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idr test suite: Create anchor before launching throbber

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[ Upstream commit 094ffbd1d8eaa27ed426feb8530cb1456348b018 ]

The throbber could race with creation of the anchor entry and cause the
IDR to have zero entries in it, which would cause the test to fail.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Matthew Wilcox (Oracle) 2021-04-01 07:46:49 -04:00 committed by Greg Kroah-Hartman
parent 9a7552daa9
commit b1f6c6f39b
1 changed files with 2 additions and 2 deletions
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4
tools/testing/radix-tree/idr-test.c
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@ -301,11 +301,11 @@ void idr_find_test_1(int anchor_id, int throbber_id)
pthread_t throbber;
time_t start = time(NULL);
pthread_create(&throbber, NULL, idr_throbber, &throbber_id);
BUG_ON(idr_alloc(&find_idr, xa_mk_value(anchor_id), anchor_id,
anchor_id + 1, GFP_KERNEL) != anchor_id);
pthread_create(&throbber, NULL, idr_throbber, &throbber_id);
rcu_read_lock();
do {
int id = 0;