idr test suite: Fix ida_test_random()

Web:        https://git.kernel.org/torvalds/c/490645d027c5925b30c88b9c7a663850a641d15d
Commit:     490645d027c5925b30c88b9c7a663850a641d15d
Parent:     051803c0d01f4d8a197ecc08bfeffdff00d86c62
Refname:    refs/heads/master
Author:     Matthew Wilcox <[email protected]>
AuthorDate: Thu Nov 9 20:15:14 2017 -0500
Committer:  Matthew Wilcox <[email protected]>
CommitDate: Tue Feb 6 15:07:20 2018 -0500

    idr test suite: Fix ida_test_random()
    
    The test was checking the wrong errno; ida_get_new_above() returns
    EAGAIN, not ENOMEM on memory allocation failure.  Double the number of
    threads to increase the chance that we actually exercise this path
    during the test suite (it was a bit sporadic before).
    
    Signed-off-by: Matthew Wilcox <[email protected]>
---
 tools/testing/radix-tree/idr-test.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/testing/radix-tree/idr-test.c b/tools/testing/radix-tree/idr-test.c
index 30cd0b296f1a..193450b29bf0 100644
--- a/tools/testing/radix-tree/idr-test.c
+++ b/tools/testing/radix-tree/idr-test.c
@@ -380,7 +380,7 @@ void ida_check_random(void)
 			do {
 				ida_pre_get(&ida, GFP_KERNEL);
 				err = ida_get_new_above(&ida, bit, &id);
-			} while (err == -ENOMEM);
+			} while (err == -EAGAIN);
 			assert(!err);
 			assert(id == bit);
 		}
@@ -489,7 +489,7 @@ static void *ida_random_fn(void *arg)
 
 void ida_thread_tests(void)
 {
-	pthread_t threads[10];
+	pthread_t threads[20];
 	int i;
 
 	for (i = 0; i < ARRAY_SIZE(threads); i++)
--
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