idr-test: Convert ida_check_nomem to new API

We can't move this test to kernel space because there's no way to
force kmalloc to fail.  But we can use the new API and check this
works when the test is in userspace.

Signed-off-by: Matthew Wilcox <willy@infradead.org>

diff --git a/tools/testing/radix-tree/idr-test.c b/tools/testing/radix-tree/idr-test.c
index 604b51dc9b383f2b6a7cba412fb69efeed83d0a6..0f557784327ddbcc6dae344e9821789c26511c4f 100644 (file)
--- a/tools/testing/radix-tree/idr-test.c
+++ b/tools/testing/radix-tree/idr-test.c
@@ -320,19 +320,20 @@ void ida_dump(struct ida *);
 
 /*
  * Check that we get the correct error when we run out of memory doing
- * allocations.  To ensure we run out of memory, just "forget" to preload.
+ * allocations.  In userspace, GFP_NOWAIT will always fail an allocation.
  * The first test is for not having a bitmap available, and the second test
  * is for not being able to allocate a level of the radix tree.
  */
 void ida_check_nomem(void)
 {
        DEFINE_IDA(ida);
-       int id, err;
+       int id;
 
-       err = ida_get_new_above(&ida, 256, &id);
-       assert(err == -EAGAIN);
-       err = ida_get_new_above(&ida, 1UL << 30, &id);
-       assert(err == -EAGAIN);
+       id = ida_alloc_min(&ida, 256, GFP_NOWAIT);
+       IDA_BUG_ON(&ida, id != -ENOMEM);
+       id = ida_alloc_min(&ida, 1UL << 30, GFP_NOWAIT);
+       IDA_BUG_ON(&ida, id != -ENOMEM);
+       IDA_BUG_ON(&ida, !ida_is_empty(&ida));
 }
 
 /*