[BUG] blk-throttle panic on 32bit machine after startup

Hi,

I ran into a kernel bug related to blk-throttle on CentOS 7 AltArch for i386.
Userspace programs may panic the kernel if they hit the I/O limit
within 5 minutes after startup.

Root cause:
1. jiffies was initialized to -300HZ during boot on 32bit machines
2. enable blkio cgroup hierarchy
   __DEVEL__sane_behavior for cgroup v1 or default hierarchy for cgroup v2
   EL7 kernel modified throtl_pd_init and always enable hierarchical throttling
3. enable & trigger blkio throttling within 5 minutes after startup
   bio propagated from child tg to parent
4. enter throtl_start_new_slice_with_credit
   if(time_after_eq(start, tg->slice_start[rw]))
   aka. time_after_eq(0xFFFxxxxx, 0) does not hold
   parent tg->slice_start[rw] was zero-initialized and not updated
5. enter throtl_trim_slice
   BUG_ON(time_before(tg->slice_end[rw], tg->slice_start[rw]))
   aka. time_before(0xFFFxxxxx, 0) triggers a panic

Reproducer: (tested on Alpine Linux x86 kernel 5.10.X)
#!/bin/sh
CGROUP_PATH="$(mktemp -d)"
mount -t cgroup2 none "$CGROUP_PATH"
echo +io >"$CGROUP_PATH/cgroup.subtree_control"
mkdir "$CGROUP_PATH/child"
echo "7:0 riops=2" >"$CGROUP_PATH/child/io.max"
echo 0 >"$CGROUP_PATH/child/cgroup.procs"
echo 3 >/proc/sys/vm/drop_caches
dd if=/dev/loop0 of=/dev/null count=3