cgroup/cpuset: Remove cpuset_do_slab_mem_spread()

The SLAB allocator has been removed sine 6.8-rc1 [1], so there is no user
with SLAB_MEM_SPREAD and cpuset_do_slab_mem_spread(). Then SLAB_MEM_SPREAD
is marked as unused by [2]. Here we can remove
cpuset_do_slab_mem_spread(). For more details, please check [3].

[1] https://lore.kernel.org/linux-mm/[email protected]/
[2] https://lore.kernel.org/linux-kernel/[email protected]/T/
[3] https://lore.kernel.org/lkml/[email protected]/T/#mf14b838c5e0e77f4756d436bac3d8c0447ea4350

Signed-off-by: Xiongwei Song <[email protected]>
Reviewed-by: Waiman Long <[email protected]>
Signed-off-by: Tejun Heo <[email protected]>

Author: Xiongwei Song

include/linux/cpuset.h

@@ -121,11 +121,6 @@ static inline int cpuset_do_page_mem_spread(void)
 	return task_spread_page(current);
 }
 
-static inline int cpuset_do_slab_mem_spread(void)
-{
-	return task_spread_slab(current);
-}
-
 extern bool current_cpuset_is_being_rebound(void);
 
 extern void rebuild_sched_domains(void);
@@ -264,11 +259,6 @@ static inline int cpuset_do_page_mem_spread(void)
 	return 0;
 }
 
-static inline int cpuset_do_slab_mem_spread(void)
-{
-	return 0;
-}
-
 static inline bool current_cpuset_is_being_rebound(void)
 {
 	return false;