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BUG: KCSAN: data-race in __filemap_add_folio / nr_blockdev_pages

read-write to 0xffff8881004055c8 of 8 bytes by task 30664 on cpu 1:
 __filemap_add_folio+0x38c/0x720
 filemap_add_folio+0x6f/0x150
 page_cache_ra_unbounded+0x15e/0x2e0
 page_cache_sync_ra+0x251/0x2a0
 filemap_read+0x416/0x1530
 blkdev_read_iter+0x2ca/0x370
 vfs_read+0x39a/0x560
 ksys_read+0xeb/0x1a0
 __x64_sys_read+0x42/0x50
 do_syscall_64+0x41/0xc0
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

read to 0xffff8881004055c8 of 8 bytes by task 12490 on cpu 0:
 nr_blockdev_pages+0x7f/0xd0
 si_meminfo+0x3e/0x60
 update_defense_level+0x43/0x580
 defense_work_handler+0x1f/0x80
 process_one_work+0x3e6/0x750
 worker_thread+0x5ef/0xa10
 kthread+0x1ac/0x1e0
 ret_from_fork+0x1f/0x30

value changed: 0x0000000000000005 -> 0x0000000000000006

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 12490 Comm: kworker/0:9 Not tainted 6.2.0-rc6-syzkaller-00273-g837c07cf68fe-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/12/2023
Workqueue: events_long defense_work_handler
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