Re: [PATCH 06/12] btrfs: change lockdep class size check using ks->names

[David Sterba]

On Tue, Feb 08, 2022 at 10:42:02AM -0800, Namhyung Kim wrote:
> With upcoming lock tracepoints config, it'd allow some lockdep
> annotation code without enabling CONFIG_LOCKDEP actually.  In that
> config, size of the struct lock_class_key would be 0.
> 
> But it'd cause divide-by-zero in btrfs_set_buffer_lockdep_class() due
> to ARRAY_SIZE macro.  Let's change it to use ks->names[] instead.  It
> should have the same size as with ks->keys[].
> 
> Cc: Chris Mason <clm@xxxxxx>
> Cc: Josef Bacik <josef@xxxxxxxxxxxxxx>
> Cc: David Sterba <dsterba@xxxxxxxx>
> Cc: linux-btrfs@xxxxxxxxxxxxxxx
> Signed-off-by: Namhyung Kim <namhyung@xxxxxxxxxx>

Acked-by: David Sterba <dsterba@xxxxxxxx>