Re: [PATCH] btrfs: zstd: use spin_lock in timer function

[David Sterba]

On Sat, Apr 09, 2022 at 02:15:23AM +0800, Schspa Shi wrote:
> timer callback was running on bh, and there is no need to disable bh again.

Why do you think so? There was a specific fix fee13fe96529 ("btrfs:
correct zstd workspace manager lock to use spin_lock_bh()") that
actually added the _bh, so either you need to explain why exactly it's
not needed anymore and verify that the reported lockdep warning from the
fix does not happen.