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Commit bd54211b authored by Matthew Wilcox's avatar Matthew Wilcox
Browse files

XArray tests: RCU lock prohibits GFP_KERNEL 



Drop and reacquire the RCU read lock while using GFP_KERNEL.

Reported-by: default avatarLi RongQing <lirongqing@baidu.com>
Signed-off-by: default avatarMatthew Wilcox <willy@infradead.org>
parent 8834f560

lib/test_xarray.c

+3 −0
Original line number Diff line number Diff line
@@ -107,8 +107,11 @@ static noinline void check_xas_retry(struct xarray *xa) 
	XA_BUG_ON(xa, xas.xa_node != XAS_RESTART);

	XA_BUG_ON(xa, xas_next_entry(&xas, ULONG_MAX) != xa_mk_value(0));

	XA_BUG_ON(xa, xas.xa_node != NULL);

	rcu_read_unlock();



	XA_BUG_ON(xa, xa_store_index(xa, 1, GFP_KERNEL) != NULL);



	rcu_read_lock();

	XA_BUG_ON(xa, !xa_is_internal(xas_reload(&xas)));

	xas.xa_node = XAS_RESTART;

	XA_BUG_ON(xa, xas_next_entry(&xas, ULONG_MAX) != xa_mk_value(0));