bpf: Add necessary migrate_disable to range_tree.

bpf: Add necessary migrate_disable to range_tree.

When running bpf selftest (./test_progs -j), the following warnings
showed up:

  $ ./test_progs -t arena_atomics
  ...
  BUG: using smp_processor_id() in preemptible [00000000] code: kworker/u19:0/12501
  caller is bpf_mem_free+0x128/0x330
  ...
  Call Trace:
   <TASK>
   dump_stack_lvl
   check_preemption_disabled
   bpf_mem_free
   range_tree_destroy
   arena_map_free
   bpf_map_free_deferred
   process_scheduled_works
   ...

For selftests arena_htab and arena_list, similar smp_process_id() BUGs are
dumped, and the following are two stack trace:

   <TASK>
   dump_stack_lvl
   check_preemption_disabled
   bpf_mem_alloc
   range_tree_set
   arena_map_alloc
   map_create
   ...

   <TASK>
   dump_stack_lvl
   check_preemption_disabled
   bpf_mem_alloc
   range_tree_clear
   arena_vm_fault
   do_pte_missing
   handle_mm_fault
   do_user_addr_fault
   ...

Add migrate_{disable,enable}() around related bpf_mem_{alloc,free}()
calls to fix the issue.

Fixes: b795379757eb ("bpf: Introduce range_tree data structure and use it in bpf arena")
Signed-off-by: Yonghong Song <yonghong.song@linux.dev>
Link: https://lore.kernel.org/r/20241115060354.2832495-1-yonghong.song@linux.dev
Signed-off-by: Alexei Starovoitov <ast@kernel.org>