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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>,
        Yu Zhao <yuzhao@google.com>, Hugh Dickins <hughd@google.com>
Subject: [PATCH v11 03/69] radix tree test suite: add
 kmem_cache_set_non_kernel()
Thread-Topic: [PATCH v11 03/69] radix tree test suite: add
 kmem_cache_set_non_kernel()
Thread-Index: AQHYmYdtEhbaUTvcm0SDUzUK1Ot0Wg==
Date:   Sun, 17 Jul 2022 02:46:33 +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.

Link: https://lkml.kernel.org/r/20220504010716.661115-5-Liam.Howlett@oracle=
.com
Link: https://lkml.kernel.org/r/20220621204632.3370049-4-Liam.Howlett@oracl=
e.com
Signed-off-by: Liam R. Howlett <Liam.Howlett@Oracle.com>
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: David Howells <dhowells@redhat.com>
Cc: SeongJae Park <sj@kernel.org>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Will Deacon <will@kernel.org>
Cc: Davidlohr Bueso <dave@stgolabs.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
 tools/testing/radix-tree/linux.c | 16 ++++++++++++++--
 1 file changed, 14 insertions(+), 2 deletions(-)

diff --git a/tools/testing/radix-tree/linux.c b/tools/testing/radix-tree/li=
nux.c
index d5c1bcba86fe..277aa8b70abc 100644
--- a/tools/testing/radix-tree/linux.c
+++ b/tools/testing/radix-tree/linux.c
@@ -23,15 +23,26 @@ 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_lru(struct kmem_cache *cachep, struct list_lru *lru=
,
 		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) {
@@ -90,5 +101,6 @@ kmem_cache_create(const char *name, unsigned int size, u=
nsigned int align,
 	ret->nr_objs =3D 0;
 	ret->objs =3D NULL;
 	ret->ctor =3D ctor;
+	ret->non_kernel =3D 0;
 	return ret;
 }
--=20
2.35.1