Mention that when a part of a slab cache might be exported to the userspace, the cache should be created using kmem_cache_create_usercopy() Signed-off-by: Mike Rapoport <rppt@xxxxxxxxxxxxx> --- Documentation/core-api/memory-allocation.rst | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) diff --git a/Documentation/core-api/memory-allocation.rst b/Documentation/core-api/memory-allocation.rst index 8954a88..51a200d 100644 --- a/Documentation/core-api/memory-allocation.rst +++ b/Documentation/core-api/memory-allocation.rst @@ -113,9 +113,11 @@ see :c:func:`kvmalloc_node` reference documentation. Note that If you need to allocate many identical objects you can use the slab cache allocator. The cache should be set up with -:c:func:`kmem_cache_create` before it can be used. Afterwards -:c:func:`kmem_cache_alloc` and its convenience wrappers can allocate -memory from that cache. +:c:func:`kmem_cache_create` or :c:func:`kmem_cache_create_usercopy` +before it can be used. The second function should be used if a part of +the cache might be copied to the userspace. After the cache is +created :c:func:`kmem_cache_alloc` and its convenience wrappers can +allocate memory from that cache. When the allocated memory is no longer needed it must be freed. You can use :c:func:`kvfree` for the memory allocated with `kmalloc`, -- 2.7.4
