[RESEND PATCH] arm64: kgdb: fix single stepping

[Jason Wessel]

On 09/16/2016 02:45 AM, Will Deacon wrote:
> On Fri, Sep 16, 2016 at 01:32:19PM +0900, AKASHI Takahiro wrote:
>> On Thu, Sep 15, 2016 at 08:04:57AM -0500, Jason Wessel wrote:
>>> I added the patch to kgdb-next after fixing up the context since it no
>>> longer applied to the mainline (
>>> https://git.kernel.org/cgit/linux/kernel/git/jwessel/kgdb.git/log/?h=kgdb-next).
>>> If there is further discussion on the point above, another patch can be
>>> added, but it I am assuming this is the way you desire it to work as
>>> there are some other architectures that use the same behaviour.  I do
>>> not presently have any ARM64 hardware to validate this particular
>>> change.
>>>
>>> I also added to the patch a "Cc: linux-stable <stable at vger.kernel.org>"
>>> so we can have this appear on some of the older kernels.
>> Since Will asked me to split this patch into a few, I need some reworks
>> to clarify which hunks in the patch are necessary for which version of kernel.
> Yes, splitting the patch would be much better for sorting out the stable
> backports too. Jason, please can you drop the patch for now? I don't mind
> whether the end result goes via arm64 or kgdb, but we should at least both
> agree on it first :)

Splitting it is a very wise idea so that we can have all the -stable kernels patched up with a working single step function.

The separated patches can easily be tagged with the CC line examples as shown below:

Cc: <stable at vger.kernel.org> # 3.15.x-
Cc: <stable at vger.kernel.org> # 4.4
Cc: <stable at vger.kernel.org> # 4.4-4.5

I had dropped the original patch.

Cheers,
Jason.