PSA: kernel 5.12.11 is safe for bcache, again

With the release of Linux kernel 5.12.11, bcache is safe to use, again. The patch bcache: avoid oversized read request in cache missing code path has been merged.

Due to changes in 5.12 kernels, bcache was prone to cause a BUG_ON() when submitting large I/O requests. The result was a kernel panic or a system freeze. Problem was reported in couple of places: Fedora bug#1965809, bcache mailing list #1, bcache mailing list #2.