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From:   Liam Howlett <liam.howlett@oracle.com>
To:     "maple-tree@lists.infradead.org" <maple-tree@lists.infradead.org>,
        "linux-mm@kvack.org" <linux-mm@kvack.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        Andrew Morton <akpm@linux-foundation.org>
Subject: [PATCH v5 03/70] radix tree test suite: Add
 kmem_cache_set_non_kernel()
Thread-Topic: [PATCH v5 03/70] radix tree test suite: Add
 kmem_cache_set_non_kernel()
Thread-Index: AQHYF95wFkWnwXaFrUGUKi2o+PA9QA==
Date:   Wed, 2 Feb 2022 02:41:54 +0000
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From: "Liam R. Howlett" <Liam.Howlett@Oracle.com>

kmem_cache_set_non_kernel() is a mechanism to allow a certain number of
kmem_cache_alloc requests to succeed even when GFP_KERNEL is not set in
the flags.  This functionality allows for testing different paths though
the code.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Liam R. Howlett <Liam.Howlett@Oracle.com>
---
 tools/testing/radix-tree/linux.c | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/tools/testing/radix-tree/linux.c b/tools/testing/radix-tree/li=
nux.c
index 2d9c59df60de..00ee01a14652 100644
--- a/tools/testing/radix-tree/linux.c
+++ b/tools/testing/radix-tree/linux.c
@@ -24,14 +24,24 @@ struct kmem_cache {
 	int nr_objs;
 	void *objs;
 	void (*ctor)(void *);
+	unsigned int non_kernel;
 };
=20
+void kmem_cache_set_non_kernel(struct kmem_cache *cachep, unsigned int val=
)
+{
+	cachep->non_kernel =3D val;
+}
+
 void *kmem_cache_alloc(struct kmem_cache *cachep, int gfp)
 {
 	void *p;
=20
-	if (!(gfp & __GFP_DIRECT_RECLAIM))
-		return NULL;
+	if (!(gfp & __GFP_DIRECT_RECLAIM)) {
+		if (!cachep->non_kernel)
+			return NULL;
+
+		cachep->non_kernel--;
+	}
=20
 	pthread_mutex_lock(&cachep->lock);
 	if (cachep->nr_objs) {
@@ -116,5 +126,6 @@ kmem_cache_create(const char *name, unsigned int size, =
unsigned int align,
 	ret->nr_objs =3D 0;
 	ret->objs =3D NULL;
 	ret->ctor =3D ctor;
+	ret->non_kernel =3D 0;
 	return ret;
 }
--=20
2.34.1