Re: [tip:perf/uprobes] uprobes, mm, x86: Add the ability to install and remove uprobes breakpoints

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On Tue, 22 May 2012 11:16:18 +1000 Stephen Rothwell <sfr@xxxxxxxxxxxxxxxx> wrote:

> Hi Andrew,
> 
> On Mon, 21 May 2012 15:13:23 -0700 Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> wrote:
> >
> > On Mon, 21 May 2012 15:00:28 -0700
> > Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> wrote:
> > 
> > > On Mon, May 21, 2012 at 2:37 PM, Andrew Morton
> > > <akpm@xxxxxxxxxxxxxxxxxxxx> wrote:
> > > >
> > > > hm, we seem to have conflicting commits between mainline and linux-next.
> > > > During the merge window. __Again. __Nobody knows why this happens.
> > > 
> > > I didn't have my trivial cleanup branches in linux-next, I'm afraid.
> > 
> > Well, it's a broader issue than that.  I often see a large number of
> > rejects when syncing mainline with linux-next during the merge window. 
> > Right now:
> 
> Some of that is because your patch series is based on the end of
> linux-next and part way through the merge window only some of that has
> been merged by Linus.  Also some of it gets rebased before Linus is asked
> to pull (a real pain) - there hasn't been much of that (yet) this merge
> window (but its early days :-().  Also, sometimes Linus' merge
> resolutions are different to mine.
> 
> I have been meaning to talk to you about basing the majority of your
> patch series on Linus' tree.  This would give it mush greater stability
> and would make the merge resolution my problem (and Linus', of course).

Confused.  None of those conflicts have anything to do with the -mm
patches: the only trees involved there are mainline and
trees-in-next-other-than-mm.

> There will be bits that may need to be based on other work in linux-next,
> but I suspect that it is not very much.

Well, there are a number of reasons why I base off linux-next.  To see
whether others have merged patches which I have merged (and, sometimes,
missed later fixes to them).  Explicit fixes against -next material. 
To get visibility into upcoming merge problems.  And so that I and
others test -next too.

Basing -mm on next is never a problem (for me).  What is a problem is
the mess which happens when people merge things into mainline which are
(I assume) either slightly different from what they merged in -next or
which never were in -next at all.

That's guessing - it's a long time since I sat down and worked out exactly
what is causing this.

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