linux-kernel - [PATCH 04/17] IDR test suite: Check handling negative end correctly

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Date:   Tue, 28 Nov 2017 13:32:59 -0800
From:   Matthew Wilcox <willy@...radead.org>
To:     unlisted-recipients:; (no To-header on input)
Cc:     Matthew Wilcox <mawilcox@...rosoft.com>,
        Chris Mi <chrism@...lanox.com>, Jiri Pirko <jiri@...lanox.com>,
        "David S . Miller" <davem@...emloft.net>,
        Cong Wang <xiyou.wangcong@...il.com>,
        Jamal Hadi Salim <jhs@...atatu.com>,
        Daniel Borkmann <daniel@...earbox.net>,
        Eric Biggers <ebiggers@...gle.com>,
        Lai Jiangshan <laijs@...fujitsu.com>,
        Tejun Heo <tj@...nel.org>, Rehas Sachdeva <aquannie@...il.com>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 04/17] IDR test suite: Check handling negative end correctly

From: Matthew Wilcox <mawilcox@...rosoft.com>

One of the charming quirks of the idr_alloc() interface is that you
can pass a negative end and it will be interpreted as "maximum".  Ensure
we don't break that.

Signed-off-by: Matthew Wilcox <mawilcox@...rosoft.com>
---
 tools/testing/radix-tree/idr-test.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/tools/testing/radix-tree/idr-test.c b/tools/testing/radix-tree/idr-test.c
index 193450b29bf0..892ef8855b02 100644
--- a/tools/testing/radix-tree/idr-test.c
+++ b/tools/testing/radix-tree/idr-test.c
@@ -207,6 +207,7 @@ void idr_checks(void)
 		assert(idr_alloc(&idr, item, i, i + 10, GFP_KERNEL) == i);
 	}
 	assert(idr_alloc(&idr, DUMMY_PTR, i - 2, i, GFP_KERNEL) == -ENOSPC);
+	assert(idr_alloc(&idr, DUMMY_PTR, i - 2, i + 10, GFP_KERNEL) == -ENOSPC);
 
 	idr_for_each(&idr, item_idr_free, &idr);
 	idr_destroy(&idr);
-- 
2.15.0