On Fri, Oct 30, 2015 at 08:56:33AM +0800, Boqun Feng wrote:

On Tue, Oct 27, 2015 at 11:06:52AM +0800, Boqun Feng wrote:

quoted

On Tue, Oct 27, 2015 at 01:33:47PM +1100, Michael Ellerman wrote:

quoted

On Mon, 2015-26-10 at 10:15:36 UTC, Boqun Feng wrote:

quoted

This patch fixes two problems to make value-returning atomics and
{cmp}xchg fully ordered on PPC.

Hi Boqun,

Can you please split this into two patches. One that does the cmpxchg change
and one that changes PPC_ATOMIC_ENTRY_BARRIER.

OK, make sense ;-)

quoted

Also given how pervasive this change is I'd like to take it via the powerpc
next tree, so can you please send this patch (which will be two after you split
it) as powerpc patches. And the rest can go via tip?

One problem is that patch 5 will remove __xchg_u32 and __xchg_64
entirely, which are modified in this patch(patch 1), so there will be
some conflicts if two branch get merged, I think.

Alternative way is that all this series go to powerpc next tree as most
of the dependent patches are already there. I just need to remove
inc/dec related code and resend them when appropriate. Besides, I can
pull patch 2 out and send it as a tip patch because it's general code
and no one depends on this in this series.

To summerize:

patch 1(split to two), 3, 4(remove inc/dec implementation), 5, 6 sent as
powerpc patches for powerpc next, patch 2(unmodified) sent as tip patch
for locking/core.

Peter and Michael, this works for you both?

Thoughts? ;-)

Peter and Michael, I will split patch 1 to two and send them as patches
for powerpc next first. The rest of this can wait util we are on the
same page of where they'd better go.

Regards,
Boqun