[PATCH] error code for msync()

SuSv3 says: "The msync() function shall fail if:

[EBUSY]
    Some or all of the addresses in the range starting at addr and
    continuing for len bytes are locked, and MS_INVALIDATE is
    specified.

[EINVAL]
    The value of flags is invalid.

[EINVAL]
    The value of addr is not a multiple of the page size {PAGESIZE}.

[ENOMEM]
    The addresses in the range starting at addr and continuing for len
    bytes are outside the range allowed for the address space of a process
    or specify one or more pages that are not mapped."

This fixes error code of msync() of the EINVAL case.

mm/msync.c

@@ -169,17 +169,18 @@ asmlinkage long sys_msync(unsigned long start, size_t len, int flags)
 {
 	unsigned long end;
 	struct vm_area_struct * vma;
-	int unmapped_error, error = -ENOMEM;
+	int unmapped_error, error = -EINVAL;
 
 	down_read(&current->mm->mmap_sem);
+	if (flags & ~(MS_ASYNC | MS_INVALIDATE | MS_SYNC))
+		goto out;
 	if (start & ~PAGE_MASK)
 		goto out;
+	error = -ENOMEM;
 	len = (len + ~PAGE_MASK) & PAGE_MASK;
 	end = start + len;
 	if (end < start)
 		goto out;
-	if (flags & ~(MS_ASYNC | MS_INVALIDATE | MS_SYNC))
-		goto out;
 	error = 0;
 	if (end == start)
 		goto out;