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Message-ID: <20220215144241.3812052-4-Liam.Howlett@oracle.com>
Date: Tue, 15 Feb 2022 14:42:57 +0000
From: Liam Howlett <liam.howlett@...cle.com>
To: "maple-tree@...ts.infradead.org" <maple-tree@...ts.infradead.org>,
"linux-mm@...ck.org" <linux-mm@...ck.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
Andrew Morton <akpm@...ux-foundation.org>
Subject: [PATCH v6 04/71] radix tree test suite: Add
kmem_cache_set_non_kernel()
From: "Liam R. Howlett" <Liam.Howlett@...cle.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@...radead.org>
Signed-off-by: Liam R. Howlett <Liam.Howlett@...cle.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/linux.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;
};
+void kmem_cache_set_non_kernel(struct kmem_cache *cachep, unsigned int val)
+{
+ cachep->non_kernel = val;
+}
+
void *kmem_cache_alloc(struct kmem_cache *cachep, int gfp)
{
void *p;
- if (!(gfp & __GFP_DIRECT_RECLAIM))
- return NULL;
+ if (!(gfp & __GFP_DIRECT_RECLAIM)) {
+ if (!cachep->non_kernel)
+ return NULL;
+
+ cachep->non_kernel--;
+ }
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 = 0;
ret->objs = NULL;
ret->ctor = ctor;
+ ret->non_kernel = 0;
return ret;
}
--
2.34.1
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