mm, slab: use an enum to define SLAB_ cache creation flags

The values of SLAB_ cache creation flags are defined by hand, which is
tedious and error-prone. Use an enum to assign the bit number and a
__SLAB_FLAG_BIT() macro to #define the final flags.

This renumbers the flag values, which is OK as they are only used
internally.

Also define a __SLAB_FLAG_UNUSED macro to assign value to flags disabled
by their respective config options in a unified and sparse-friendly way.

Reviewed-and-tested-by: Xiongwei Song <[email protected]>
Reviewed-by: Chengming Zhou <[email protected]>
Reviewed-by: Roman Gushchin <[email protected]>
Acked-by: David Rientjes <[email protected]>
Signed-off-by: Vlastimil Babka <[email protected]>

0 files changed, 0 insertions, 0 deletions