On Wed, 17 Oct 2012, Glauber Costa wrote:

Some flags are used internally by the allocators for management
purposes. One example of that is the CFLGS_OFF_SLAB flag that slab uses
to mark that the metadata for that cache is stored outside of the slab.

No cache should ever pass those as a creation flags. We can just ignore
this bit if it happens to be passed (such as when duplicating a cache in
the kmem memcg patches).

Because such flags can vary from allocator to allocator, we allow them
to make their own decisions on that, defining SLAB_AVAILABLE_FLAGS with
all flags that are valid at creation time.  Allocators that doesn't have
any specific flag requirement should define that to mean all flags.

Common code will mask out all flags not belonging to that set.

[ v2: leave the mask out decision up to the allocators ]
[ v3: define flags for all allocators ]
[ v4: move all definitions to slab.h ]

Signed-off-by: Glauber Costa <redacted>
Acked-by: Christoph Lameter <redacted>
CC: David Rientjes <rientjes@google.com>
CC: Pekka Enberg <redacted>

Acked-by: David Rientjes <rientjes@google.com>

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