linux-kernel - Re: [PATCH 0/11] introduce down_write_killable for rw

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Date:	Thu, 31 Mar 2016 10:03:31 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	Michal Hocko <mhocko@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	"David S. Miller" <davem@...emloft.net>,
	Tony Luck <tony.luck@...el.com>,
	Chris Zankel <chris@...kel.net>,
	Max Filippov <jcmvbkbc@...il.com>, x86@...nel.org,
	linux-alpha@...r.kernel.org, linux-ia64@...r.kernel.org,
	linux-s390@...r.kernel.org, linux-sh@...r.kernel.org,
	sparclinux@...r.kernel.org, linux-xtensa@...ux-xtensa.org,
	linux-arch@...r.kernel.org
Subject: Re: [PATCH 0/11] introduce down_write_killable for rw_semaphore

On Thu, 31 Mar 2016 11:20:05 +0200 Ingo Molnar <mingo@...nel.org> wrote:

> So AFAIK Andrew's tree is based on top of linux-next

Not really true any more - I only base -mm patches on linux-next
patches when they must be based that way due to some known dependency.

I can certainly handle MM patches which are based on linux-next.  Such
an arrangement is going to make life awkward for Michal's
auto-maintained git tree of the -mm MM patches
(git://git.kernel.org/pub/scm/linux/kernel/git/mhocko/mm.git).

Maybe I could merge down_write_killable into -mm's main MM section then
knock it out of my copy of linux-next, so everything is seamless for
mm.git.  I've done that before.

But it's all a bit of a pain - it would be simpler to keep
down_write_killable in the same tree as the patches which depend on it.

Michal, how about this?

mm.git currently takes the patches between

#NEXT_PATCHES_START mm
...
#NEXT_PATCHES_END

Can you change it to also take the patches between

#NEXT_PATCHES_START mm-post-next
...
#NEXT_PATCHES_END

?

That way I can do

#NEXT_PATCHES_START mm
...
#NEXT_PATCHES_END
...
linux-next.patch
revert-down_write_killable.patch
...
#NEXT_PATCHES_START mm-post-next
down_write_killlable.patch
...
#NEXT_PATCHES_END

then everything you have should apply and run OK.