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    Subject[PATCH v14 03/70] radix tree test suite: add kmem_cache_set_non_kernel()
    Date
    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: Liam R. Howlett <Liam.Howlett@Oracle.com>
    Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.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/linux.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;
    };

    +void kmem_cache_set_non_kernel(struct kmem_cache *cachep, unsigned int val)
    +{
    + cachep->non_kernel = val;
    +}
    +
    void *kmem_cache_alloc_lru(struct kmem_cache *cachep, struct list_lru *lru,
    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) {
    @@ -90,5 +101,6 @@ 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;
    }
    --
    2.35.1
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