Re: FAILED: patch "[PATCH] bcache: Revert "bcache: use sysfs_match_string() instead of" failed to apply to 5.2-stable tree

[Greg KH <gregkh@linuxfoundation.org>]

On Sun, Aug 11, 2019 at 11:41:57PM +0800, Coly Li wrote:
> On 2019/8/11 11:01 下午, gregkh@linuxfoundation.org wrote:
> > 
> > The patch below does not apply to the 5.2-stable tree.
> > If someone wants it applied there, or to any other stable or longterm
> > tree, then please email the backport, including the original git commit
> > id to <stable@vger.kernel.org>.
> > 
> > thanks,
> > 
> > greg k-h
> 
> Hi Greg,
> 
> I will post a rebased patch for the 5.2-stable tree.

Is it really needed?

I ask because in the patch it says:

> > This bug was introduced in Linux v5.2, so this fix only applies to
> > Linux v5.2 is enough for stable tree maintainer.
> > 
> > Fixes: 89e0341af082 ("bcache: use sysfs_match_string() instead of __sysfs_match_string()")

But commit 89e0341af082 showed up in 5.3-rc1, not 5.2.

So why is this needed in 5.2.y?

thanks,

greg k-h