linux-kernel - [PATCH v7 01/61] radix tree test suite: Check reclaim bit

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Message-Id: <20180219194556.6575-2-willy@infradead.org>
Date:   Mon, 19 Feb 2018 11:44:56 -0800
From:   Matthew Wilcox <willy@...radead.org>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Matthew Wilcox <mawilcox@...rosoft.com>,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        linux-fsdevel@...r.kernel.org
Subject: [PATCH v7 01/61] radix tree test suite: Check reclaim bit

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

In order to test the memory allocation failure paths, the radix tree
test suite fails allocations if __GFP_NOWARN is set.  That happens to work
for the radix tree implementation, but the semantics we really want are
that we want to fail allocations which are not GFP_KERNEL.  Do this
by failing allocations which don't have the DIRECT_RECLAIM bit set.

Signed-off-by: Matthew Wilcox <mawilcox@...rosoft.com>
---
 tools/testing/radix-tree/linux.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/testing/radix-tree/linux.c b/tools/testing/radix-tree/linux.c
index 6903ccf35595..f7f3caed3650 100644
--- a/tools/testing/radix-tree/linux.c
+++ b/tools/testing/radix-tree/linux.c
@@ -29,7 +29,7 @@ void *kmem_cache_alloc(struct kmem_cache *cachep, int flags)
 {
 	struct radix_tree_node *node;
 
-	if (flags & __GFP_NOWARN)
+	if (!(flags & __GFP_DIRECT_RECLAIM))
 		return NULL;
 
 	pthread_mutex_lock(&cachep->lock);
-- 
2.16.1