsigned long,
         unsigned long, unsigned long);
 extern int do_munmap(struct mm_struct *, unsigned long, size_t);

ipc/shm.c

@@ -1054,7 +1054,7 @@ long do_shmat(int shmid, char __user *shmaddr, int shmflg, ulong *raddr)
 			goto invalid;
 	}
 		
-	user_addr = do_mmap (file, addr, size, prot, flags, 0);
+	user_addr = do_mmap_pgoff(file, addr, size, prot, flags, 0);
 	*raddr = user_addr;
 	err = 0;
 	if (IS_ERR_VALUE(user_addr))

mm/mmap.c

@@ -971,7 +971,7 @@ static inline unsigned long round_hint_to_min(unsigned long hint)
  * The caller must hold down_write(&current->mm->mmap_sem).
  */
 
-static unsigned long do_mmap_pgoff(struct file *file, unsigned long addr,
+unsigned long do_mmap_pgoff(struct file *file, unsigned long addr,
 			unsigned long len, unsigned long prot,
 			unsigned long flags, unsigned long pgoff)
 {
@@ -1102,7 +1102,7 @@ static unsigned long do_mmap_pgoff(struct file *file, unsigned long addr,
 	return mmap_region(file, addr, len, flags, vm_flags, pgoff);
 }
 
-unsigned long do_mmap(struct file *file, unsigned long addr,
+static unsigned long do_mmap(struct file *file, unsigned long addr,
 	unsigned long len, unsigned long prot,
 	unsigned long flag, unsigned long offset)
 {

mm/nommu.c

@@ -1232,7 +1232,7 @@ static int do_mmap_private(struct vm_area_struct *vma,
 /*
  * handle mapping creation for uClinux
  */
-static unsigned long do_mmap_pgoff(struct file *file,
+unsigned long do_mmap_pgoff(struct file *file,
 			    unsigned long addr,
 			    unsigned long len,
 			    unsigned long prot,
@@ -1470,7 +1470,7 @@ static unsigned long do_mmap_pgoff(struct file *file,
 	return -ENOMEM;
 }
 
-unsigned long do_mmap(struct file *file, unsigned long addr,
+static unsigned long do_mmap(struct file *file, unsigned long addr,
 	unsigned long len, unsigned long prot,
 	unsigned long flag, unsigned long offset)
 {