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From: Greg KH <gregkh@linuxfoundation.org>
Subject: Re: [commit cbf76b702] bcache: Really show state of work pending bit
To: Eric Wheeler <stable@linux.ewheeler.net>
Cc: <stable@vger.kernel.org>
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On Fri, Feb 26, 2016 at 05:34:19PM -0800, Eric Wheeler wrote:
> To whom it may concern:
> 
> Please flag commit cbf76b702 for inclusion into stable branches.  It 
> applies cleanly in 4.1 (and likely 3.18).  We have been testing it for a 
> while.
> 
> git diff --stat cbf76b702~1..cbf76b702
>  drivers/md/bcache/closure.c | 4 +---
>  1 file changed, 1 insertion(+), 3 deletions(-)
> 
> Thank you!

$ git show cbf76b702
fatal: ambiguous argument 'cbf76b702': unknown revision or path not in the working tree.

You are going to have to be a bit more specific...