From: Matthew Wilcox <willy@infradead.org>
Date: Tue, 5 Feb 2019 04:12:08 +0000 (-0500)
Subject: XArray tests: RCU lock prohibits GFP_KERNEL
X-Git-Tag: v5.1-rc1~58^2~10
X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=commitdiff_plain;h=bd54211b8e199ffb701ec98bf4f301e4a6f38a92;p=linux.git

XArray tests: RCU lock prohibits GFP_KERNEL

Drop and reacquire the RCU read lock while using GFP_KERNEL.

Reported-by: Li RongQing <lirongqing@baidu.com>
Signed-off-by: Matthew Wilcox <willy@infradead.org>
---

diff --git a/lib/test_xarray.c b/lib/test_xarray.c
index c596a957f764..671a93ee09e6 100644
--- a/lib/test_xarray.c
+++ b/lib/test_xarray.c
@@ -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));