[PATCH v2 0/3] arm64: kgdb: fix single stepping

[Greg KH]

On Fri, Sep 23, 2016 at 06:27:07PM +0900, AKASHI Takahiro wrote:
> On Fri, Sep 23, 2016 at 10:43:41AM +0200, Greg KH wrote:
> > On Fri, Sep 23, 2016 at 05:32:58PM +0900, AKASHI Takahiro wrote:
> > > On Fri, Sep 23, 2016 at 10:16:18AM +0200, Greg KH wrote:
> > > > On Fri, Sep 23, 2016 at 04:33:24PM +0900, AKASHI Takahiro wrote:
> > > > > Kgdb support on arm64 was merged in v3.15, but from its first appearance,
> > > > > "signle step" has never worked well.
> > > > > 
> > > > > This patch fixes all the error cases I found so far.
> > > > > The original patch[1] was splitted into three pieces, ones for each case.
> > > > > patch#1, #2 should be applied to all the version, v3.15 and later.
> > > > > pathc#3 only for v3.16 and later.
> > > > 
> > > > As this is not a regression (i.e. it has never worked), why is this
> > > > something for stable releases?
> > > 
> > > Because, I think, that is a bug.
> > > The author seems to have believed that it worked.
> > > Please see:
> > >   commit 44679a4f
> > >   Author: Vijaya Kumar K <Vijaya.Kumar at caviumnetworks.com>
> > >   Date:   Tue Jan 28 11:20:19 2014 +0000
> > > 
> > >       arm64: KGDB: Add step debugging support
> > 
> > Yes, but again, it didn't work, so this would be a new feature.
> 
> Yes, but again, it's a bug of kgdb on arm64 which is supposed
> to have been available since v3.15.

But it wasn't ever working, so it's not a regression or a bugfix, sorry.

> > Please read Documentation/stable_kernel_rules.txt for the requirements
> > of a stable kernel patch.  I don't think this series meets those rules.
> 
> Please re-think about merging this patch.

It's not even in Linus's tree yet, so there's nothing for me to merge
anywhere.

thanks,

greg k-h