binder: fix sparse issue in binder_alloc_selftest.c

Fixes sparse issues reported by the kbuild test robot running
on https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc.git
char-misc-testing: bde4a19fc04f5 ("binder: use userspace pointer as base
of buffer space")

Error output (drivers/android/binder_alloc_selftest.c):
sparse: warning: incorrect type in assignment (different address spaces)
sparse:    expected void *page_addr
sparse:    got void [noderef] <asn:1> *user_data
sparse: error: subtraction of different types can't work

Fixed by adding necessary "__user" tags.

Reported-by: kbuild test robot <lkp@intel.com>
Signed-off-by: Todd Kjos <tkjos@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/android/binder_alloc_selftest.c b/drivers/android/binder_alloc_selftest.c
index f0f4d7d..b727089 100644 (file)
--- a/drivers/android/binder_alloc_selftest.c
+++ b/drivers/android/binder_alloc_selftest.c
@@ -102,10 +102,11 @@ static bool check_buffer_pages_allocated(struct binder_alloc *alloc,
                                         struct binder_buffer *buffer,
                                         size_t size)
 {
-       void *page_addr, *end;
+       void __user *page_addr;
+       void __user *end;
        int page_index;
 
-       end = (void *)PAGE_ALIGN((uintptr_t)buffer->user_data + size);
+       end = (void __user *)PAGE_ALIGN((uintptr_t)buffer->user_data + size);
        page_addr = buffer->user_data;
        for (; page_addr < end; page_addr += PAGE_SIZE) {
                page_index = (page_addr - alloc->buffer) / PAGE_SIZE;