bpf: Add schedule points in batch ops

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: bpf: Add schedule points in batch ops syzbot reported various soft lockups caused by bpf batch operations. INFO: task kworker/1:1:27 blocked for more than 140 seconds. INFO: task hung in rcu_barrier Nothing prevents batch ops to process huge amount of data, we need to add schedule points in them. Note that maybe_wait_bpf_programs(map) calls from generic_map_delete_batch() can be factorized by moving the call after the loop. This will be done later in -next tree once we get this fix merged, unless there is strong opinion doing this optimization sooner.

References

• https://git.kernel.org/stable/c/7ef94bfb08fb9e73defafbd5ddef6b5a0e2ee12b
• https://git.kernel.org/stable/c/8628f489b749a4f9767991631921dbe3fbcdc784
• https://git.kernel.org/stable/c/7e8099967d0e3ff9d1ae043e80b27fbe46c08417
• https://git.kernel.org/stable/c/75134f16e7dd0007aa474b281935c5f42e79f2c8