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Date: Thu, 12 Nov 2020 19:40:47 -0800 From: Andrew Morton <akpm@...ux-foundation.org> To: Alexei Starovoitov <alexei.starovoitov@...il.com> Cc: Roman Gushchin <guro@...com>, Stephen Rothwell <sfr@...b.auug.org.au>, bpf <bpf@...r.kernel.org>, Alexei Starovoitov <ast@...nel.org>, Daniel Borkmann <daniel@...earbox.net>, Network Development <netdev@...r.kernel.org>, Andrii Nakryiko <andrii@...nel.org>, Shakeel Butt <shakeelb@...gle.com>, linux-mm <linux-mm@...ck.org>, LKML <linux-kernel@...r.kernel.org>, Kernel Team <kernel-team@...com>, Johannes Weiner <hannes@...xchg.org>, Michal Hocko <mhocko@...e.com> Subject: Re: [PATCH bpf-next v5 01/34] mm: memcontrol: use helpers to read page's memcg data On Thu, 12 Nov 2020 19:25:48 -0800 Alexei Starovoitov <alexei.starovoitov@...il.com> wrote: > On Thu, Nov 12, 2020 at 7:18 PM Andrew Morton <akpm@...ux-foundation.org> wrote: > > > > On Thu, 12 Nov 2020 19:04:56 -0800 Alexei Starovoitov <alexei.starovoitov@...il.com> wrote: > > > > > On Thu, Nov 12, 2020 at 04:26:10PM -0800, Roman Gushchin wrote: > > > > > > > > These patches are not intended to be merged through the bpf tree. > > > > They are included into the patchset to make bpf selftests pass and for > > > > informational purposes. > > > > It's written in the cover letter. > > > ... > > > > Maybe I had to just list their titles in the cover letter. Idk what's > > > > the best option for such cross-subsystem dependencies. > > > > > > We had several situations in the past releases where dependent patches > > > were merged into multiple trees. For that to happen cleanly from git pov > > > one of the maintainers need to create a stable branch/tag and let other > > > maintainers pull that branch into different trees. This way the sha-s > > > stay the same and no conflicts arise during the merge window. > > > In this case sounds like the first 4 patches are in mm tree already. > > > Is there a branch/tag I can pull to get the first 4 into bpf-next? > > > > Not really, at present. This is largely by design, although it does cause > > this problem once or twice a year. > > > > These four patches: > > > > mm-memcontrol-use-helpers-to-read-pages-memcg-data.patch > > mm-memcontrol-slab-use-helpers-to-access-slab-pages-memcg_data.patch > > mm-introduce-page-memcg-flags.patch > > mm-convert-page-kmemcg-type-to-a-page-memcg-flag.patch > > > > are sufficiently reviewed - please pull them into the bpf tree when > > convenient. Once they hit linux-next, I'll drop the -mm copies and the > > bpf tree maintainers will then be responsible for whether & when they > > get upstream. > > That's certainly an option if they don't depend on other patches in the mm tree. > Roman probably knows best ? That should be OK. They apply and compile ;)
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